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8577d931d0
Many revset consumers construct changectx instances for each returned result. Add support for benchmarking this to our revset benchmark script. In the future, we might want to have some kind of special syntax in the parsed revset files to engage this mode automatically. This would enable us to load changectxs for revsets that do that in the code and would more accurately benchmark what's actually happening. For now, running all revsets with or without changectxs is sufficient.
326 lines
10 KiB
Python
Executable File
326 lines
10 KiB
Python
Executable File
#!/usr/bin/env python
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# Measure the performance of a list of revsets against multiple revisions
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# defined by parameter. Checkout one by one and run perfrevset with every
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# revset in the list to benchmark its performance.
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#
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# You should run this from the root of your mercurial repository.
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#
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# call with --help for details
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import sys
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import os
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import re
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import math
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from subprocess import check_call, Popen, CalledProcessError, STDOUT, PIPE
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# cannot use argparse, python 2.7 only
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from optparse import OptionParser
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DEFAULTVARIANTS = ['plain', 'min', 'max', 'first', 'last',
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'reverse', 'reverse+first', 'reverse+last',
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'sort', 'sort+first', 'sort+last']
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def check_output(*args, **kwargs):
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kwargs.setdefault('stderr', PIPE)
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kwargs.setdefault('stdout', PIPE)
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proc = Popen(*args, **kwargs)
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output, error = proc.communicate()
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if proc.returncode != 0:
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raise CalledProcessError(proc.returncode, ' '.join(args[0]))
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return output
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def update(rev):
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"""update the repo to a revision"""
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try:
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check_call(['hg', 'update', '--quiet', '--check', str(rev)])
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check_output(['make', 'local'],
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stderr=None) # suppress output except for error/warning
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except CalledProcessError as exc:
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print >> sys.stderr, 'update to revision %s failed, aborting' % rev
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sys.exit(exc.returncode)
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def hg(cmd, repo=None):
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"""run a mercurial command
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<cmd> is the list of command + argument,
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<repo> is an optional repository path to run this command in."""
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fullcmd = ['./hg']
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if repo is not None:
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fullcmd += ['-R', repo]
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fullcmd += ['--config',
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'extensions.perf=' + os.path.join(contribdir, 'perf.py')]
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fullcmd += cmd
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return check_output(fullcmd, stderr=STDOUT)
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def perf(revset, target=None, contexts=False):
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"""run benchmark for this very revset"""
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try:
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args = ['perfrevset', revset]
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if contexts:
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args.append('--contexts')
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output = hg(args, repo=target)
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return parseoutput(output)
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except CalledProcessError as exc:
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print >> sys.stderr, 'abort: cannot run revset benchmark: %s' % exc.cmd
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if exc.output is None:
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print >> sys.stderr, '(no output)'
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else:
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print >> sys.stderr, exc.output
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return None
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outputre = re.compile(r'! wall (\d+.\d+) comb (\d+.\d+) user (\d+.\d+) '
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'sys (\d+.\d+) \(best of (\d+)\)')
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def parseoutput(output):
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"""parse a textual output into a dict
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We cannot just use json because we want to compare with old
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versions of Mercurial that may not support json output.
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"""
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match = outputre.search(output)
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if not match:
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print >> sys.stderr, 'abort: invalid output:'
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print >> sys.stderr, output
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sys.exit(1)
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return {'comb': float(match.group(2)),
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'count': int(match.group(5)),
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'sys': float(match.group(3)),
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'user': float(match.group(4)),
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'wall': float(match.group(1)),
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}
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def printrevision(rev):
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"""print data about a revision"""
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sys.stdout.write("Revision ")
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sys.stdout.flush()
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check_call(['hg', 'log', '--rev', str(rev), '--template',
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'{if(tags, " ({tags})")} '
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'{rev}:{node|short}: {desc|firstline}\n'])
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def idxwidth(nbidx):
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"""return the max width of number used for index
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This is similar to log10(nbidx), but we use custom code here
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because we start with zero and we'd rather not deal with all the
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extra rounding business that log10 would imply.
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"""
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nbidx -= 1 # starts at 0
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idxwidth = 0
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while nbidx:
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idxwidth += 1
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nbidx //= 10
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if not idxwidth:
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idxwidth = 1
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return idxwidth
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def getfactor(main, other, field, sensitivity=0.05):
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"""return the relative factor between values for 'field' in main and other
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Return None if the factor is insignificant (less than <sensitivity>
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variation)."""
