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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()

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