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提交 753ad528 authored 作者: Arnaud Bergeron's avatar Arnaud Bergeron
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Change the ModuleCache to only take the lock for actual compilation.

Also, once we acquire the lock do a refresh of the cache and try to pick up modules compiled by others.
上级 34a15a3f
隐藏空白字符变更
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正在显示 包含 187 行增加 和 220 行删除
theano/gof/cmodule.py
浏览文件 @ 753ad528
......@@ -617,6 +617,16 @@ class ModuleCache(object):
Older modules will be deleted in ``clear_old``.
"""
def _get_module(self, name):
if name not in self.module_from_name:
_logger.debug('loading name %s', name)
self.module_from_name[name] = dlimport(name)
self.stats[1] += 1
else:
_logger.debug('returning compiled module from cache %s', name)
self.stats[0] += 1
return self.module_from_name[name]
def refresh(self, age_thresh_use=None, delete_if_problem=False):
"""Update cache data by walking the cache directory structure.
......@@ -877,243 +887,200 @@ class ModuleCache(object):
return too_old_to_use
def module_from_key(self, key, fn=None, keep_lock=False, key_data=None):
def _get_from_key(self, key, key_data=None):
"""
:param fn: A callable object that will return an iterable object when
called, such that the first element in this iterable object is the
source code of the module, and the last element is the module itself.
`fn` is called only if the key is not already in the cache, with
a single keyword argument `location` that is the path to the directory
where the module should be compiled.
Returns a module if the passed-in key is found in the cache
and None otherwise.
:param key_data: If not None, it should be a KeyData object and the
key parameter should be None. In this case, we use the info from the
KeyData object to recover the module, rather than the key itself. Note
that this implies the module already exists (and may or may not have
already been loaded).
May raise ValueError if the key is malformed.
"""
# We should only use one of the two ways to get a module.
assert key_data is None or key is None
rval = None
name = None
if key is not None:
assert key_data is None
try:
_version, _rest = key
except (TypeError, ValueError):
raise ValueError(
"Invalid key. key must have form (version, rest)", key)
name = None
if key is not None and key in self.entry_from_key:
# We have seen this key either in this process or previously.
name = self.entry_from_key[key]
elif key_data is not None:
name = key_data.get_entry()
if name is not None:
# This is an existing module we can recover.
if name not in self.module_from_name:
_logger.debug('loading name %s', name)
self.module_from_name[name] = dlimport(name)
self.stats[1] += 1
else:
self.stats[0] += 1
_logger.debug('returning compiled module from cache %s', name)
rval = self.module_from_name[name]
"Invalid key. key must have form (version, rest)", key)
if name in self.entry_from_key:
name = self.entry_from_key[key]
else:
hash_key = hash(key)
key_data = None
# We have never seen this key before.
# We acquire the lock later only if we were able to
# generate C code. Otherwise, we would take the lock for ops
# that have only a perform().
assert key_data is not None
name = key_data.get_entry()
if name is None:
return None
return self._get_module(name)
def _get_from_hash(self, module_hash, key, keep_lock=False):
if module_hash in self.module_hash_to_key_data:
_logger.debug("Duplicated module! Will re-use the "
"previous one")
key_data = self.module_hash_to_key_data[module_hash]
module = self._get_from_key(None, key_data)
lock_taken = False
# This try/finally block ensures that the lock is released once we
# are done writing in the cache file or after raising an exception.
try:
# Embedding two try statements for Python 2.4 compatibility
# (cannot do try / except / finally).
try:
location = dlimport_workdir(self.dirname)
except OSError, e:
_logger.error(e)
if e.errno == 31:
_logger.error('There are %i files in %s',
len(os.listdir(config.compiledir)),
config.compiledir)
raise
compilelock.get_lock()
lock_taken = True
key_data.add_key(key, save_pkl=bool(key[0]))
key_broken = False
except cPickle.PicklingError:
key_data.remove_key(key)
key_broken = True
finally:
if lock_taken and not keep_lock:
compilelock.release_lock()
if (key[0] and not key_broken and
self.check_for_broken_eq):
self.check_key(key, key_data.key_pkl)
self._update_mappings(key, key_data, module.__file__)
return module
else:
return None
def _update_mappings(self, key, key_data, name):
all_keys = key_data.keys
if not all_keys:
all_keys = [key]
assert key in all_keys
for k in all_keys:
if k in self.entry_from_key:
assert self.entry_from_key[k] == name
else:
self.entry_from_key[k] = name
if key[0]:
self.similar_keys.setdefault(get_safe_part(k),
[]).append(key)
def _compile_code(self, compile_steps):
"""
Compiles the passed-in source code.
