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Improve common_ancestor performance.

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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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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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    pass
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class LineConsumer(object):
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    def __init__(self, required_lines):
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        self.required_lines = required_lines
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    def write(self, text):
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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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    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)