def has_object_async(self, reader): """Return a reader yielding information about the membership of objects as identified by shas :param reader: Reader yielding 20 byte shas. :return: async.Reader yielding tuples of (sha, bool) pairs which indicate whether the given sha exists in the database or not""" task = ChannelThreadTask(reader, str(self.has_object_async), lambda sha: (sha, self.has_object(sha))) return pool.add_task(task)
def has_object_async(self, reader):
"""Return a reader yielding information about the membership of objects
as identified by shas
:param reader: Reader yielding 20 byte shas.
:return: async.Reader yielding tuples of (sha, bool) pairs which indicate
whether the given sha exists in the database or not"""
task = ChannelThreadTask(reader, str(self.has_object_async), lambda sha: (sha, self.has_object(sha)))
return pool.add_task(task)
def stream_async(self, reader):
"""Retrieve the OStream of multiple objects
:param reader: see ``info``
:param max_threads: see ``ObjectDBW.store``
:return: async.Reader yielding OStream|InvalidOStream instances in any order
:note: depending on the system configuration, it might not be possible to
read all OStreams at once. Instead, read them individually using reader.read(x)
where x is small enough."""
# base implementation just uses the stream method repeatedly
task = ChannelThreadTask(reader, str(self.stream_async), self.stream)
return pool.add_task(task)
def stream_async(self, reader): """Retrieve the OStream of multiple objects :param reader: see ``info`` :param max_threads: see ``ObjectDBW.store`` :return: async.Reader yielding OStream|InvalidOStream instances in any order :note: depending on the system configuration, it might not be possible to read all OStreams at once. Instead, read them individually using reader.read(x) where x is small enough.""" # base implementation just uses the stream method repeatedly task = ChannelThreadTask(reader, str(self.stream_async), self.stream) return pool.add_task(task)
def store_async(self, reader):
"""
Create multiple new objects in the database asynchronously. The method will
return right away, returning an output channel which receives the results as
they are computed.
:return: Channel yielding your IStream which served as input, in any order.
The IStreams sha will be set to the sha it received during the process,
or its error attribute will be set to the exception informing about the error.
:param reader: async.Reader yielding IStream instances.
The same instances will be used in the output channel as were received
in by the Reader.
:note:As some ODB implementations implement this operation atomic, they might
abort the whole operation if one item could not be processed. Hence check how
many items have actually been produced."""
# base implementation uses store to perform the work
task = ChannelThreadTask(reader, str(self.store_async), self.store)
return pool.add_task(task)
def store_async(self, reader): """ Create multiple new objects in the database asynchronously. The method will return right away, returning an output channel which receives the results as they are computed. :return: Channel yielding your IStream which served as input, in any order. The IStreams sha will be set to the sha it received during the process, or its error attribute will be set to the exception informing about the error. :param reader: async.Reader yielding IStream instances. The same instances will be used in the output channel as were received in by the Reader. :note:As some ODB implementations implement this operation atomic, they might abort the whole operation if one item could not be processed. Hence check how many items have actually been produced.""" # base implementation uses store to perform the work task = ChannelThreadTask(reader, str(self.store_async), self.store) return pool.add_task(task)
def info_async(self, reader):
"""Retrieve information of a multitude of objects asynchronously
:param reader: Channel yielding the sha's of the objects of interest
:return: async.Reader yielding OInfo|InvalidOInfo, in any order"""
task = ChannelThreadTask(reader, str(self.info_async), self.info)
return pool.add_task(task)
def test_large_data_streaming(self, path):
ldb = LooseObjectDB(path)
string_ios = list() # list of streams we previously created