This expects that the compile lock is held during the call.
"""
location = None
try:
location = dlimport_workdir(self.dirname)
except OSError, e:
_logger.error(e)
if e.errno == 31:
_logger.error('There are %i files in %s',
len(os.listdir(config.compiledir)),
config.compiledir)
raise
try:
while True:
try:
compile_steps = fn(location=location).__iter__()
# Check if we already know a module with the same hash.
# If we do, then there is no need to even compile it.
duplicated_module = False
# The first compilation step is to yield the source code.
src_code = next(compile_steps)
module_hash = get_module_hash(src_code, key)
# The op has c_code, so take the lock.
compilelock.get_lock()
lock_taken = True
if not os.path.exists(location):
# Temporary fix, we should make sure it don't
# get deleted by the clear*() fct.
os.makedirs(location)
if module_hash in self.module_hash_to_key_data:
_logger.debug("Duplicated module! Will re-use the "
"previous one")
duplicated_module = True
# Load the already existing module.
key_data = self.module_hash_to_key_data[module_hash]
# Note that we do not pass the `fn` argument, since it
# should not be used considering that the module should
# already be compiled.
module = self.module_from_key(key=None,
key_data=key_data)
name = module.__file__
# Add current key to the set of keys associated to the
# same module. We only save the KeyData object of
# versioned modules.
try:
key_data.add_key(key, save_pkl=bool(_version))
key_broken = False
except cPickle.PicklingError:
# This should only happen if we tried to save the
# pickled file.
assert _version
# The key we are trying to add is broken: we will
# not add it after all.
key_data.remove_key(key)
key_broken = True
if (_version and not key_broken and
self.check_for_broken_eq):
self.check_key(key, key_data.key_pkl)
# We can delete the work directory.
_rmtree(location, ignore_nocleanup=True,
msg='temporary workdir of duplicated module')
# The module should be returned by the last
# step of the compilation.
module = next(compile_steps)
except StopIteration:
break
name = module.__file__
assert name.startswith(location)
assert name not in self.module_from_name
return module
except Exception:
_rmtree(location, ignore_if_missing=True,
msg='exception during compilation')
raise
else:
# Will fail if there is an error compiling the C code.
# The exception will be caught and the work dir will be
# deleted.
while True:
try:
# The module should be returned by the last
# step of the compilation.
module = next(compile_steps)
except StopIteration:
break
# Obtain path to the '.so' module file.
name = module.__file__
_logger.debug("Adding module to cache %s %s",
key, name)
assert name.startswith(location)
assert name not in self.module_from_name
# Changing the hash of the key is not allowed during
# compilation. That is the only cause found that makes
# the following assert fail.
assert hash(key) == hash_key
assert key not in self.entry_from_key
key_pkl = os.path.join(location, 'key.pkl')
assert not os.path.exists(key_pkl)
key_data = KeyData(
keys=set([key]),
module_hash=module_hash,
key_pkl=key_pkl,
entry=name)
# Note that we only save KeyData objects associated to
# versioned modules. So for unversioned key, the
# `key_pkl` field of the KeyData object will be a
# non-existing file (which does not matter since it
# will not be accessed).
if _version:
try:
key_data.save_pkl()
key_broken = False
except cPickle.PicklingError:
key_broken = True
# Remove key from the KeyData object, to make
# sure we never try to save it again.
# We still keep the KeyData object and save it
# so that the module can be re-used in the
# future.
key_data.keys = set()
key_data.save_pkl()
if not key_broken and self.check_for_broken_eq:
self.check_key(key, key_pkl)
# Adding the KeyData file to this set means it is a
# versioned module.
self.loaded_key_pkl.add(key_pkl)
elif config.cmodule.warn_no_version:
key_flat = flatten(key)
ops = [k for k in key_flat
if isinstance(k, theano.Op)]
_logger.warning("not all the"
" following op(s) implement"
" c_code_cache_version(). This makes them"
" recompiled for each process." + str(ops))
# Map the new module to its KeyData object. Note that
# we need to do it regardless of whether the key is
# versioned or not if we want to be able to re-use this
# module inside the same process.
self.module_hash_to_key_data[module_hash] = key_data
def _add_to_cache(self, module, key, module_hash):
"""
This function expects the compile lock to be held.
