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# Copyright 2012 Knowledge Economy Developments Ltd
#
# Henry Gomersall
# heng@kedevelopments.co.uk
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
from pyfftw import interfaces, builders
import numpy
import unittest
from .test_pyfftw_base import run_test_suites
from .test_pyfftw_numpy_interface import InterfacesNumpyFFTTestFFT
import threading
import time
'''Test the caching functionality of the interfaces package.
'''
class InterfacesNumpyFFTCacheTestFFT(InterfacesNumpyFFTTestFFT):
test_shapes = (
((100,), {}),
((128, 64), {'axis': 0}),
((128, 32), {'axis': -1}),
((32, 64), {}),
)
def validate(self, array_type, test_shape, dtype,
s, kwargs):
# Do it with the cache
interfaces.cache.enable()
output = self._validate(array_type, test_shape, dtype, s, kwargs)
output2 = self._validate(array_type, test_shape, dtype, s, kwargs)
self.assertIsNot(output, output2)
# Turn it off to finish
interfaces.cache.disable()
class CacheSpecificInterfacesUtils(unittest.TestCase):
def test_slow_lookup_no_race_condition(self):
'''Checks that lookups in _utils longer than the keepalive time are ok.
'''
# Any old size, it doesn't matter
data_shape = (128,)
# Monkey patch the module with a custom _Cache object
_Cache_class = interfaces.cache._Cache
class _SlowLookupCache(_Cache_class):
def _lookup(self, key):
return _Cache_class.lookup(self, key)
def lookup(self, key):
time.sleep(0.1)
return self._lookup(key)
try:
interfaces.cache._Cache = _SlowLookupCache
interfaces.cache.enable()
# something shortish
interfaces.cache.set_keepalive_time(0.001)
ar, ai = numpy.random.randn(*(2,) + data_shape)
a = ar + 1j*ai
# Both the following should work without exception
# (even if it fails to get from the cache)
interfaces.numpy_fft.fft(a)
interfaces.numpy_fft.fft(a)
interfaces.cache.disable()
finally:
# Revert the monkey patching
interfaces.cache._Cache = _Cache_class
class InterfacesCacheTest(unittest.TestCase):
def test_missing_threading(self):
self.assertIs(interfaces.cache._fftw_cache, None)
mod_threading = interfaces.cache._threading
interfaces.cache._threading = None
with self.assertRaises(ImportError):
interfaces.cache.enable()
interfaces.cache._threading = mod_threading
def test_is_enabled(self):
self.assertIs(interfaces.cache._fftw_cache, None)
interfaces.cache.enable()
self.assertTrue(interfaces.cache.is_enabled())
interfaces.cache.disable()
self.assertFalse(interfaces.cache.is_enabled())
def test_cache_enable_disable(self):
self.assertIs(interfaces.cache._fftw_cache, None)
interfaces.cache.enable()
self.assertIsInstance(
interfaces.cache._fftw_cache, interfaces.cache._Cache)
interfaces.cache.disable()
self.assertIs(interfaces.cache._fftw_cache, None)
def test_set_keepalive_time(self):
with self.assertRaises(interfaces.cache.CacheError):
interfaces.cache.set_keepalive_time(10)
interfaces.cache.enable()
interfaces.cache.set_keepalive_time(10)
self.assertTrue(
interfaces.cache._fftw_cache.keepalive_time == 10.0)
interfaces.cache.disable()
class CacheTest(unittest.TestCase):
def test_cache_parent_thread_ended(self):
'''Test ending cache parent thread ends cache thread.
'''
self.assertTrue(threading.active_count() == 1)
def cache_parent_thread():
cache = interfaces.cache._Cache()
time.sleep(0.2)
parent_t = threading.Thread(target=cache_parent_thread)
parent_t.start()
time.sleep(0.1)
# Check it's running
self.assertTrue(threading.active_count() == 3)
parent_t.join()
time.sleep(0.1)
# Check both threads have exited properly
self.assertTrue(threading.active_count() == 1)
def test_delete_cache_object(self):
'''Test deleting a cache object ends cache thread.
