def new_star_code_phigrape(self):
     result = PhiGRAPE(self.converter, mode="gpu")
     result.parameters.initialize_gpu_once = 1
     result.parameters.epsilon_squared = self.star_epsilon ** 2
     result.particles.add_particles(self.new_particles_cluster())
     result.commit_particles()
     return result
Exemple #2
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 def test10(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     stars = new_plummer_model(100)
     stars.radius = 0 | nbody_system.length
     
     instance.particles.add_particles(stars)
     channel = stars.new_channel_to(instance.particles)
     
     instance.evolve_model(0.001 | nbody_system.time)
 
     e0 = instance.kinetic_energy + instance.potential_energy
     
     stars.mass *= 0.9
     channel.copy()
     
     instance.synchronize_model()
     
     e1 = instance.kinetic_energy + instance.potential_energy
     
     delta_e = e1 - e0
     
     self.assertTrue(e1 != e0)
     
     instance.stop()
Exemple #3
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 def test7(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(2)
     particles.mass = [1.0, 1.0] | nbody_system.mass
     particles.radius =  [0.0001, 0.0001] | nbody_system.length
     particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
     particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     
     instance.commit_particles()
     
     zero = [0.0, 0.0, 0.0] | nbody_system.length
     fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
     self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
     self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
     self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)
     
     n = 512
     x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
     zero = nbody_system.length.new_quantity(numpy.zeros(n))
     fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
     for i in range(n//2):
         self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)
     
     instance.stop()
    def test19(self):
        converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.parsec)
        
        particles = datamodel.Particles(2)
        particles.mass = 100 | units.MSun
        particles.radius = 200 | units.RSun
        particles[0].position = [0,0,0] | units.parsec
        particles[1].position = [1,0,0] | units.parsec
        particles.velocity = [0,0,0] |  units.km / units.s


        code = PhiGRAPE(
            converter, 
            PhiGRAPEInterface.MODE_G6LIB,
            number_of_workers=2
        )
        code.initialize_code()
        stop_cond = code.stopping_conditions.collision_detection
        stop_cond.enable()
       
        code.particles.add_particles(particles)

        code.evolve_model( 0.08 | nbody_system.time)
        
        self.assertTrue(stop_cond.is_set())
 def new_star_code_phigrape(self):
     result = PhiGRAPE(mode="gpu")
     result.parameters.initialize_gpu_once = 1
     result.parameters.epsilon_squared = self.star_epsilon**2
     result.particles.add_particles(self.new_particles_cluster())
     result.commit_particles()
     return result
 def test10(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     stars = new_plummer_model(100)
     stars.radius = 0 | nbody_system.length
     
     instance.particles.add_particles(stars)
     channel = stars.new_channel_to(instance.particles)
     
     instance.evolve_model(0.001 | nbody_system.time)
 
     e0 = instance.kinetic_energy + instance.potential_energy
     
     stars.mass *= 0.9
     channel.copy()
     
     instance.synchronize_model()
     
     e1 = instance.kinetic_energy + instance.potential_energy
     
     delta_e = e1 - e0
     
     self.assertTrue(e1 != e0)
     
     instance.stop()
 def test7(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(2)
     particles.mass = [1.0, 1.0] | nbody_system.mass
     particles.radius =  [0.0001, 0.0001] | nbody_system.length
     particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
     particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     
     instance.commit_particles()
     
     zero = [0.0, 0.0, 0.0] | nbody_system.length
     fx, fy, fz = instance.get_gravity_at_point(zero, [0.5, 1.0, 1.5] | nbody_system.length, zero, zero)
     self.assertAlmostRelativeEqual(fx[0], -3.55555555556 | nbody_system.acceleration, 5)
     self.assertAlmostRelativeEqual(fy[0], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[0], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fx[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fy[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[1], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fx[2], 3.55555555556 | nbody_system.acceleration, 5)
     self.assertAlmostRelativeEqual(fy[2], 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostRelativeEqual(fz[2], 0.0 | nbody_system.acceleration, 3)
     
     n = 512
     x = nbody_system.length.new_quantity(numpy.linspace(0.1, 1.9, n))
     zero = nbody_system.length.new_quantity(numpy.zeros(n))
     fx, fy, fz = instance.get_gravity_at_point(zero, x, zero, zero)
     for i in range(n/2):
         self.assertAlmostRelativeEqual(fx[i], - fx[n - 1 - i], 5)
     
     instance.stop()
 def new_instance_of_capreole_and_nbody_code(self):
     gridcode=Capreole(number_of_workers=self.number_of_workers)
     gridcode.initialize_code()
     nbodycode = PhiGRAPE(mode="gpu")
     #nbodycode = Octgrav(mode="gpu")
     nbodycode.initialize_code()
     nbodycode.parameters.epsilon_squared = (self.size / (10000.0 * self.number_of_grid_points)) ** 2
     nbodycode.commit_parameters()
     
     result = HydroGridAndNbodyWithAccelerationTransfer(gridcode, nbodycode)
     return result
Exemple #9
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 def test11(self):
     print "Testing PhiGRAPE collision_detection"
     particles = datamodel.Particles(7)
     particles.mass = 0.001 | nbody_system.mass
     particles.radius = 0.01 | nbody_system.length
     particles.x = [-101.0, -100.0, -0.5, 0.5, 100.0, 101.0, 104.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.velocity = [[2, 0, 0], [-2, 0, 0]]*3 + [[-4, 0, 0]] | nbody_system.speed
     
     instance = PhiGRAPE(redirection='none', **default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     instance.particles.add_particles(particles)
     collisions = instance.stopping_conditions.collision_detection
     collisions.enable()
     instance.evolve_model(1.0 | nbody_system.time)
     
     self.assertTrue(collisions.is_set())
     self.assertTrue(instance.model_time < 0.5 | nbody_system.time)
     self.assertEquals(len(collisions.particles(0)), 3)
     self.assertEquals(len(collisions.particles(1)), 3)
     self.assertEquals(len(particles - collisions.particles(0) - collisions.particles(1)), 1)
     self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) < 
             (collisions.particles(0).radius + collisions.particles(1).radius),
             [True, True, True])
     