"""
name = module.__file__
_logger.debug("Adding module to cache %s %s",
key, name)
# Changing the hash of the key is not allowed during
# compilation. That is the only cause found that makes
# the following assert fail.
assert key not in self.entry_from_key
key_pkl = os.path.join(location, 'key.pkl')
assert not os.path.exists(key_pkl)
key_data = KeyData(
keys=set([key]),
module_hash=module_hash,
key_pkl=key_pkl,
entry=name)
if key[0]:
try:
key_data.save_pkl()
key_broken = False
except cPickle.PicklingError:
key_broken = True
key_data.remove_key(key)
key_data.save_pkl()
if not key_broken and self.check_for_broken_eq:
self.check_key(key, key_pkl)
self.loaded_key_pkl.add(key_pkl)
elif config.cmodule.warn_no_version:
key_flat = flatten(key)
ops = [k for k in key_flat if isinstance(k, theano.Op)]
_logger.warning("not all the"
" following op(s) implement"
" c_code_cache_version(). This makes them"
" recompiled for each process." + str(ops))
self._update_mappings(key, key_data, module)
return key_data
def module_from_key(self, key, fn=None, keep_lock=False):
"""
:param fn: A callable object that will return an iterable object when
called, such that the first element in this iterable object is the
source code of the module, and the last element is the module itself.
`fn` is called only if the key is not already in the cache, with
a single keyword argument `location` that is the path to the directory
where the module should be compiled.
"""
# Is the module in the cache?
module = self._get_from_key(key)
if module is not None:
return module
# Is the source code already in the cache?
compile_steps = fn(location=location).__iter__()
src_code = next(compile_steps)
module_hash = get_module_hash(src_code, key)
module = self._get_from_hash(module_hash, key, keep_lock=keep_lock)
if module is not None:
return module
# Compile the module since it's not cached
try:
# The op has c_code, so take the lock.
compilelock.get_lock()
lock_taken = True
# Maybe somebody else compiled it for us while we
# where waiting for the lock. Try to load it again
self.refresh()
module = self._get_from_key(key)
if module is not None:
return module
except Exception:
# This may happen e.g. when an Op has no C implementation.
# In any case, we do not want to keep around the temporary
# work directory, as it may cause trouble if we create too
# many of these. The 'ignore_if_missing' flag is set just
# in case this directory would have already been deleted.
_rmtree(location, ignore_if_missing=True,
msg=('exception -- '
'typically means no C implementation'))
raise
module = self._get_from_hash(module_hash, key, keep_lock=keep_lock)
if module is not None:
return module
finally:
# Release lock if needed.
if not keep_lock and lock_taken:
compilelock.release_lock()
hash_key = hash(key)
# Update map from key to module name for all keys associated to
# this same module.
all_keys = key_data.keys
if not all_keys:
# Should only happen for broken keys.
assert key_broken
all_keys = [key]
else:
assert key in key_data.keys
for k in all_keys:
if k in self.entry_from_key:
# If we had already seen this key, then it should be
# associated to the same module.
assert self.entry_from_key[k] == name
else:
self.entry_from_key[k] = name
if _version:
self.similar_keys.setdefault(get_safe_part(k),
[]).append(key)
if name in self.module_from_name:
# May happen if we are re-using an existing module.
assert duplicated_module
assert self.module_from_name[name] is module
else:
self.module_from_name[name] = module
module = self._compile_module(compile_steps)
self.stats[2] += 1
rval = module
#_logger.debug('stats %s %i', self.stats, sum(self.stats))
return rval
# Changing the hash of the key is not allowed during
# compilation.
assert hash(key) == hash_key
key_data = self._add_to_cache(module, key)
self.module_hash_to_key_data[module_hash] = key_data
finally:
# Release lock if needed.
if not keep_lock and lock_taken:
compilelock.release_lock()
self.stats[2] += 1
return module
def check_key(self, key, key_pkl):
"""
......
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