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test_brutus.py
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test_brutus.py
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import os
import os.path
import math
from amuse.community import *
from amuse.test.amusetest import TestWithMPI
from amuse.units import units, nbody_system, constants
from amuse.datamodel import Particles
from amuse.community.brutus.interface import BrutusInterface, Brutus
class TestBrutusInterface(TestWithMPI):
def test1(self):
print "Test BrutusInterface initialization"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
self.assertEquals(0, instance.set_brutus_output_directory(instance.output_directory))
self.assertEquals(0, instance.commit_parameters())
self.assertEquals(0, instance.cleanup_code())
instance.stop()
def test2(self):
print "Test BrutusInterface new_particle / get_state"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
self.assertEquals(0, instance.set_brutus_output_directory(instance.output_directory))
self.assertEquals(0, instance.commit_parameters())
id, error = instance.new_particle(mass = 11.0, radius = 2.0, x = 0.0, y = 0.0, z = 0.0, vx = 0.0, vy = 0.0, vz = 0.0)
self.assertEquals(0, error)
self.assertEquals(0, id)
id, error = instance.new_particle(mass = 21.0, radius = 5.0, x = 10.0, y = 0.0, z = 0.0, vx = 10.0, vy = 0.0, vz = 0.0)
self.assertEquals(0, error)
self.assertEquals(1, id)
self.assertEquals(0, instance.commit_particles())
retrieved_state1 = instance.get_state(0)
retrieved_state2 = instance.get_state(1)
self.assertEquals(0, retrieved_state1['__result'])
self.assertEquals(0, retrieved_state2['__result'])
self.assertEquals(11.0, retrieved_state1['mass'])
self.assertEquals(21.0, retrieved_state2['mass'])
self.assertEquals( 0.0, retrieved_state1['x'])
self.assertEquals(10.0, retrieved_state2['x'])
self.assertEquals(0, instance.cleanup_code())
instance.stop()
def test4(self):
print "Test BrutusInterface particle property getters/setters"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
self.assertEquals(0, instance.set_brutus_output_directory(instance.output_directory))
self.assertEquals(0, instance.commit_parameters())
self.assertEquals([0, 0], instance.new_particle(0.01, 1, 0, 0, 0, 1, 0, 0.1).values())
self.assertEquals([1, 0], instance.new_particle(0.02, -1, 0, 0, 0,-1, 0, 0.1).values())
self.assertEquals(0, instance.commit_particles())
# getters
mass, result = instance.get_mass(0)
self.assertAlmostEquals(0.01, mass)
self.assertEquals(0,result)
radius, result = instance.get_radius(1)
self.assertAlmostEquals(0.1, radius)
self.assertEquals(0,result)
#self.assertEquals(-3, instance.get_mass(2)['__result']) # Particle not found
self.assertEquals([ 1, 0, 0, 0], instance.get_position(0).values())
self.assertEquals([-1, 0, 0, 0], instance.get_position(1).values())
self.assertEquals([ 0, 1, 0, 0], instance.get_velocity(0).values())
self.assertEquals([ 0,-1, 0, 0], instance.get_velocity(1).values())
# setters
self.assertEquals(0, instance.set_state(0, 0.01, 1,2,3, 4,5,6, 0.1))
self.assertEquals([0.01, 1.0,2.0,3.0, 4.0,5.0,6.0, 0.1, 0], instance.get_state(0).values())
self.assertEquals(0, instance.set_mass(0, 0.02))
self.assertEquals([0.02, 1.0,2.0,3.0, 4.0,5.0,6.0, 0.1, 0], instance.get_state(0).values())
self.assertEquals(0, instance.set_radius(0, 0.2))
self.assertEquals([0.02, 1.0,2.0,3.0, 4.0,5.0,6.0, 0.2, 0], instance.get_state(0).values())
self.assertEquals(0, instance.set_position(0, 10,20,30))
self.assertEquals([0.02, 10.0,20.0,30.0, 4.0,5.0,6.0, 0.2, 0], instance.get_state(0).values())
self.assertEquals(0, instance.set_velocity(0, 40,50,60))
self.assertEquals([0.02, 10.0,20.0,30.0, 40.0,50.0,60.0, 0.2, 0], instance.get_state(0).values())
self.assertEquals(0, instance.cleanup_code())
instance.stop()
