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# This module is part of GitPython and is released under the

# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/

"""Performance tests for object store."""

import sys

from time import time

from test.performance.lib import TestBigRepoR

class TestObjDBPerformance(TestBigRepoR):

def test_random_access(self):

results = [["Iterate Commits"], ["Iterate Blobs"], ["Retrieve Blob Data"]]

for repo in (self.gitrorepo, self.puregitrorepo):

# GET COMMITS

st = time()

root_commit = repo.commit(repo.head)

commits = list(root_commit.traverse())

nc = len(commits)

elapsed = time() - st

print(

"%s: Retrieved %i commits from ObjectStore in %g s ( %f commits / s )"

% (type(repo.odb), nc, elapsed, nc / elapsed),

file=sys.stderr,

)

results[0].append(elapsed)

# GET TREES

# Walk all trees of all commits.

st = time()

blobs_per_commit = []

nt = 0

for commit in commits:

tree = commit.tree

blobs = []

for item in tree.traverse():

nt += 1

if item.type == "blob":

blobs.append(item)

# Direct access for speed.

# END while trees are there for walking

blobs_per_commit.append(blobs)

# END for each commit

elapsed = time() - st

print(

"%s: Retrieved %i objects from %i commits in %g s ( %f objects / s )"

% (type(repo.odb), nt, len(commits), elapsed, nt / elapsed),

file=sys.stderr,

)

results[1].append(elapsed)

# GET BLOBS

st = time()

nb = 0

too_many = 15000

data_bytes = 0

for blob_list in blobs_per_commit:

for blob in blob_list:

data_bytes += len(blob.data_stream.read())

# END for each blobsha

nb += len(blob_list)

if nb > too_many:

break

# END for each bloblist

elapsed = time() - st

msg = "%s: Retrieved %i blob (%i KiB) and their data in %g s ( %f blobs / s, %f KiB / s )" % (

type(repo.odb),

nb,

data_bytes / 1000,

elapsed,

nb / elapsed,

(data_bytes / 1000) / elapsed,

)

print(msg, file=sys.stderr)

results[2].append(elapsed)

# END for each repo type

# Final results.

for test_name, a, b in results:

print(

"%s: %f s vs %f s, pure is %f times slower" % (test_name, a, b, b / a),

file=sys.stderr,

)

# END for each result

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