     sticky_merged = datamodel.Particles(len(collisions.particles(0)))
     sticky_merged.mass = collisions.particles(0).mass + collisions.particles(1).mass
     sticky_merged.radius = collisions.particles(0).radius
     for p1, p2, merged in zip(collisions.particles(0), collisions.particles(1), sticky_merged):
         merged.position = (p1 + p2).center_of_mass()
         merged.velocity = (p1 + p2).center_of_mass_velocity()
     
     print instance.model_time
     print instance.particles
     instance.particles.remove_particles(collisions.particles(0) + collisions.particles(1))
     instance.particles.add_particles(sticky_merged)
     
     instance.evolve_model(1.0 | nbody_system.time)
     print
     print instance.model_time
     print instance.particles
     self.assertTrue(collisions.is_set())
     self.assertTrue(instance.model_time < 1.0 | nbody_system.time)
     self.assertEquals(len(collisions.particles(0)), 1)
     self.assertEquals(len(collisions.particles(1)), 1)
     self.assertEquals(len(instance.particles - collisions.particles(0) - collisions.particles(1)), 2)
     self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) < 
             (collisions.particles(0).radius + collisions.particles(1).radius),
             [True])
     instance.stop()
Exemple #10
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    def test14(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0,10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx =  0 | nbody_system.speed
        particles.vy =  0 | nbody_system.speed
        particles.vz =  0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass

        very_short_time_to_evolve = 1 | units.s
        very_long_time_to_evolve = 1e9 | nbody_system.time

        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_timeout = very_short_time_to_evolve
        self.assertEquals(instance.parameters.stopping_conditions_timeout, very_short_time_to_evolve)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles) 
        instance.stopping_conditions.timeout_detection.enable()
        start = time.time()
        instance.evolve_model(very_long_time_to_evolve)
        end = time.time()
        self.assertTrue(instance.stopping_conditions.timeout_detection.is_set())
        self.assertTrue((end-start)<very_short_time_to_evolve.value_in(units.s) + 2)#2 = some overhead compensation

        instance.stop()
 def new_instance_of_athena_and_nbody_code(self):
     gridcode=Athena(redirection="none", number_of_workers=1)
     gridcode.initialize_code()
     gridcode.parameters.gamma = self.gamma
     gridcode.parameters.courant_number=0.3
     
     gridcode.set_has_external_gravitational_potential(1)
     
     nbodycode = PhiGRAPE(mode="gpu")
     #nbodycode = Octgrav(mode="gpu")
     nbodycode.initialize_code()
     nbodycode.parameters.epsilon_squared = (self.size / (10000.0 * self.number_of_grid_points)) ** 2
     nbodycode.commit_parameters()
     
     result = HydroGridAndNbody(gridcode, nbodycode)
     return result
Exemple #12
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 def test11(self):
     print "Testing PhiGRAPE collision_detection"
     particles = datamodel.Particles(7)
     particles.mass = 0.001 | nbody_system.mass
     particles.radius = 0.01 | nbody_system.length
     particles.x = [-101.0, -100.0, -0.5, 0.5, 100.0, 101.0, 104.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.velocity = [[2, 0, 0], [-2, 0, 0]]*3 + [[-4, 0, 0]] | nbody_system.speed
     
     instance = PhiGRAPE(redirection='none', **default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     instance.particles.add_particles(particles)
     collisions = instance.stopping_conditions.collision_detection
     collisions.enable()
     instance.evolve_model(1.0 | nbody_system.time)
     
     self.assertTrue(collisions.is_set())
     self.assertTrue(instance.model_time < 0.5 | nbody_system.time)
     self.assertEquals(len(collisions.particles(0)), 3)
     self.assertEquals(len(collisions.particles(1)), 3)
     self.assertEquals(len(particles - collisions.particles(0) - collisions.particles(1)), 1)
     self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) < 
             (collisions.particles(0).radius + collisions.particles(1).radius),
             [True, True, True])
     
     sticky_merged = datamodel.Particles(len(collisions.particles(0)))
     sticky_merged.mass = collisions.particles(0).mass + collisions.particles(1).mass
     sticky_merged.radius = collisions.particles(0).radius
     for p1, p2, merged in zip(collisions.particles(0), collisions.particles(1), sticky_merged):
         merged.position = (p1 + p2).center_of_mass()
         merged.velocity = (p1 + p2).center_of_mass_velocity()
     
     print instance.model_time
     print instance.particles
     instance.particles.remove_particles(collisions.particles(0) + collisions.particles(1))
     instance.particles.add_particles(sticky_merged)
     
     instance.evolve_model(1.0 | nbody_system.time)
     print
     print instance.model_time
     print instance.particles
     self.assertTrue(collisions.is_set())
     self.assertTrue(instance.model_time < 1.0 | nbody_system.time)
     self.assertEquals(len(collisions.particles(0)), 1)
     self.assertEquals(len(collisions.particles(1)), 1)
     self.assertEquals(len(instance.particles - collisions.particles(0) - collisions.particles(1)), 2)
     self.assertEquals(abs(collisions.particles(0).x - collisions.particles(1).x) < 
             (collisions.particles(0).radius + collisions.particles(1).radius),
             [True])
     instance.stop()
Exemple #13
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    def test14(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0,10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx =  0 | nbody_system.speed
        particles.vy =  0 | nbody_system.speed
        particles.vz =  0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass

        very_short_time_to_evolve = 1 | units.s
        very_long_time_to_evolve = 1e9 | nbody_system.time

