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 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 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 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 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 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 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 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 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()