def test5(self):
print "Test BrutusInterface parameters"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
# word length
self.assertEquals([64, 0], instance.get_word_length().values())
self.assertEquals(0, instance.set_word_length(80))
self.assertEquals([80, 0], instance.get_word_length().values())
# bs tolerance, default (double) implementation
self.assertEquals([1.0e-6, 0], instance.get_bs_tolerance().values())
self.assertEquals(0, instance.set_bs_tolerance(1.0e-8))
self.assertEquals([1.0e-8, 0], instance.get_bs_tolerance().values())
# bs tolerance, string implementation for values requiring higher precision (note: actual accuracy depends on word_length)
#self.assertEquals(1e-8, eval(instance.get_bs_tolerance_string()[""]))
#self.assertEquals(0, instance.set_bs_tolerance_string("1e-10"))
#self.assertEquals(["1e-10", 0], instance.get_bs_tolerance_string().values())
# eta, float64
self.assertEquals([0.24, 0], instance.get_eta().values())
self.assertEquals(0, instance.set_eta(0.10))
self.assertEquals([0.10, 0], instance.get_eta().values())
# eta, string
#self.assertEquals(["0.10", 0], instance.get_eta_string().values())
self.assertEquals(0, instance.set_eta_string("0.20"))
self.assertEquals(["0.2", 0], instance.get_eta_string().values())
# output dir
#self.assertEquals(["./", 0], instance.get_brutus_output_directory().values())
self.assertEquals(0, instance.set_brutus_output_directory("./out"))
self.assertEquals(["./out/", 0], instance.get_brutus_output_directory().values())
self.assertEquals(0, instance.set_brutus_output_directory(instance.output_directory))
self.assertEquals([instance.output_directory+"/", 0], instance.get_brutus_output_directory().values())
self.assertEquals(0, instance.commit_parameters())
self.assertEquals(0, instance.cleanup_code())
instance.stop()
def test6(self):
print "Test BrutusInterface evolve_model, equal-mass binary"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
self.assertEquals(0, instance.set_bs_tolerance(1.0e-10))
self.assertEquals(0, instance.set_word_length(72))
self.assertEquals(0, instance.commit_parameters())
self.assertEquals([0, 0], instance.new_particle(0.5, 0.5, 0, 0, 0, 0.5, 0).values())
self.assertEquals([1, 0], instance.new_particle(0.5, -0.5, 0, 0, 0,-0.5, 0).values())
self.assertEquals(0, instance.commit_particles())
self.assertEquals(0, instance.evolve_model(math.pi)) # half an orbit
for result, expected in zip(instance.get_position(0).values(), [-0.5, 0.0, 0.0, 0]):
self.assertAlmostEquals(result, expected, 5)
self.assertEquals(0, instance.evolve_model(2 * math.pi)) # full orbit
for result, expected in zip(instance.get_position(0).values(), [0.5, 0.0, 0.0, 0]):
self.assertAlmostEquals(result, expected, 5)
self.assertEquals(0, instance.cleanup_code())
instance.stop()
def test7(self):
print "Test BrutusInterface evolve_model, pythagorean problem"
instance = self.new_instance_of_an_optional_code(BrutusInterface)
self.assertEquals(0, instance.initialize_code())
self.assertEquals(0, instance.set_bs_tolerance(1.0e-6))
self.assertEquals(0, instance.set_word_length(56))
self.assertEquals(0, instance.commit_parameters())
self.assertEquals([0, 0], instance.new_particle("3", "1", "3", "0", "0", "0", "0").values())
self.assertEquals([1, 0], instance.new_particle("4", "-2", "-1", "0", "0", "0", "0").values())
self.assertEquals([2, 0], instance.new_particle("5", "1", "-1", "0", "0", "0", "0").values())
self.assertEquals(0, instance.commit_particles())
self.assertEquals(0, instance.evolve_model(10))
## add a check for assertequal final coordinates
for result, expected in zip(instance.get_position(0).values(), [0.778480410138085492274810667212415, 0.141392300290086165745727207379442, 0, 0]):
self.assertAlmostEquals(result, expected, 3)
self.assertEquals(0, instance.cleanup_code())
instance.stop()