        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_timeout = very_short_time_to_evolve
        self.assertEquals(instance.parameters.stopping_conditions_timeout, very_short_time_to_evolve)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles) 
        instance.stopping_conditions.timeout_detection.enable()
        start = time.time()
        instance.evolve_model(very_long_time_to_evolve)
        end = time.time()
        self.assertTrue(instance.stopping_conditions.timeout_detection.is_set())
        self.assertTrue((end-start)<very_short_time_to_evolve.value_in(units.s) + 2)#2 = some overhead compensation

        instance.stop()
Exemple #14
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    def test4(self):
        convert_nbody = nbody_system.nbody_to_si(5.0 | units.kg, 10.0 | units.m)

        instance = PhiGRAPE(convert_nbody, **default_test_options)

        instance.initialize_code()
        instance.parameters.set_defaults()
        
        particles = datamodel.Particles(2)
        self.assertEquals(len(instance.particles), 0)
        
        particles.mass = [15.0, 30.0] | units.kg
        particles.radius =  [10.0, 20.0] | units.m
        particles.position = [[10.0, 20.0, 30.0], [20.0, 40.0, 60.0]] | units.m
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.m / units.s

        
        instance.particles.add_particles(particles)
        self.assertEquals(len(instance.particles), 2)
        
        instance.particles.mass =  [17.0, 33.0] | units.kg
        
        self.assertEquals(instance.get_mass(1), 17.0| units.kg) 
        self.assertEquals(instance.get_mass(2), 33.0| units.kg)  
        
        instance.stop()
Exemple #15
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    def test19(self):
        converter = nbody_system.nbody_to_si(1 | units.MSun, 1 | units.parsec)
        
        particles = datamodel.Particles(2)
        particles.mass = 100 | units.MSun
        particles.radius = 200 | units.RSun
        particles[0].position = [0,0,0] | units.parsec
        particles[1].position = [1,0,0] | units.parsec
        particles.velocity = [0,0,0] |  units.km / units.s


        code = PhiGRAPE(
            converter, 
            PhiGRAPEInterface.MODE_G6LIB,
            number_of_workers=2
        )
        code.initialize_code()
        stop_cond = code.stopping_conditions.collision_detection
        stop_cond.enable()
       
        code.particles.add_particles(particles)

        code.evolve_model( 0.08 | nbody_system.time)
        
        self.assertTrue(stop_cond.is_set())
Exemple #16
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    def test4(self):
        convert_nbody = nbody_system.nbody_to_si(5.0 | units.kg, 10.0 | units.m)

        instance = PhiGRAPE(convert_nbody, **default_test_options)

        instance.initialize_code()
        instance.parameters.set_defaults()
        
        particles = datamodel.Particles(2)
        self.assertEquals(len(instance.particles), 0)
        
        particles.mass = [15.0, 30.0] | units.kg
        particles.radius =  [10.0, 20.0] | units.m
        particles.position = [[10.0, 20.0, 30.0], [20.0, 40.0, 60.0]] | units.m
        particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.m / units.s

        
        instance.particles.add_particles(particles)
        self.assertEquals(len(instance.particles), 2)
        
        instance.particles.mass =  [17.0, 33.0] | units.kg
        
        self.assertEquals(instance.get_mass(1), 17.0| units.kg) 
        self.assertEquals(instance.get_mass(2), 33.0| units.kg)  
        
        instance.stop()
Exemple #17
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 def test18(self):
     print "Testing PhiGRAPE delete_particle"
     number_of_particles = 15
     delete_order = [6, 9, 3, 1, 0, 2, 5]
     number_of_initial_deletes = 3
     
     particles = datamodel.Particles(number_of_particles)
     particles.mass = range(1, number_of_particles + 1) | nbody_system.mass
     particles.radius = 0.01 | nbody_system.length
     particles.x = range(number_of_particles) | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.vx = range(number_of_particles) | nbody_system.speed
     particles.vy = 0 | nbody_system.speed
     particles.vz = 0 | nbody_system.speed
     
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     initial_number_of_particles = number_of_particles - len(delete_order) + number_of_initial_deletes
     instance.particles.add_particles(particles[:initial_number_of_particles])
     index_new_particle = initial_number_of_particles
     
     self.assertEquals(len(instance.particles), initial_number_of_particles)
     instance.evolve_model(0.01 | nbody_system.time)
     instance.particles.remove_particles(particles[delete_order[:number_of_initial_deletes]])
     number_of_deletes = number_of_initial_deletes
     self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes)
     
     for i, particle_index in enumerate(delete_order[number_of_initial_deletes:]):
         instance.evolve_model((i+1) / 10.0 | nbody_system.time)
         instance.particles.remove_particle(particles[particle_index])
         number_of_deletes += 1
         instance.particles.add_particle(particles[index_new_particle])
         index_new_particle += 1
         self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1)
         self.assertAlmostEquals(particles[:index_new_particle].total_mass() - instance.particles.total_mass(), 
             (delete_order[:number_of_deletes] | nbody_system.mass).sum() + (number_of_deletes | nbody_system.mass))
     
     instance.stop()
Exemple #18
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 def test5(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(2)
     particles.mass = [1.0, 1.0] | nbody_system.mass
     particles.radius =  [0.0001, 0.0001] | nbody_system.length
     particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
     particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     
     instance.commit_particles()
     
     zero = 0.0 | nbody_system.length
     fx, fy, fz = instance.get_gravity_at_point(zero, 1.0| nbody_system.length, zero, zero)
     self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
     for x in (0.25, 0.5, 0.75):
         x0 = x| nbody_system.length
         x1 = (2.0 - x) | nbody_system.length
         potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
         potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
         fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
         fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)
         
         self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)
         
         self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
         fx = (-1.0 / (x0**2) + 1.0 / (x1**2)) * (1.0 | nbody_system.length ** 3 / nbody_system.time ** 2)
         self.assertAlmostEqual(fx, fx0, 2)
         self.assertAlmostEqual(potential0, potential1, 5)
   
     instance.stop()
Exemple #19
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 def test6(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(6)
     particles.mass = nbody_system.mass.new_quantity(range(1,7))
     particles.radius =   0.00001 | nbody_system.length
     particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
     particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     instance.commit_particles()
     copyof = instance.particles.copy()
     
     self.assertEquals(2 | nbody_system.mass, copyof[1].mass)  
     
     instance.stop()
Exemple #20
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 def test18(self):
     print "Testing PhiGRAPE delete_particle"
     number_of_particles = 15
     delete_order = [6, 9, 3, 1, 0, 2, 5]
     number_of_initial_deletes = 3
     
     particles = datamodel.Particles(number_of_particles)
     particles.mass = range(1, number_of_particles + 1) | nbody_system.mass
     particles.radius = 0.01 | nbody_system.length
     particles.x = range(number_of_particles) | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.vx = range(number_of_particles) | nbody_system.speed
     particles.vy = 0 | nbody_system.speed
     particles.vz = 0 | nbody_system.speed
     