'''
self.assertTrue(threading.active_count() == 1)
_cache = interfaces.cache._Cache()
time.sleep(0.1)
self.assertTrue(threading.active_count() == 2)
del _cache
time.sleep(0.1)
self.assertTrue(threading.active_count() == 1)
def test_insert_and_lookup_item(self):
_cache = interfaces.cache._Cache()
key = 'the key'
test_array = numpy.random.randn(16)
obj = builders.fft(test_array)
_cache.insert(obj, key)
self.assertIs(_cache.lookup(key), obj)
def test_invalid_lookup(self):
_cache = interfaces.cache._Cache()
key = 'the key'
test_array = numpy.random.randn(16)
obj = builders.fft(test_array)
_cache.insert(obj, key)
self.assertRaises(KeyError, _cache.lookup, 'wrong_key')
def test_keepalive_time_update(self):
_cache = interfaces.cache._Cache()
# The default
self.assertEqual(_cache.keepalive_time, 0.1)
_cache.set_keepalive_time(0.3)
self.assertEqual(_cache.keepalive_time, 0.3)
_cache.set_keepalive_time(10.0)
self.assertEqual(_cache.keepalive_time, 10.0)
_cache.set_keepalive_time('0.2')
self.assertEqual(_cache.keepalive_time, 0.2)
with self.assertRaises(ValueError):
_cache.set_keepalive_time('foo')
with self.assertRaises(TypeError):
_cache.set_keepalive_time([])
def test_contains(self):
_cache = interfaces.cache._Cache()
key = 'the key'
test_array = numpy.random.randn(16)
obj = builders.fft(test_array)
_cache.insert(obj, key)
self.assertTrue(key in _cache)
self.assertFalse('Not a key' in _cache)
def test_objects_removed_after_keepalive(self):
_cache = interfaces.cache._Cache()
key = 'the key'
test_array = numpy.random.randn(16)
obj = builders.fft(test_array)
_cache.insert(obj, key)
self.assertIs(_cache.lookup(key), obj)
keepalive_time = _cache.keepalive_time
time.sleep(_cache.keepalive_time*3)
self.assertRaises(KeyError, _cache.lookup, key)
_cache.insert(obj, key)
old_keepalive_time = _cache.keepalive_time
_cache.set_keepalive_time(old_keepalive_time * 4)
self.assertIs(_cache.lookup(key), obj)
time.sleep(old_keepalive_time * 3)
self.assertIs(_cache.lookup(key), obj)
time.sleep(old_keepalive_time * 8)
self.assertRaises(KeyError, _cache.lookup, key)
class InterfacesNumpyFFTCacheTestIFFT(InterfacesNumpyFFTCacheTestFFT):
func = 'ifft'
class InterfacesNumpyFFTCacheTestRFFT(InterfacesNumpyFFTCacheTestFFT):
func = 'rfft'
class InterfacesNumpyFFTCacheTestIRFFT(InterfacesNumpyFFTCacheTestFFT):
func = 'irfft'
realinv = True
class InterfacesNumpyFFTCacheTestFFT2(InterfacesNumpyFFTCacheTestFFT):
axes_kw = 'axes'
func = 'ifft2'
test_shapes = (
((128, 64), {'axes': None}),
((128, 32), {'axes': None}),
((32, 64), {'axes': (-2, -1)}),
((4, 6, 8, 4), {'axes': (0, 3)}),
)
invalid_args = (
((100,), ((100, 200),), ValueError, 'Shape error'),
((100, 200), ((100, 200, 100),), ValueError, 'Shape error'),
((100,), ((100, 200), (-3, -2, -1)), ValueError, 'Shape error'),
((100, 200), (100, -1), TypeError, ''),
((100, 200), ((100, 200), (-3, -2)), IndexError, 'Invalid axes'),
((100, 200), ((100,), (-3,)), IndexError, 'Invalid axes'))
class InterfacesNumpyFFTCacheTestIFFT2(InterfacesNumpyFFTCacheTestFFT2):
func = 'ifft2'
class InterfacesNumpyFFTCacheTestRFFT2(InterfacesNumpyFFTCacheTestFFT2):
func = 'rfft2'
class InterfacesNumpyFFTCacheTestIRFFT2(InterfacesNumpyFFTCacheTestFFT2):
func = 'irfft2'
realinv = True
class InterfacesNumpyFFTCacheTestFFTN(InterfacesNumpyFFTCacheTestFFT2):
func = 'ifftn'
test_shapes = (
((128, 32, 4), {'axes': None}),
((64, 128, 16), {'axes': (0, 1, 2)}),
((4, 6, 8, 4), {'axes': (0, 3, 1)}),
((4, 6, 8, 4), {'axes': (0, 3, 1, 2)}),
)
class InterfacesNumpyFFTCacheTestIFFTN(InterfacesNumpyFFTCacheTestFFTN):
func = 'ifftn'
class InterfacesNumpyFFTCacheTestRFFTN(InterfacesNumpyFFTCacheTestFFTN):
func = 'rfftn'
class InterfacesNumpyFFTCacheTestIRFFTN(InterfacesNumpyFFTCacheTestFFTN):
func = 'irfftn'
realinv = True
test_cases = (
CacheTest,
InterfacesCacheTest,
CacheSpecificInterfacesUtils,
InterfacesNumpyFFTCacheTestFFT,
InterfacesNumpyFFTCacheTestIFFT,
InterfacesNumpyFFTCacheTestRFFT,
InterfacesNumpyFFTCacheTestIRFFT,
InterfacesNumpyFFTCacheTestFFT2,
InterfacesNumpyFFTCacheTestIFFT2,
InterfacesNumpyFFTCacheTestRFFT2,
InterfacesNumpyFFTCacheTestIRFFT2,
InterfacesNumpyFFTCacheTestFFTN,
InterfacesNumpyFFTCacheTestIFFTN,
InterfacesNumpyFFTCacheTestRFFTN,
InterfacesNumpyFFTCacheTestIRFFTN,)
test_set = None
if __name__ == '__main__':
run_test_suites(test_cases, test_set)
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