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  • Committer: Canonical.com Patch Queue Manager
  • Date: 2007-09-04 00:46:17 UTC
  • mfrom: (2776.2.2 integration)
  • Revision ID: pqm@pqm.ubuntu.com-20070904004617-gu4xyzuw6mgesvt7
(robertc) Reduce overhead in pack generation by 25 percent. (Robert Collins)

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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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()