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     initial_number_of_particles = number_of_particles - len(delete_order) + number_of_initial_deletes
     instance.particles.add_particles(particles[:initial_number_of_particles])
     index_new_particle = initial_number_of_particles
     
     self.assertEquals(len(instance.particles), initial_number_of_particles)
     instance.evolve_model(0.01 | nbody_system.time)
     instance.particles.remove_particles(particles[delete_order[:number_of_initial_deletes]])
     number_of_deletes = number_of_initial_deletes
     self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes)
     
     for i, particle_index in enumerate(delete_order[number_of_initial_deletes:]):
         instance.evolve_model((i+1) / 10.0 | nbody_system.time)
         instance.particles.remove_particle(particles[particle_index])
         number_of_deletes += 1
         instance.particles.add_particle(particles[index_new_particle])
         index_new_particle += 1
         self.assertEquals(len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1)
         self.assertAlmostEquals(particles[:index_new_particle].total_mass() - instance.particles.total_mass(), 
             (delete_order[:number_of_deletes] | nbody_system.mass).sum() + (number_of_deletes | nbody_system.mass))
     
     instance.stop()
Exemple #21
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    def test_phigrape(self):

        convert_nbody = nbody_system.nbody_to_si(1.0 | units.kg, 1.0 | units.km)

        phigrape = PhiGRAPE(convert_nbody)
        phigrape.parameters.epsilon_squared = 10 | units.km**2

        docstring =  phigrape.parameters.__doc__
        print docstring
        self.assertTrue("smoothing parameter for gravity calculations (default value:0.0 m**2)" in docstring)
        self.assertTrue("timestep parameter (default value:0.02" in docstring)
        self.assertTrue("parameter to determine the initial timestep (default value:0.01" in docstring)

        parameter_str_method_output = str(phigrape.parameters)
        self.assertTrue("epsilon_squared: 10000000.0 m**2" in parameter_str_method_output)
        self.assertTrue("timestep_parameter: 0.0" in parameter_str_method_output)
        self.assertTrue("initial_timestep_parameter: 0.0" in parameter_str_method_output)
    def new_instance_of_capreole_and_nbody_code(self):
        gridcode = Capreole(number_of_workers=self.number_of_workers)
        gridcode.initialize_code()
        nbodycode = PhiGRAPE(mode="gpu")
        #nbodycode = Octgrav(mode="gpu")
        nbodycode.initialize_code()
        nbodycode.parameters.epsilon_squared = (
            self.size / (10000.0 * self.number_of_grid_points))**2
        nbodycode.commit_parameters()

        result = HydroGridAndNbodyWithAccelerationTransfer(gridcode, nbodycode)
        return result
Exemple #23
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 def test6(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(6)
     particles.mass = nbody_system.mass.new_quantity(range(1,7))
     particles.radius =   0.00001 | nbody_system.length
     particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
     particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     instance.commit_particles()
     copyof = instance.particles.copy()
     
     self.assertEquals(2 | nbody_system.mass, copyof[1].mass)  
     
     instance.stop()
Exemple #24
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    def test13(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0,10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx =  0 | nbody_system.speed
        particles.vy =  0 | nbody_system.speed
        particles.vz =  0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass
       
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_number_of_steps = 2
        self.assertEquals(instance.parameters.stopping_conditions_number_of_steps, 2)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles) 
        instance.stopping_conditions.number_of_steps_detection.enable()
        instance.evolve_model(10 | nbody_system.time)
        self.assertTrue(instance.stopping_conditions.number_of_steps_detection.is_set())
        self.assertTrue(instance.model_time < 10 | nbody_system.time)

        instance.stop()
    def new_instance_of_athena_and_nbody_code(self):
        gridcode = Athena(redirection="none", number_of_workers=1)
        gridcode.initialize_code()
        gridcode.parameters.gamma = self.gamma
        gridcode.parameters.courant_number = 0.3

        gridcode.set_has_external_gravitational_potential(1)

        nbodycode = PhiGRAPE(mode="gpu")
        #nbodycode = Octgrav(mode="gpu")
        nbodycode.initialize_code()
        nbodycode.parameters.epsilon_squared = (
            self.size / (10000.0 * self.number_of_grid_points))**2
        nbodycode.commit_parameters()

        result = HydroGridAndNbody(gridcode, nbodycode)
        return result
Exemple #26
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def init_integrator(method):
    if method == 'octgrav':
        gravity = Octgrav()
    elif method == 'ph4':
        gravity = ph4()
    elif method == 'fi':
        gravity = Fi(convert_nbody)
        gravity.initialize_code()
        gravity.parameters.epsilon_squared = 0.00000001 | units.AU**2
        gravity.parameters.timestep = .10 | units.day
    elif method == 'phigrape':
        gravity = PhiGRAPE(convert_nbody, mode=PhiGRAPEInterface.MODE_GPU)
    elif method == 'bhtree':
        gravity = BHTree(convert_nbody, number_of_workes=workers)
    elif method == 'hermite':
        gravity = Hermite(convert_nbody,
                          number_of_workers=workers
                          #debugger = "xterm",
                          #redirection = "none"
                          )

    gravity.parameters.epsilon_squared = 0.00001 | units.AU**2

    return gravity
Exemple #27
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    def test13(self):
        particles = datamodel.Particles(2)
        particles.x = [0.0,10.0] | nbody_system.length
        particles.y = 0 | nbody_system.length
        particles.z = 0 | nbody_system.length
        particles.radius = 0.005 | nbody_system.length
        particles.vx =  0 | nbody_system.speed
        particles.vy =  0 | nbody_system.speed
        particles.vz =  0 | nbody_system.speed
        particles.mass = 1.0 | nbody_system.mass
       
        instance = PhiGRAPE(**default_test_options)
        instance.initialize_code()
        instance.parameters.stopping_conditions_number_of_steps = 2
        self.assertEquals(instance.parameters.stopping_conditions_number_of_steps, 2)
        instance.parameters.epsilon_squared = (0.01 | nbody_system.length)**2
        instance.particles.add_particles(particles) 
        instance.stopping_conditions.number_of_steps_detection.enable()
        instance.evolve_model(10 | nbody_system.time)
        self.assertTrue(instance.stopping_conditions.number_of_steps_detection.is_set())
        self.assertTrue(instance.model_time < 10 | nbody_system.time)

