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 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 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 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 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 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 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 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()
