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 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 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 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.assertEqual(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 test8(self): particles = datamodel.Particles(6) particles.mass = nbody_system.mass.new_quantity(list(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 + "...", end=' ') 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")
def test1(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.initial_timestep_parameter = 0.001 instance.parameters.timestep_parameter = 0.001 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] instance.evolve_model(365 | units.day) 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, 2) 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()
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.assertEqual(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.assertEqual(len(instance.particles), 2) instance.particles.mass = [17.0, 33.0] | units.kg self.assertEqual(instance.get_mass(1), 17.0 | units.kg) self.assertEqual(instance.get_mass(2), 33.0 | units.kg) instance.stop()
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 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 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.assertEqual( 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 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()
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.assertEqual(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.assertEqual(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.assertEqual(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()
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
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()
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 = list(range( 1, number_of_particles + 1)) | nbody_system.mass particles.radius = 0.01 | nbody_system.length particles.x = list(range(number_of_particles)) | nbody_system.length particles.y = 0 | nbody_system.length particles.z = 0 | nbody_system.length particles.vx = list(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.assertEqual(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.assertEqual(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.assertEqual( len(instance.particles), initial_number_of_particles - number_of_deletes + i + 1) self.assertAlmostEqual( 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()
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
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()
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()
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 = [t_x[1].value_in(units.AU) for t_x in x_points] y_points_in_AU = [t_x1[1].value_in(units.AU) for t_x1 in 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()
def test2(self): instance = PhiGRAPE() self._run_addition_removal_test(instance)
def new_gravity_code(converter, timestep=0.0025 | units.Myr): result = PhiGRAPE(converter) result.parameters.epsilon_squared = (0.01 | units.parsec)**2 return result