        instance.stop()
Exemple #28
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 def test5(self):
     instance = PhiGRAPE(**default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     particles = datamodel.Particles(2)
     particles.mass = [1.0, 1.0] | nbody_system.mass
     particles.radius =  [0.0001, 0.0001] | nbody_system.length
     particles.position = [[0.0,0.0,0.0], [2.0,0.0,0.0]] | nbody_system.length
     particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | nbody_system.speed
     instance.particles.add_particles(particles)
     
     instance.commit_particles()
     
     zero = 0.0 | nbody_system.length
     fx, fy, fz = instance.get_gravity_at_point(zero, 1.0| nbody_system.length, zero, zero)
     self.assertAlmostEqual(fx, 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostEqual(fy, 0.0 | nbody_system.acceleration, 3)
     self.assertAlmostEqual(fz, 0.0 | nbody_system.acceleration, 3)
     for x in (0.25, 0.5, 0.75):
         x0 = x| nbody_system.length
         x1 = (2.0 - x) | nbody_system.length
         potential0 = instance.get_potential_at_point(zero, x0, zero, zero)
         potential1 = instance.get_potential_at_point(zero, x1, zero, zero)
         fx0, fy0, fz0 = instance.get_gravity_at_point(zero, x0, zero, zero)
         fx1, fy1, fz1 = instance.get_gravity_at_point(zero, x1, zero, zero)
         
         self.assertAlmostEqual(fy0, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fz0, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fy1, 0.0 | nbody_system.acceleration, 3)
         self.assertAlmostEqual(fz1, 0.0 | nbody_system.acceleration, 3)
         
         self.assertAlmostEqual(fx0, -1.0 * fx1, 5)
         fx = (-1.0 / (x0**2) + 1.0 / (x1**2)) * (1.0 | nbody_system.length ** 3 / nbody_system.time ** 2)
         self.assertAlmostEqual(fx, fx0, 2)
         self.assertAlmostEqual(potential0, potential1, 5)
   
     instance.stop()
Exemple #29
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 def test17(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)
     instance.initialize_code()
 
     instance.parameters.set_defaults()
     instance.parameters.initial_timestep_parameter = 0.001
     instance.parameters.timestep_parameter = 0.001
     instance.parameters.epsilon_squared = 0.0 | units.AU**2
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
 
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     position_at_start = earth.position.value_in(units.AU)[0]
     print instance.particles[0].position.as_quantity_in(units.AU)
     print instance.particles[1].position.as_quantity_in(units.AU)
     instance.evolve_model(365 | units.day)
     print instance.particles[0].position.as_quantity_in(units.AU)
     print instance.particles[1].position.as_quantity_in(units.AU)
 
     instance.particles.copy_values_of_all_attributes_to(stars)
     
     position_after_full_rotation = earth.position.value_in(units.AU)[0]
     
     self.assertAlmostEqual(position_at_start, position_after_full_rotation, 3)
     
     print instance.particles[0].position.as_quantity_in(units.AU)
     instance.evolve_model(365.0 + (365.0 / 2) | units.day)
     
     print instance.particles[0].position.as_quantity_in(units.AU)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
             
     instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4)  | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
     #self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #30
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 def test16(self):
     instance = PhiGRAPE(number_of_workers = 2, **default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     print 1
     particles = datamodel.Particles(2)
     particles.x = [-1.0,1.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.radius = 0.005 | nbody_system.length
     particles.vx =  0 | nbody_system.speed
     particles.vy =  0 | nbody_system.speed
     particles.vz =  0 | nbody_system.speed
     particles.mass = [1.0, 0.5] | nbody_system.mass
     
     instance.particles.add_particles(particles)
     instance.commit_particles()
 
     instance.evolve_model(0.01 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999984741095 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x,  0.999969482189 | nbody_system.length, 8)
     
     instance.evolve_model(0.10 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999022960148 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.998045920305 | nbody_system.length, 8)
     
     instance.evolve_model(0.50 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.984250788742 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968501583383 | nbody_system.length, 8)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #31
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 def test15(self):
     instance = PhiGRAPE(number_of_workers = 2, **default_test_options)#, redirection = "none")
     instance.initialize_code()
     instance.parameters.set_defaults()
     print 1
     particles = datamodel.Particles(2)
     particles.x = [-1.0,1.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.radius = 0.005 | nbody_system.length
     particles.vx =  0 | nbody_system.speed
     particles.vy =  0 | nbody_system.speed
     particles.vz =  0 | nbody_system.speed
     particles.mass = 1.0 | nbody_system.mass
     
     instance.particles.add_particles(particles)
     instance.commit_particles()
 
     instance.evolve_model(0.01 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482111 | nbody_system.length, 6)
     
     instance.evolve_model(0.10 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.99804560161 | nbody_system.length, 6)
     
     instance.evolve_model(0.50 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968416814302 | nbody_system.length, 6)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #32
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 def test2(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)
     
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     for x in range(1,365,30):
         instance.evolve_model(x | units.day)
         instance.particles.copy_values_of_all_attributes_to(stars)
         stars.savepoint()
     
     if HAS_MATPLOTLIB:
         figure = pyplot.figure()
         plot = figure.add_subplot(1,1,1)
         
         x_points = earth.get_timeline_of_attribute("x")
         y_points = earth.get_timeline_of_attribute("y")
         
         x_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), x_points)
         y_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), y_points)
         
         plot.scatter(x_points_in_AU,y_points_in_AU, color = "b", marker = 'o')
         
         plot.set_xlim(-1.5, 1.5)
         plot.set_ylim(-1.5, 1.5)
         
         test_results_path = self.get_path_to_results()
         output_file = os.path.join(test_results_path, "phiGRAPE-earth-sun2.svg")
         figure.savefig(output_file)
     
     instance.cleanup_code()
     instance.stop()
Exemple #33
0
def simulate_small_cluster(number_of_stars,
                           end_time=40 | units.Myr,
                           name_of_the_figure="test-2.svg"):
    random.seed()

    salpeter_masses = new_salpeter_mass_distribution(number_of_stars)
    total_mass = salpeter_masses.sum()

    convert_nbody = nbody_system.nbody_to_si(total_mass, 1.0 | units.parsec)
    convert_nbody.set_as_default()

    particles = new_plummer_model(number_of_stars, convert_nbody)

    gravity = PhiGRAPE(convert_nbody, mode="gpu")
    gravity.initialize_code()
    gravity.parameters.timestep_parameter = 0.01
    gravity.parameters.initial_timestep_parameter = 0.01
    gravity.parameters.epsilon_squared = 0.000001 | units.parsec**2

    stellar_evolution = SSE()
    stellar_evolution.initialize_module_with_default_parameters()

