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57 lines
1.9 KiB
Python
57 lines
1.9 KiB
Python
try:
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# Python 2.7: use the C pickle to speed up
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# test_concurrency_safe_write which pickles big python objects
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import cPickle as cpickle
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except ImportError:
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import pickle as cpickle
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import functools
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import time
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from joblib.testing import parametrize, timeout
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from joblib.test.common import with_multiprocessing
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from joblib.backports import concurrency_safe_rename
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from joblib import Parallel, delayed
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from joblib._store_backends import concurrency_safe_write
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def write_func(output, filename):
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with open(filename, 'wb') as f:
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cpickle.dump(output, f)
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def load_func(expected, filename):
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for i in range(10):
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try:
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with open(filename, 'rb') as f:
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reloaded = cpickle.load(f)
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break
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except (OSError, IOError):
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# On Windows you can have WindowsError ([Error 5] Access
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# is denied or [Error 13] Permission denied) when reading the file,
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# probably because a writer process has a lock on the file
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time.sleep(0.1)
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else:
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raise
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assert expected == reloaded
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def concurrency_safe_write_rename(to_write, filename, write_func):
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temporary_filename = concurrency_safe_write(to_write,
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filename, write_func)
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concurrency_safe_rename(temporary_filename, filename)
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@timeout(0) # No timeout as this test can be long
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@with_multiprocessing
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@parametrize('backend', ['multiprocessing', 'loky', 'threading'])
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def test_concurrency_safe_write(tmpdir, backend):
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# Add one item to cache
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filename = tmpdir.join('test.pkl').strpath
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obj = {str(i): i for i in range(int(1e5))}
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funcs = [functools.partial(concurrency_safe_write_rename,
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write_func=write_func)
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if i % 3 != 2 else load_func for i in range(12)]
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Parallel(n_jobs=2, backend=backend)(
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delayed(func)(obj, filename) for func in funcs)
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