# serial mode
for randomize in range(2):
desc = (randomize and 'random ') or ''
print >> sys.stderr, "Creating %s data ..." % desc
st = time()
size, stream = make_memory_file(self.large_data_size_bytes, randomize)
elapsed = time() - st
print >> sys.stderr, "Done (in %f s)" % elapsed
string_ios.append(stream)
# writing - due to the compression it will seem faster than it is
st = time()
sha = ldb.store(IStream('blob', size, stream)).binsha
elapsed_add = time() - st
assert ldb.has_object(sha)
db_file = ldb.readable_db_object_path(bin_to_hex(sha))
fsize_kib = os.path.getsize(db_file) / 1000
size_kib = size / 1000
print >> sys.stderr, "Added %i KiB (filesize = %i KiB) of %s data to loose odb in %f s ( %f Write KiB / s)" % (size_kib, fsize_kib, desc, elapsed_add, size_kib / elapsed_add)
# reading all at once
st = time()
ostream = ldb.stream(sha)
shadata = ostream.read()
elapsed_readall = time() - st
stream.seek(0)
assert shadata == stream.getvalue()
print >> sys.stderr, "Read %i KiB of %s data at once from loose odb in %f s ( %f Read KiB / s)" % (size_kib, desc, elapsed_readall, size_kib / elapsed_readall)
# reading in chunks of 1 MiB
cs = 512*1000
chunks = list()
st = time()
ostream = ldb.stream(sha)
while True:
data = ostream.read(cs)
chunks.append(data)
if len(data) < cs:
break
# END read in chunks
elapsed_readchunks = time() - st
stream.seek(0)
assert ''.join(chunks) == stream.getvalue()
cs_kib = cs / 1000
print >> sys.stderr, "Read %i KiB of %s data in %i KiB chunks from loose odb in %f s ( %f Read KiB / s)" % (size_kib, desc, cs_kib, elapsed_readchunks, size_kib / elapsed_readchunks)
# del db file so we keep something to do
os.remove(db_file)
# END for each randomization factor
# multi-threaded mode
# want two, should be supported by most of todays cpus
pool.set_size(2)
total_kib = 0
nsios = len(string_ios)
for stream in string_ios:
stream.seek(0)
total_kib += len(stream.getvalue()) / 1000
# END rewind
def istream_iter():
for stream in string_ios:
stream.seek(0)
yield IStream(str_blob_type, len(stream.getvalue()), stream)
# END for each stream
# END util
# write multiple objects at once, involving concurrent compression
reader = IteratorReader(istream_iter())
istream_reader = ldb.store_async(reader)
istream_reader.task().max_chunksize = 1
st = time()
istreams = istream_reader.read(nsios)
assert len(istreams) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Compressed %i KiB of data in loose odb in %f s ( %f Write KiB / s)" % (pool.size(), total_kib, elapsed, total_kib / elapsed)
# decompress multiple at once, by reading them
# chunk size is not important as the stream will not really be decompressed
# until its read
istream_reader = IteratorReader(iter([ i.binsha for i in istreams ]))
ostream_reader = ldb.stream_async(istream_reader)
chunk_task = TestStreamReader(ostream_reader, "chunker", None)
output_reader = pool.add_task(chunk_task)
output_reader.task().max_chunksize = 1
st = time()
assert len(output_reader.read(nsios)) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Decompressed %i KiB of data in loose odb in %f s ( %f Read KiB / s)" % (pool.size(), total_kib, elapsed, total_kib / elapsed)
# store the files, and read them back. For the reading, we use a task
# as well which is chunked into one item per task. Reading all will
# very quickly result in two threads handling two bytestreams of
# chained compression/decompression streams
reader = IteratorReader(istream_iter())
istream_reader = ldb.store_async(reader)
istream_reader.task().max_chunksize = 1
istream_to_sha = lambda items: [ i.binsha for i in items ]
istream_reader.set_post_cb(istream_to_sha)
ostream_reader = ldb.stream_async(istream_reader)
chunk_task = TestStreamReader(ostream_reader, "chunker", None)
output_reader = pool.add_task(chunk_task)
output_reader.max_chunksize = 1
st = time()
assert len(output_reader.read(nsios)) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Compressed and decompressed and read %i KiB of data in loose odb in %f s ( %f Combined KiB / s)" % (pool.size(), total_kib, elapsed, total_kib / elapsed)
def info_async(self, reader): """Retrieve information of a multitude of objects asynchronously :param reader: Channel yielding the sha's of the objects of interest :return: async.Reader yielding OInfo|InvalidOInfo, in any order""" task = ChannelThreadTask(reader, str(self.info_async), self.info) return pool.add_task(task)