    #print "setting masses of the stars"
    particles.radius = 0.0 | units.RSun

    #comment out to get plummer masses
    particles.mass = salpeter_masses

    gravity.particles.add_particles(particles)
    gravity.initialize_particles(0.0)

    from_model_to_gravity = particles.new_channel_to(gravity.particles)
    from_gravity_to_model = gravity.particles.new_channel_to(particles)

    time = 0.0 | units.Myr
    particles.savepoint(time)

    move_particles_to_center_of_mass(particles)

    kineticEnergy = gravity.kinetic_energy.value_in(units.J)
    potentialEnergy = gravity.potential_energy.value_in(units.J)
    ToverV = kineticEnergy / potentialEnergy

    file.write(str(time.value_in(units.Myr)))
    file.write(' ')
    file.write(str(ToverV))
    file.write('\n')

    while time < end_time:
        time += 0.25 | units.Myr
        gravity.evolve_model(time)
        from_gravity_to_model.copy()
        print "Evolved model to t    =", str(time)
        print "Evolved model to t    =", str(
            convert_nbody.to_nbody(time.value_in(units.Myr) | units.Myr))

        kineticEnergy = gravity.kinetic_energy.value_in(units.J)
        potentialEnergy = gravity.potential_energy.value_in(units.J)
        ToverV = kineticEnergy / potentialEnergy

        print "Kin / Pot             =", ToverV
        #print "Particle Mass         =", particles[1].mass

        file.write(str(time.value_in(units.Myr)))
        file.write(' ')
        file.write(str(ToverV))
        file.write('\n')

    file.close()

    if os.path.exists('small.hdf5'):
        os.remove('small.hdf5')
    storage = store.StoreHDF("small.hdf5")
    storage.store(particles)

    del gravity
    del stellar_evolution
Exemple #34
0
 def test2(self):
     
     instance = PhiGRAPE()
     self._run_addition_removal_test(instance)
Exemple #35
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 def test15(self):
     instance = PhiGRAPE(number_of_workers = 2, **default_test_options)#, redirection = "none")
     instance.initialize_code()
     instance.parameters.set_defaults()
     print 1
     particles = datamodel.Particles(2)
     particles.x = [-1.0,1.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.radius = 0.005 | nbody_system.length
     particles.vx =  0 | nbody_system.speed
     particles.vy =  0 | nbody_system.speed
     particles.vz =  0 | nbody_system.speed
     particles.mass = 1.0 | nbody_system.mass
     
     instance.particles.add_particles(particles)
     instance.commit_particles()
 
     instance.evolve_model(0.01 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.999969482111 | nbody_system.length, 6)
     
     instance.evolve_model(0.10 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.99804560161 | nbody_system.length, 6)
     
     instance.evolve_model(0.50 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertEquals(instance.particles[0].position.x, -instance.particles[1].position.x)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968416814302 | nbody_system.length, 6)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #36
0
 def test9(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)#, debugger="xterm")
     instance.initialize_code()
 
     instance.parameters.set_defaults()
     instance.parameters.initialize_gpu_once = 1
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
 
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     instance.evolve_model(365 | units.day)
 
     instance.particles.copy_values_of_all_attributes_to(stars)
     
     position_at_start = earth.position.value_in(units.AU)[0]
     position_after_full_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)
     
     instance.evolve_model(365.0 + (365.0 / 2) | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
             
     instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4)  | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
     #self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #37
0
 def test8(self):
     particles = datamodel.Particles(6)
     particles.mass = nbody_system.mass.new_quantity(range(1,7))
     particles.radius =   0.00001 | nbody_system.length
     particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
     particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
     
     for current_mode in ['g6lib','gpu','grape']:
         try:
             instance = PhiGRAPE(mode = current_mode)
         except:
             print "Running PhiGRAPE with mode=" + current_mode, "was unsuccessful."
         else:
             print "Running PhiGRAPE with mode=" + current_mode + "...",
             instance.initialize_code()
             instance.particles.add_particles(particles)
             instance.commit_particles()
             instance.evolve_model(0.1 | nbody_system.time)
             instance.cleanup_code()
             instance.stop()
             print "ok"
Exemple #38
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 def test16(self):
     instance = PhiGRAPE(number_of_workers = 2, **default_test_options)
     instance.initialize_code()
     instance.parameters.set_defaults()
     print 1
     particles = datamodel.Particles(2)
     particles.x = [-1.0,1.0] | nbody_system.length
     particles.y = 0 | nbody_system.length
     particles.z = 0 | nbody_system.length
     particles.radius = 0.005 | nbody_system.length
     particles.vx =  0 | nbody_system.speed
     particles.vy =  0 | nbody_system.speed
     particles.vz =  0 | nbody_system.speed
     particles.mass = [1.0, 0.5] | nbody_system.mass
     
     instance.particles.add_particles(particles)
     instance.commit_particles()
 
     instance.evolve_model(0.01 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999984741095 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x,  0.999969482189 | nbody_system.length, 8)
     
     instance.evolve_model(0.10 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.999022960148 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.998045920305 | nbody_system.length, 8)
     
     instance.evolve_model(0.50 | nbody_system.time)
 
     instance.particles.copy_values_of_all_attributes_to(particles)
     
     print instance.particles.position.x
     self.assertAlmostRelativeEquals(instance.particles[0].position.x, -0.984250788742 | nbody_system.length, 8)
     self.assertAlmostRelativeEquals(instance.particles[1].position.x, 0.968501583383 | nbody_system.length, 8)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #39
0
 def test17(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)
     instance.initialize_code()
 
     instance.parameters.set_defaults()
     instance.parameters.initial_timestep_parameter = 0.001
     instance.parameters.timestep_parameter = 0.001
     instance.parameters.epsilon_squared = 0.0 | units.AU**2
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
 
