~bzr-pqm/bzr/bzr.dev

# Copyright (C) 2007 Canonical Ltd

#

# This program is free software; you can redistribute it and/or modify

# it under the terms of the GNU General Public License as published by

# the Free Software Foundation; either version 2 of the License, or

# (at your option) any later version.

#

# This program is distributed in the hope that it will be useful,

# but WITHOUT ANY WARRANTY; without even the implied warranty of

# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

# GNU General Public License for more details.

#

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA

"""Benchmarks for pack performance"""

import os

from bzrlib import (

    pack,

    )

from bzrlib.benchmarks import Benchmark

class BenchPack(Benchmark):

    """Benchmark pack performance."""

    def test_insert_one_gig_1k_chunks_no_names_disk(self):

        # test real disk writing of many small chunks.

        # useful for testing whether buffer sizes are right

        transport = self.get_transport()

        stream = transport.open_write_stream('pack.pack')

        writer = pack.ContainerWriter(stream.write)

        self.write_1_gig(writer)

        stream.close()

    def test_insert_one_gig_1k_chunks_no_names_null(self):

        # write to dev/null so we test the pack processing.

        transport = self.get_transport()

        dev_null = open('/dev/null', 'wb')

        writer = pack.ContainerWriter(dev_null.write)

        self.write_1_gig(writer)

        dev_null.close()

    def write_1_gig(self, writer):

        one_k = "A" * 1024

        writer.begin()

        def write_1g():

            for hunk in xrange(1024 * 1024):

                writer.add_bytes_record(one_k, [])

        self.time(write_1g)

        writer.end()