← Back to branch summary

~bzr-pqm/bzr/bzr.dev

« back to all changes in this revision

Viewing changes to bzrlib/benchmarks/bench_pack.py

  • Committer: Martin Pool
  • Date: 2010-01-29 14:09:05 UTC
  • mto: This revision was merged to the branch mainline in revision 4992.
  • Revision ID: mbp@sourcefrog.net-20100129140905-2uiarb6p8di1ywsr
Correction to url

from review: https://code.edge.launchpad.net/~mbp/bzr/doc/+merge/18250

Show diffs side-by-side

added added

removed removed

Lines of Context:
bzrlib/benchmarks/bench_pack.py
 
1
# Copyright (C) 2007 Canonical Ltd
 
2
#
 
3
# This program is free software; you can redistribute it and/or modify
 
4
# it under the terms of the GNU General Public License as published by
 
5
# the Free Software Foundation; either version 2 of the License, or
 
6
# (at your option) any later version.
 
7
#
 
8
# This program is distributed in the hope that it will be useful,
 
9
# but WITHOUT ANY WARRANTY; without even the implied warranty of
 
10
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 
11
# GNU General Public License for more details.
 
12
#
 
13
# You should have received a copy of the GNU General Public License
 
14
# along with this program; if not, write to the Free Software
 
15
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 
16
 
 
17
"""Benchmarks for pack performance"""
 
18
 
 
19
import os
 
20
 
 
21
from bzrlib import (
 
22
    pack,
 
23
    )
 
24
from bzrlib.benchmarks import Benchmark
 
25
 
 
26
 
 
27
class BenchPack(Benchmark):
 
28
    """Benchmark pack performance."""
 
29
 
 
30
    def test_insert_one_gig_1k_chunks_no_names_disk(self):
 
31
        # test real disk writing of many small chunks.
 
32
        # useful for testing whether buffer sizes are right
 
33
        transport = self.get_transport()
 
34
        stream = transport.open_write_stream('pack.pack')
 
35
        writer = pack.ContainerWriter(stream.write)
 
36
        self.write_1_gig(writer)
 
37
        stream.close()
 
38
 
 
39
    def test_insert_one_gig_1k_chunks_no_names_null(self):
 
40
        # write to dev/null so we test the pack processing.
 
41
        transport = self.get_transport()
 
42
        dev_null = open('/dev/null', 'wb')
 
43
        writer = pack.ContainerWriter(dev_null.write)
 
44
        self.write_1_gig(writer)
 
45
        dev_null.close()
 
46
 
 
47
    def write_1_gig(self, writer):
 
48
        one_k = "A" * 1024
 
49
        writer.begin()
 
50
        def write_1g():
 
51
            for hunk in xrange(1024 * 1024):
 
52
                writer.add_bytes_record(one_k, [])
 
53
        self.time(write_1g)
 
54
        writer.end()