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Viewing changes to bzrlib/benchmarks/bench_log.py

  • Committer: Ian Clatworthy
  • Date: 2009-09-09 15:30:59 UTC
  • mto: (4634.37.2 prepare-2.0)
  • mto: This revision was merged to the branch mainline in revision 4689.
  • Revision ID: ian.clatworthy@canonical.com-20090909153059-sb038agvd38ci2q8
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bzrlib/benchmarks/bench_log.py
 
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# Copyright (C) 2006 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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"""Tests for tree transform performance"""
 
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import os
 
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import sys
 
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from bzrlib.benchmarks import Benchmark
 
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from bzrlib.log import log_formatter, show_log
 
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from bzrlib.osutils import pathjoin
 
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from cStringIO import StringIO
 
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from bzrlib.transform import TreeTransform
 
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from bzrlib.workingtree import WorkingTree
 
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class LinesDone(Exception):
 
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    """Raised when `LineConsumer` reaches the required number of lines."""
 
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    pass
 
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class LineConsumer(object):
 
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    """Count lines that are produced.
 
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    When the required number of lines have been reached, raise `LinesDone`.
 
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    """
 
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    def __init__(self, required_lines):
 
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        """Create a new consumer.
 
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        :param required_lines: How many lines must be produced.
 
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        :type required_lines: integer
 
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        """
 
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        self.required_lines = required_lines
 
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    def write(self, text):
 
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        """Write some text to the black hole.
 
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        But count how many lines have been written.
 
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        :param text: A string that would be written.
 
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        :raise LinesDone: when the required number of lines has been reached.
 
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        :return: None
 
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        """
 
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        self.required_lines -= text.count('\n')
 
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        if self.required_lines < 0:
 
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            raise LinesDone()
 
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class LogBenchmark(Benchmark):
 
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    """Benchmarks for ``'bzr log'`` performance."""
 
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    def test_log(self):
 
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        """Run log in a many-commit tree."""
 
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        tree = self.make_many_commit_tree(hardlink=True)
 
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        lf = log_formatter('long', to_file=StringIO())
 
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        self.time(show_log, tree.branch, lf, direction='reverse')
 
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    def test_merge_log(self):
 
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        """Run log in a tree with many merges"""
 
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        tree = self.make_heavily_merged_tree(hardlink=True)
 
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        lf = log_formatter('short', to_file=StringIO())
 
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        self.time(show_log, tree.branch, lf, direction='reverse')
 
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    def test_log_screenful(self):
 
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        """Simulate log --long|less"""
 
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        self.screenful_tester('long')
 
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    def test_log_screenful_line(self):
 
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        """Simulate log --line|less"""
 
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        self.screenful_tester('line')
 
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    def test_log_screenful_short(self):
 
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        """Simulate log --short|less"""
 
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        self.screenful_tester('short')
 
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    def screenful_tester(self, formatter):
 
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        """Run show_log, but stop after 25 lines are generated"""
 
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        tree = self.make_many_commit_tree(hardlink=True)
 
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        def log_screenful():
 
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            lf = log_formatter(formatter, to_file=LineConsumer(25))
 
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            try:
 
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                show_log(tree.branch, lf, direction='reverse')
 
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            except LinesDone:
 
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                pass
 
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            else:
 
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                raise Exception, "LinesDone not raised"
 
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        self.time(log_screenful)
 
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    def test_cmd_log(self):
 
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        """Test execution of the log command."""
 
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        tree = self.make_many_commit_tree(hardlink=True)
 
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        self.time(self.run_bzr, ['log', '-r', '-4..'])
 
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    def test_cmd_log_subprocess(self):
 
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        """Text startup and execution of the log command."""
 
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        tree = self.make_many_commit_tree(hardlink=True)
 
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        self.time(self.run_bzr_subprocess, 'log', '-r', '-4..')
 
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    def test_log_verbose(self):
 
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        """'verbose' log -- shows file changes"""
 
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        tree = self.make_many_commit_tree(hardlink=True)
 
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        lf = log_formatter('long', to_file=StringIO())
 
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        self.time(show_log, tree.branch, lf, direction='reverse', verbose=True)