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     position_at_start = earth.position.value_in(units.AU)[0]
     print instance.particles[0].position.as_quantity_in(units.AU)
     print instance.particles[1].position.as_quantity_in(units.AU)
     instance.evolve_model(365 | units.day)
     print instance.particles[0].position.as_quantity_in(units.AU)
     print instance.particles[1].position.as_quantity_in(units.AU)
 
     instance.particles.copy_values_of_all_attributes_to(stars)
     
     position_after_full_rotation = earth.position.value_in(units.AU)[0]
     
     self.assertAlmostEqual(position_at_start, position_after_full_rotation, 3)
     
     print instance.particles[0].position.as_quantity_in(units.AU)
     instance.evolve_model(365.0 + (365.0 / 2) | units.day)
     
     print instance.particles[0].position.as_quantity_in(units.AU)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
             
     instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4)  | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
     #self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #40
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def simulate_small_cluster(number_of_stars,
                           end_time=40 | units.Myr,
                           name_of_the_figure="test-2.svg"):
    random.seed()

    salpeter_masses = new_salpeter_mass_distribution(number_of_stars)
    total_mass = salpeter_masses.sum()

    convert_nbody = nbody_system.nbody_to_si(total_mass, 1.0 | units.parsec)
    convert_nbody.set_as_default()

    print 'end_time:', convert_nbody.to_nbody(end_time)
    print convert_nbody.to_nbody(total_mass)

    particles = new_plummer_model(number_of_stars, convert_nbody)

    gravity = PhiGRAPE(convert_nbody, mode="gpu", use_gl="true")
    gravity.parameters.timestep_parameter = 0.01
    gravity.parameters.initial_timestep_parameter = 0.01
    gravity.parameters.epsilon_squared = 0.0015 | units.parsec**2

    particles.radius = 0.0 | units.RSun
    #    particles.mass = salpeter_masses

    move_particles_to_center_of_mass(particles)

    gravity.particles.add_particles(particles)

    gravity.initialize_particles(0.0)

    gravity.start_viewer()

    from_model_to_gravity = particles.new_channel_to(gravity.particles)
    from_gravity_to_model = gravity.particles.new_channel_to(particles)

    time = 0.0 | units.Myr
    #    particles.savepoint(time)

    kineticEnergy = gravity.kinetic_energy.value_in(units.J)
    potentialEnergy = gravity.potential_energy.value_in(units.J)
    ToverV = kineticEnergy / potentialEnergy
    E0 = convert_nbody.to_nbody(gravity.kinetic_energy +
                                gravity.potential_energy)

    file.write(str(time.value_in(units.Myr)))
    file.write(' ')
    file.write(str(ToverV))
    file.write('\n')

    gravity.parameters.timestep_parameter = 0.01
    gravity.parameters.initial_timestep_parameter = 0.01

    while time < end_time:
        time += 0.5 * convert_nbody.to_si(1 | nbody_system.time)
        gravity.evolve_model(time)
        gravity.synchronize_model()
        from_gravity_to_model.copy()
        print "Evolved model to t    =", str(time)

        kineticEnergy = gravity.kinetic_energy.value_in(units.J)
        potentialEnergy = gravity.potential_energy.value_in(units.J)
        ToverV = kineticEnergy / potentialEnergy
        Et = convert_nbody.to_nbody(gravity.kinetic_energy +
                                    gravity.potential_energy)

        print "Kin / Pot             =", ToverV, (Et - E0) / E0

        file.write(str(time.value_in(units.Myr)))
        file.write(' ')
        file.write(str(ToverV))
        file.write('\n')

    file.close()

    if os.path.exists('small.hdf5'):
        os.remove('small.hdf5')
    storage = store.StoreHDF("small.hdf5")
    storage.store(particles)

    del gravity
    del stellar_evolution
Exemple #41
0
    orbit_frac = 0.5
    print "orbit_frac=%s" % (orbit_frac, )

    # case 1: central body with an orbiting planet
    T = two_body_orbital_period(m1=1 / 20000, m2=10e-10, a=4.8481e-6, e=0.5)
    print "two_body_central period=%s" % (T, )
    r = nbe.NBodyComputation(initialConditions=two_body_initial_conditions(
        m1=1 / 20000, m2=10e-10, a=4.8481e-6, e=0.5),
                             dt=T / 100 | nbody_system.time,
                             tFinal=orbit_frac * T | nbody_system.time,
                             analyticSolution=None,
                             ndim=2,
                             outfName="two_body_central")

    # run the problem on two integrators
    r.runProblemOnIntegrator(PhiGRAPE(), label="PhiGRAPE", printProgress=False)
    r.runProblemOnIntegrator(Hermite(), label="Hermite", printProgress=False)
    hc = huayno_cc.Huayno(redirection='none')
    hc.initialize_code()
    hc.set_inttype_parameter(huayno_cc.Huayno.EVOLVE_HOLD_DKD_CC)
    hc.set_timestep_parameter(0.01)
    r.runProblemOnIntegrator(hc, label="Huayno_CC", printProgress=False)

    # plot a comparison in energy
    r.plotTotalEnergyRelativeError(labels=["PhiGRAPE", "Hermite", "Huayno_CC"])

    # plot trajectories
    r.plotTrajectories(label="PhiGRAPE")
    r.plotTrajectories(label="Hermite")
    r.plotTrajectories(label="Huayno_CC")
Exemple #42
0
 def test2(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)
     
     instance.initialize_code()
     instance.parameters.set_defaults()
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     for x in range(1,365,30):
         instance.evolve_model(x | units.day)
         instance.particles.copy_values_of_all_attributes_to(stars)
         stars.savepoint()
     
     if HAS_MATPLOTLIB:
         figure = pyplot.figure()
         plot = figure.add_subplot(1,1,1)
         
         x_points = earth.get_timeline_of_attribute("x")
         y_points = earth.get_timeline_of_attribute("y")
         
         x_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), x_points)
         y_points_in_AU = map(lambda (t,x) : x.value_in(units.AU), y_points)
         
         plot.scatter(x_points_in_AU,y_points_in_AU, color = "b", marker = 'o')
         
         plot.set_xlim(-1.5, 1.5)
         plot.set_ylim(-1.5, 1.5)
         
         test_results_path = self.get_path_to_results()
         output_file = os.path.join(test_results_path, "phiGRAPE-earth-sun2.svg")
         figure.savefig(output_file)
     
