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import multiprocessing
import os
import sys
import tempfile
import unittest
import testlib
import mitogen.parent
import ansible_mitogen.affinity
class NullFixedPolicy(ansible_mitogen.affinity.FixedPolicy):
def _set_cpu_mask(self, mask):
self.mask = mask
@unittest.skipIf(
reason='Linux only',
condition=(not os.uname()[0] == 'Linux')
)
class FixedPolicyTest(testlib.TestCase):
klass = NullFixedPolicy
def test_assign_controller_1core(self):
# Uniprocessor .
policy = self.klass(cpu_count=1)
policy.assign_controller()
self.assertEqual(0x1, policy.mask)
def test_assign_controller_2core(self):
# Small SMP gets 1.. % cpu_count
policy = self.klass(cpu_count=2)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
policy.assign_controller()
def test_assign_controller_3core(self):
# Small SMP gets 1.. % cpu_count
policy = self.klass(cpu_count=3)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
policy.assign_controller()
self.assertEqual(0x4, policy.mask)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
policy.assign_controller()
self.assertEqual(0x4, policy.mask)
policy.assign_controller()
def test_assign_controller_4core(self):
# Big SMP gets a dedicated core.
policy = self.klass(cpu_count=4)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
policy.assign_controller()
self.assertEqual(0x2, policy.mask)
def test_assign_muxprocess_1core(self):
# Uniprocessor .
policy = self.klass(cpu_count=1)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
def test_assign_muxprocess_2core(self):
# Small SMP gets dedicated core.
policy = self.klass(cpu_count=2)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
policy.assign_muxprocess(0)
def test_assign_muxprocess_3core(self):
# Small SMP gets a dedicated core.
policy = self.klass(cpu_count=3)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
def test_assign_muxprocess_4core(self):
# Big SMP gets a dedicated core.
policy = self.klass(cpu_count=4)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
policy.assign_muxprocess(0)
self.assertEqual(0x1, policy.mask)
def test_assign_worker_1core(self):
# Balance n % 1
policy = self.klass(cpu_count=1)
policy.assign_worker()
self.assertEqual(0x1, policy.mask)
policy.assign_worker()
self.assertEqual(0x1, policy.mask)
def test_assign_worker_2core(self):
# Balance n % 1
policy = self.klass(cpu_count=2)
policy.assign_worker()
self.assertEqual(0x2, policy.mask)
policy.assign_worker()
self.assertEqual(0x2, policy.mask)
def test_assign_worker_3core(self):
# Balance n % 1
policy = self.klass(cpu_count=3)
policy.assign_worker()
self.assertEqual(0x2, policy.mask)
policy.assign_worker()
self.assertEqual(0x4, policy.mask)
policy.assign_worker()
self.assertEqual(0x2, policy.mask)
def test_assign_worker_4core(self):
# Balance n % 1
policy = self.klass(cpu_count=4)
policy.assign_worker()
self.assertEqual(4, policy.mask)
policy.assign_worker()
self.assertEqual(8, policy.mask)
policy.assign_worker()
self.assertEqual(4, policy.mask)
def test_assign_subprocess_1core(self):
# allow all except reserved.
policy = self.klass(cpu_count=1)
policy.assign_subprocess()
self.assertEqual(0x1, policy.mask)
policy.assign_subprocess()
self.assertEqual(0x1, policy.mask)
def test_assign_subprocess_2core(self):
# allow all except reserved.
policy = self.klass(cpu_count=2)
policy.assign_subprocess()
self.assertEqual(0x2, policy.mask)
policy.assign_subprocess()
self.assertEqual(0x2, policy.mask)
def test_assign_subprocess_3core(self):
# allow all except reserved.
policy = self.klass(cpu_count=3)
policy.assign_subprocess()
self.assertEqual(0x2 + 0x4, policy.mask)
policy.assign_subprocess()
self.assertEqual(0x2 + 0x4, policy.mask)
def test_assign_subprocess_4core(self):
# allow all except reserved.
policy = self.klass(cpu_count=4)
policy.assign_subprocess()
self.assertEqual(0x4 + 0x8, policy.mask)
policy.assign_subprocess()
self.assertEqual(0x4 + 0x8, policy.mask)
@unittest.skipIf(
reason='Linux/SMP only',
condition=(not (
os.uname()[0] == 'Linux' and
multiprocessing.cpu_count() > 2
))
)
class LinuxPolicyTest(testlib.TestCase):
klass = ansible_mitogen.affinity.LinuxPolicy
def setUp(self):
self.policy = self.klass()
def _get_cpus(self, path='/proc/self/status'):
fp = open(path)
try:
for line in fp:
if line.startswith('Cpus_allowed'):
mask = line.split()[1].replace(',', '')
return int(mask, 16)
finally:
fp.close()
def test_set_cpu_mask(self):
self.policy._set_cpu_mask(0x1)
self.assertEqual(0x1, self._get_cpus())
self.policy._set_cpu_mask(0x2)
self.assertEqual(0x2, self._get_cpus())
self.policy._set_cpu_mask(0x3)
self.assertEqual(0x3, self._get_cpus())
def test_clear_on_popen(self):
tf = tempfile.NamedTemporaryFile()
try:
before = self._get_cpus()
self.policy._set_cpu(None, 3)
my_cpu = self._get_cpus()
proc = mitogen.parent.popen(
args=['cp', '/proc/self/status', tf.name]
)
proc.wait()
his_cpu = self._get_cpus(tf.name)
self.assertNotEqual(my_cpu, his_cpu)
self.policy._clear()
finally:
tf.close()
class MockLinuxPolicyTest(testlib.TestCase):
klass = ansible_mitogen.affinity.LinuxPolicy
# Test struct.pack() in _set_cpu_mask().
def test_high_cpus(self):
policy = self.klass(cpu_count=4096)
for x in range(1, 4096, 32):
policy.assign_subprocess()
MockLinuxPolicyTest = unittest.skipIf(
condition=(not sys.platform.startswith('linuxPolicy')),
reason='select.select() not supported'
)(MockLinuxPolicyTest)
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