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Viewing changes to bzrlib/benchmarks/bench_pack.py

  • Committer: Martin Pool
  • Date: 2010-08-18 04:26:39 UTC
  • mfrom: (129.1.8 packaging-karmic)
  • Revision ID: mbp@sourcefrog.net-20100818042639-mjoxtngyjwiu05fo
* PPA rebuild for lucid.
* PPA rebuild for karmic.
* PPA rebuild onto jaunty.
* New upstream release.

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bzrlib/benchmarks/bench_pack.py
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# Copyright (C) 2007 Canonical Ltd
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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"""Benchmarks for pack performance"""
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import os
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from bzrlib import (
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    pack,
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    )
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from bzrlib.benchmarks import Benchmark
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class BenchPack(Benchmark):
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    """Benchmark pack performance."""
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    def test_insert_one_gig_1k_chunks_no_names_disk(self):
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        # test real disk writing of many small chunks.
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        # useful for testing whether buffer sizes are right
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        transport = self.get_transport()
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        stream = transport.open_write_stream('pack.pack')
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        writer = pack.ContainerWriter(stream.write)
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        self.write_1_gig(writer)
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        stream.close()
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    def test_insert_one_gig_1k_chunks_no_names_null(self):
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        # write to dev/null so we test the pack processing.
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        transport = self.get_transport()
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        dev_null = open('/dev/null', 'wb')
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        writer = pack.ContainerWriter(dev_null.write)
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        self.write_1_gig(writer)
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        dev_null.close()
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    def write_1_gig(self, writer):
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        one_k = "A" * 1024
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        writer.begin()
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        def write_1g():
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            for hunk in xrange(1024 * 1024):
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                writer.add_bytes_record(one_k, [])
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        self.time(write_1g)
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        writer.end()