     instance.cleanup_code()
     instance.stop()
Exemple #43
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def new_gravity_code(converter, timestep=0.0025 | units.Myr):
    result = PhiGRAPE(converter)
    result.parameters.epsilon_squared = (0.01 | units.parsec)**2
    return result
Exemple #44
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 def test9(self):
     convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 149.5e6 | units.km)
     instance = PhiGRAPE(convert_nbody, **default_test_options)#, debugger="xterm")
     instance.initialize_code()
 
     instance.parameters.set_defaults()
     instance.parameters.initialize_gpu_once = 1
     
     stars = self.new_system_of_sun_and_earth()
     earth = stars[1]
 
     instance.particles.add_particles(stars)
     instance.commit_particles()
 
     instance.evolve_model(365 | units.day)
 
     instance.particles.copy_values_of_all_attributes_to(stars)
     
     position_at_start = earth.position.value_in(units.AU)[0]
     position_after_full_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(position_at_start, position_after_full_rotation, 6)
     
     instance.evolve_model(365.0 + (365.0 / 2) | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[0]
     self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 2)
             
     instance.evolve_model(365.0 + (365.0 / 2) + (365.0 / 4)  | units.day)
     
     instance.particles.copy_values_of_all_attributes_to(stars)
     position_after_half_a_rotation = earth.position.value_in(units.AU)[1]
     #self.assertAlmostEqual(-position_at_start, position_after_half_a_rotation, 3)
     
     instance.cleanup_code()
     
     instance.stop()
Exemple #45
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    sat_two = stars[2]
    sat_two.mass = units.kg(1000)
    sat_two.radius = units.m(10)
    sat_two.position = units.km(np.array((6371 + 242, 100.0, 0.0)))
    sat_two.velocity = units.ms(np.array((0.0, 27359 / 3.6, 0.0)))

    convert_nbody = nbody_system.nbody_to_si(5.9736e24 | units.kg,
                                             6371 | units.km)

    s = Viewer(stars, (640, 480), convert_nbody)

    #stars.scale_to_standard()
    if method == 'octgrav':
        gravity = Octgrav()
    elif method == 'phigrape':
        gravity = PhiGRAPE(convert_nbody)
    elif method == 'bhtree':
        gravity = BHTree(convert_nbody, number_of_workes=workers)
    elif method == 'hermite':
        gravity = Hermite(convert_nbody,
                          number_of_workers=workers
                          #debugger = "xterm",
                          #redirection = "none"
                          )
    gravity.initialize_code()
    gravity.parameters.epsilon_squared = 0.001 | nbody_system.length**2

    #stars.radius = 0.000001 | nbody_system.length
    gravity.particles.add_particles(stars)
    #gravity.stopping_conditions.pair_detection.enable()
    from_model_to_gravity = stars.new_channel_to(gravity.particles)
Exemple #46
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 def test8(self):
     particles = datamodel.Particles(6)
     particles.mass = nbody_system.mass.new_quantity(range(1,7))
     particles.radius =   0.00001 | nbody_system.length
     particles.position = [[-1.0,0.0,0.0],[1.0,0.0,0.0],[0.0,-1.0,0.0],[0.0,1.0,0.0],[0.0,0.0,-1.0],[0.0,0.0,1.0]] | nbody_system.length
     particles.velocity = [[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0],[0.0,0.0,0.0]] | nbody_system.speed
     
     for current_mode in ['g6lib','gpu','grape']:
         try:
             instance = PhiGRAPE(mode = current_mode)
         except:
             print "Running PhiGRAPE with mode=" + current_mode, "was unsuccessful."
         else:
             print "Running PhiGRAPE with mode=" + current_mode + "...",
             instance.initialize_code()
             instance.particles.add_particles(particles)
             instance.commit_particles()
             instance.evolve_model(0.1 | nbody_system.time)
             instance.cleanup_code()
             instance.stop()
             print "ok"
Exemple #47
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ZC = ZRES / 2.0

if __name__ == "__main__":

    nstars = int(sys.argv[1])
    workers = int(sys.argv[2])
    method = sys.argv[3]
    print nstars
    seed = None
    stars = new_plummer_model(
        nstars)  #, convert_nbody, random_state = seed).result

    if method == 'octgrav':
        gravity = Octgrav()
    elif method == 'phigrape':
        gravity = PhiGRAPE(PhiGRAPE.NBODY)
    elif method == 'bhtree':
        gravity = BHTree(number_of_workes=workers)
    elif method == 'hermite':
        gravity = Hermite(number_of_workers=workers
                          #debugger = "xterm",
                          #redirection = "none"
                          )
    gravity.initialize_code()
    gravity.parameters.epsilon_squared = 0.001 | nbody_system.length**2

    stars.radius = 0.000001 | nbody_system.length
    gravity.particles.add_particles(stars)
    gravity.stopping_conditions.pair_detection.enable()
    from_model_to_gravity = stars.new_channel_to(gravity.particles)
    from_gravity_to_model = gravity.particles.new_channel_to(stars)
Exemple #48
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if __name__ in ('__main__', '__plot__'):

    # set up parameters:
    N = 100
    W0 = 3
    Rinit = 50. | units.parsec
    timestep = 0.01 | units.Myr
    Mcluster = 4.e4 | units.MSun
    Rcluster = 0.7 | units.parsec
    converter = nbody_system.nbody_to_si(Mcluster,Rcluster)

    # create a globular cluster model
    particles = new_king_model(N, W0, convert_nbody=converter)
    particles.radius = 0.0| units.parsec
    cluster = PhiGRAPE(converter, parameters=[("epsilon_squared", (0.01 | units.parsec)**2)])

    # create the external potential of the Galaxy
    galaxy = Agama(converter, type="Dehnen", gamma=1.8, \
        rscale=1000.| units.parsec, mass=1.6e10 | units.MSun, channel_type='sockets')

    # shift the cluster to an orbit around Galactic center
    acc,_,_ = galaxy.get_gravity_at_point(0|units.kpc, Rinit, 0|units.kpc, 0|units.kpc)
    vcirc = (-acc * Rinit)**0.5
    print "Vcirc=", vcirc.value_in(units.kms), "km/s"
    particles.x  += Rinit
    particles.vy += vcirc
    cluster.particles.add_particles(particles)

    # set up bridge; cluster is evolved under influence of the galaxy
    sys = bridge(verbose=False)