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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
"""Performance tests for object store"""
from __future__ import print_function
from gitdb.test.performance.lib import (
TestBigRepoR
)
from gitdb import (
MemoryDB,
GitDB,
IStream,
)
from gitdb.typ import str_blob_type
from gitdb.exc import UnsupportedOperation
from gitdb.db.pack import PackedDB
from gitdb.utils.compat import xrange
from gitdb.test.lib import skip_on_travis_ci
import sys
import os
from time import time
class TestPackedDBPerformance(TestBigRepoR):
@skip_on_travis_ci
def test_pack_random_access(self):
pdb = PackedDB(os.path.join(self.gitrepopath, "objects/pack"))
# sha lookup
st = time()
sha_list = list(pdb.sha_iter())
elapsed = time() - st
ns = len(sha_list)
print("PDB: looked up %i shas by index in %f s ( %f shas/s )" % (ns, elapsed, ns / (elapsed or 1)), file=sys.stderr)
# sha lookup: best-case and worst case access
pdb_pack_info = pdb._pack_info
# END shuffle shas
st = time()
for sha in sha_list:
pdb_pack_info(sha)
# END for each sha to look up
elapsed = time() - st
# discard cache
del(pdb._entities)
pdb.entities()
print("PDB: looked up %i sha in %i packs in %f s ( %f shas/s )" %
(ns, len(pdb.entities()), elapsed, ns / (elapsed or 1)), file=sys.stderr)
# END for each random mode
# query info and streams only
max_items = 10000 # can wait longer when testing memory
for pdb_fun in (pdb.info, pdb.stream):
st = time()
for sha in sha_list[:max_items]:
pdb_fun(sha)
elapsed = time() - st
print("PDB: Obtained %i object %s by sha in %f s ( %f items/s )" %
(max_items, pdb_fun.__name__.upper(), elapsed, max_items / (elapsed or 1)), file=sys.stderr)
# END for each function
# retrieve stream and read all
max_items = 5000
pdb_stream = pdb.stream
total_size = 0
st = time()
for sha in sha_list[:max_items]:
stream = pdb_stream(sha)
read_len = len(stream.read())
assert read_len == stream.size
total_size += stream.size
elapsed = time() - st
total_kib = total_size / 1000
print("PDB: Obtained %i streams by sha and read all bytes totallying %i KiB ( %f KiB / s ) in %f s ( %f streams/s )" %
(max_items, total_kib, total_kib / (elapsed or 1), elapsed, max_items / (elapsed or 1)), file=sys.stderr)
@skip_on_travis_ci
def test_loose_correctness(self):
"""based on the pack(s) of our packed object DB, we will just copy and verify all objects in the back
into the loose object db (memory).
This should help finding dormant issues like this one https://github.com/gitpython-developers/GitPython/issues/220
faster
:note: It doesn't seem this test can find the issue unless the given pack contains highly compressed
data files, like archives."""
from gitdb.util import bin_to_hex
pdb = GitDB(os.path.join(self.gitrepopath, 'objects'))
mdb = MemoryDB()
for c, sha in enumerate(pdb.sha_iter()):
ostream = pdb.stream(sha)
# the issue only showed on larger files which are hardly compressible ...
if ostream.type != str_blob_type:
continue
istream = IStream(ostream.type, ostream.size, ostream.stream)
mdb.store(istream)
assert istream.binsha == sha, "Failed on object %s" % bin_to_hex(sha).decode('ascii')
# this can fail ... sometimes, so the packs dataset should be huge
assert len(mdb.stream(sha).read()) == ostream.size
if c and c % 1000 == 0:
print("Verified %i loose object compression/decompression cycles" % c, file=sys.stderr)
mdb._cache.clear()
# end for each sha to copy
@skip_on_travis_ci
def test_correctness(self):
pdb = PackedDB(os.path.join(self.gitrepopath, "objects/pack"))
# disabled for now as it used to work perfectly, checking big repositories takes a long time
print("Endurance run: verify streaming of objects (crc and sha)", file=sys.stderr)
for crc in range(2):
count = 0
st = time()
for entity in pdb.entities():
pack_verify = entity.is_valid_stream
sha_by_index = entity.index().sha
for index in xrange(entity.index().size()):
try:
assert pack_verify(sha_by_index(index), use_crc=crc)
count += 1
except UnsupportedOperation:
pass
# END ignore old indices
# END for each index
# END for each entity
elapsed = time() - st
print("PDB: verified %i objects (crc=%i) in %f s ( %f objects/s )" %
(count, crc, elapsed, count / (elapsed or 1)), file=sys.stderr)
# END for each verify mode