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# Copyright (C) 2010, 2011 Sebastian Thiel (byronimo@gmail.com) and contributors
#
# This module is part of GitDB and is released under
# the New BSD License: http://www.opensource.org/licenses/bsd-license.php
"""Specific test for pack streams only"""
from lib import (
TestBigRepoR
)
from gitdb.db.pack import PackedDB
from gitdb.stream import NullStream
from gitdb.pack import PackEntity
import os
import sys
from time import time
from nose import SkipTest
class CountedNullStream(NullStream):
__slots__ = '_bw'
def __init__(self):
self._bw = 0
def bytes_written(self):
return self._bw
def write(self, d):
self._bw += NullStream.write(self, d)
class TestPackStreamingPerformance(TestBigRepoR):
def test_pack_writing(self):
# see how fast we can write a pack from object streams.
# This will not be fast, as we take time for decompressing the streams as well
ostream = CountedNullStream()
pdb = PackedDB(os.path.join(self.gitrepopath, "objects/pack"))
ni = 5000
count = 0
total_size = 0
st = time()
objs = list()
for sha in pdb.sha_iter():
count += 1
objs.append(pdb.stream(sha))
if count == ni:
break
#END gather objects for pack-writing
elapsed = time() - st
print >> sys.stderr, "PDB Streaming: Got %i streams by sha in in %f s ( %f streams/s )" % (ni, elapsed, ni / elapsed)
st = time()
PackEntity.write_pack(objs, ostream.write)
elapsed = time() - st
total_kb = ostream.bytes_written() / 1000
print >> sys.stderr, "PDB Streaming: Wrote pack of size %i kb in %f s (%f kb/s)" % (total_kb, elapsed, total_kb/elapsed)
def test_stream_reading(self):
raise SkipTest()
pdb = PackedDB(os.path.join(self.gitrepopath, "objects/pack"))
# streaming only, meant for --with-profile runs
ni = 5000
count = 0
pdb_stream = pdb.stream
total_size = 0
st = time()
for sha in pdb.sha_iter():
if count == ni:
break
stream = pdb_stream(sha)
stream.read()
total_size += stream.size
count += 1
elapsed = time() - st
total_kib = total_size / 1000
print >> sys.stderr, "PDB Streaming: Got %i streams by sha and read all bytes totallying %i KiB ( %f KiB / s ) in %f s ( %f streams/s )" % (ni, total_kib, total_kib/elapsed , elapsed, ni / elapsed)
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