def test_large_data_streaming(self, path):
ldb = LooseObjectDB(path)
string_ios = list() # list of streams we previously created
# serial mode
for randomize in range(2):
desc = (randomize and 'random ') or ''
print >> sys.stderr, "Creating %s data ..." % desc
st = time()
size, stream = make_memory_file(self.large_data_size_bytes,
randomize)
elapsed = time() - st
print >> sys.stderr, "Done (in %f s)" % elapsed
string_ios.append(stream)
# writing - due to the compression it will seem faster than it is
st = time()
sha = ldb.store(IStream('blob', size, stream)).binsha
elapsed_add = time() - st
assert ldb.has_object(sha)
db_file = ldb.readable_db_object_path(bin_to_hex(sha))
fsize_kib = os.path.getsize(db_file) / 1000
size_kib = size / 1000
print >> sys.stderr, "Added %i KiB (filesize = %i KiB) of %s data to loose odb in %f s ( %f Write KiB / s)" % (
size_kib, fsize_kib, desc, elapsed_add, size_kib / elapsed_add)
# reading all at once
st = time()
ostream = ldb.stream(sha)
shadata = ostream.read()
elapsed_readall = time() - st
stream.seek(0)
assert shadata == stream.getvalue()
print >> sys.stderr, "Read %i KiB of %s data at once from loose odb in %f s ( %f Read KiB / s)" % (
size_kib, desc, elapsed_readall, size_kib / elapsed_readall)
# reading in chunks of 1 MiB
cs = 512 * 1000
chunks = list()
st = time()
ostream = ldb.stream(sha)
while True:
data = ostream.read(cs)
chunks.append(data)
if len(data) < cs:
break
# END read in chunks
elapsed_readchunks = time() - st
stream.seek(0)
assert ''.join(chunks) == stream.getvalue()
cs_kib = cs / 1000
print >> sys.stderr, "Read %i KiB of %s data in %i KiB chunks from loose odb in %f s ( %f Read KiB / s)" % (
size_kib, desc, cs_kib, elapsed_readchunks,
size_kib / elapsed_readchunks)
# del db file so we keep something to do
os.remove(db_file)
# END for each randomization factor
# multi-threaded mode
# want two, should be supported by most of todays cpus
pool.set_size(2)
total_kib = 0
nsios = len(string_ios)
for stream in string_ios:
stream.seek(0)
total_kib += len(stream.getvalue()) / 1000
# END rewind
def istream_iter():
for stream in string_ios:
stream.seek(0)
yield IStream(str_blob_type, len(stream.getvalue()), stream)
# END for each stream
# END util
# write multiple objects at once, involving concurrent compression
reader = IteratorReader(istream_iter())
istream_reader = ldb.store_async(reader)
istream_reader.task().max_chunksize = 1
st = time()
istreams = istream_reader.read(nsios)
assert len(istreams) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Compressed %i KiB of data in loose odb in %f s ( %f Write KiB / s)" % (
pool.size(), total_kib, elapsed, total_kib / elapsed)
# decompress multiple at once, by reading them
# chunk size is not important as the stream will not really be decompressed
# until its read
istream_reader = IteratorReader(iter([i.binsha for i in istreams]))
ostream_reader = ldb.stream_async(istream_reader)
chunk_task = TestStreamReader(ostream_reader, "chunker", None)
output_reader = pool.add_task(chunk_task)
output_reader.task().max_chunksize = 1
st = time()
assert len(output_reader.read(nsios)) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Decompressed %i KiB of data in loose odb in %f s ( %f Read KiB / s)" % (
pool.size(), total_kib, elapsed, total_kib / elapsed)
# store the files, and read them back. For the reading, we use a task
# as well which is chunked into one item per task. Reading all will
# very quickly result in two threads handling two bytestreams of
# chained compression/decompression streams
reader = IteratorReader(istream_iter())
istream_reader = ldb.store_async(reader)
istream_reader.task().max_chunksize = 1
istream_to_sha = lambda items: [i.binsha for i in items]
istream_reader.set_post_cb(istream_to_sha)
ostream_reader = ldb.stream_async(istream_reader)
chunk_task = TestStreamReader(ostream_reader, "chunker", None)
output_reader = pool.add_task(chunk_task)
output_reader.max_chunksize = 1
st = time()
assert len(output_reader.read(nsios)) == nsios
elapsed = time() - st
print >> sys.stderr, "Threads(%i): Compressed and decompressed and read %i KiB of data in loose odb in %f s ( %f Combined KiB / s)" % (
pool.size(), total_kib, elapsed, total_kib / elapsed)