class TestBrutus(TestWithMPI):
def new_sun_earth_system(self):
particles = Particles(2)
particles.mass = [1.0, 3.0037e-6] | units.MSun
particles.radius = 1.0 | units.RSun
particles.position = [[0.0, 0.0, 0.0], [1.0, 0.0, 0.0]] | units.AU
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.km / units.s
particles[1].vy = (constants.G * particles.total_mass() / (1.0 | units.AU)).sqrt()
return particles
def test1(self):
print "Testing Brutus initialization"
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 1.0 | units.AU)
instance = self.new_instance_of_an_optional_code(Brutus, convert_nbody)
instance.initialize_code()
instance.commit_parameters()
instance.cleanup_code()
instance.stop()
def test2(self):
print "Testing Brutus parameters"
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 1.0 | units.AU)
instance = self.new_instance_of_an_optional_code(Brutus,convert_nbody)
instance.initialize_code()
# print instance.parameters
self.assertEquals(instance.parameters.bs_tolerance, 1.0e-6)
instance.parameters.bs_tolerance = 1.0e-9
self.assertEquals(instance.parameters.bs_tolerance, 1.0e-9)
self.assertEquals(instance.parameters.word_length, 64)
instance.parameters.word_length = 128
self.assertEquals(instance.parameters.word_length, 128)
self.assertEquals(instance.parameters.dt_param, 0.24)
instance.parameters.dt_param = 0.10
self.assertEquals(instance.parameters.dt_param, 0.10)
self.assertEquals(instance.parameters.brutus_output_directory, instance.output_directory + os.sep)
instance.parameters.brutus_output_directory = "./out"
self.assertEquals(instance.parameters.brutus_output_directory, "./out/")
instance.parameters.brutus_output_directory = instance.output_directory
self.assertEquals(instance.parameters.brutus_output_directory, instance.output_directory + os.sep)
instance.cleanup_code()
instance.stop()
def test3(self):
print "Testing Brutus particles"
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 1.0 | units.AU)
instance = self.new_instance_of_an_optional_code(Brutus,convert_nbody)
instance.initialize_code()
instance.commit_parameters()
instance.particles.add_particles(self.new_sun_earth_system())
instance.commit_particles()
self.assertAlmostEquals(instance.particles.mass, [1.0, 3.0037e-6] | units.MSun)
self.assertAlmostEquals(instance.particles.radius, 1.0 | units.RSun)
self.assertAlmostEquals(instance.particles.position,
[[0.0, 0.0, 0.0], [1.0, 0.0, 0.0]] | units.AU)
self.assertAlmostEquals(instance.particles.velocity,
[[0.0, 0.0, 0.0], [0.0, 29.7885, 0.0]] | units.km / units.s, 3)
instance.cleanup_code()
instance.stop()
def test4(self):
print "Testing Brutus evolve_model, 2 particles"
particles = Particles(2)
particles.mass = 0.5 | units.MSun
particles.radius = 1.0 | units.RSun
particles.position = [[0.0, 0.0, 0.0], [1.0, 0.0, 0.0]] | units.AU
particles.velocity = [[0.0, 0.0, 0.0], [0.0, 0.0, 0.0]] | units.km / units.s
particles[1].vy = (constants.G * (1.0 | units.MSun) / (1.0 | units.AU)).sqrt()
particles.move_to_center()
convert_nbody = nbody_system.nbody_to_si(1.0 | units.MSun, 1.0 | units.AU)
instance = self.new_instance_of_an_optional_code(Brutus, convert_nbody)
instance.initialize_code()
instance.parameters.bs_tolerance = 1e-6
instance.parameters.word_length = 56
instance.commit_parameters()
instance.particles.add_particles(particles)
instance.commit_particles()
primary = instance.particles[0]
P = 2 * math.pi * primary.x / primary.vy
position_at_start = primary.position.x
instance.evolve_model(P / 4.0)
self.assertAlmostRelativeEqual(position_at_start, primary.position.y, 6)
instance.evolve_model(P / 2.0)
self.assertAlmostRelativeEqual(position_at_start, -primary.position.x, 6)
instance.evolve_model(P)
self.assertAlmostRelativeEqual(position_at_start, primary.position.x, 6)
instance.cleanup_code()
instance.stop()