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factor = 1
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if main is not None:
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factor = other[field] / main[field]
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low, high = 1 - sensitivity, 1 + sensitivity
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if (low < factor < high):
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return None
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return factor
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def formatfactor(factor):
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"""format a factor into a 4 char string
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22%
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156%
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x2.4
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x23
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x789
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x1e4
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x5x7
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"""
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if factor is None:
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return ' '
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elif factor < 2:
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return '%3i%%' % (factor * 100)
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elif factor < 10:
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return 'x%3.1f' % factor
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elif factor < 1000:
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return '%4s' % ('x%i' % factor)
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else:
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order = int(math.log(factor)) + 1
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while 1 < math.log(factor):
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factor //= 0
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return 'x%ix%i' % (factor, order)
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def formattiming(value):
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"""format a value to strictly 8 char, dropping some precision if needed"""
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if value < 10**7:
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return ('%.6f' % value)[:8]
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else:
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# value is HUGE very unlikely to happen (4+ month run)
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return '%i' % value
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_marker = object()
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def printresult(variants, idx, data, maxidx, verbose=False, reference=_marker):
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"""print a line of result to stdout"""
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mask = '%%0%ii) %%s' % idxwidth(maxidx)
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out = []
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for var in variants:
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if data[var] is None:
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out.append('error ')
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out.append(' ' * 4)
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continue
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out.append(formattiming(data[var]['wall']))
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if reference is not _marker:
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factor = None
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if reference is not None:
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factor = getfactor(reference[var], data[var], 'wall')
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out.append(formatfactor(factor))
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if verbose:
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out.append(formattiming(data[var]['comb']))
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out.append(formattiming(data[var]['user']))
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out.append(formattiming(data[var]['sys']))
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out.append('%6d' % data[var]['count'])
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print mask % (idx, ' '.join(out))
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def printheader(variants, maxidx, verbose=False, relative=False):
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header = [' ' * (idxwidth(maxidx) + 1)]
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for var in variants:
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if not var:
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var = 'iter'
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if 8 < len(var):
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var = var[:3] + '..' + var[-3:]
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header.append('%-8s' % var)
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if relative:
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header.append(' ')
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if verbose:
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header.append('%-8s' % 'comb')
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header.append('%-8s' % 'user')
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header.append('%-8s' % 'sys')
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header.append('%6s' % 'count')
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print ' '.join(header)
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def getrevs(spec):
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"""get the list of rev matched by a revset"""
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try:
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out = check_output(['hg', 'log', '--template={rev}\n', '--rev', spec])
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except CalledProcessError as exc:
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print >> sys.stderr, "abort, can't get revision from %s" % spec
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sys.exit(exc.returncode)
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return [r for r in out.split() if r]
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def applyvariants(revset, variant):
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if variant == 'plain':
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return revset
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for var in variant.split('+'):
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revset = '%s(%s)' % (var, revset)
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return revset
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helptext="""This script will run multiple variants of provided revsets using
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different revisions in your mercurial repository. After the benchmark are run
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summary output is provided. Use it to demonstrate speed improvements or pin
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point regressions. Revsets to run are specified in a file (or from stdin), one
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revsets per line. Line starting with '#' will be ignored, allowing insertion of
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comments."""
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parser = OptionParser(usage="usage: %prog [options] <revs>",
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description=helptext)
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parser.add_option("-f", "--file",
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help="read revset from FILE (stdin if omitted)",
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metavar="FILE")
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parser.add_option("-R", "--repo",
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help="run benchmark on REPO", metavar="REPO")
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parser.add_option("-v", "--verbose",
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action='store_true',
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help="display all timing data (not just best total time)")
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parser.add_option("", "--variants",
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default=','.join(DEFAULTVARIANTS),
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help="comma separated list of variant to test "
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"(eg: plain,min,sorted) (plain = no modification)")
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parser.add_option('', '--contexts',
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action='store_true',
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help='obtain changectx from results instead of integer revs')
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(options, args) = parser.parse_args()
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if not args:
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parser.print_help()
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sys.exit(255)
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# the directory where both this script and the perf.py extension live.
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contribdir = os.path.dirname(__file__)
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revsetsfile = sys.stdin
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if options.file:
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revsetsfile = open(options.file)
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revsets = [l.strip() for l in revsetsfile if not l.startswith('#')]
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revsets = [l for l in revsets if l]
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print "Revsets to benchmark"
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print "----------------------------"
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for idx, rset in enumerate(revsets):
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print "%i) %s" % (idx, rset)
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print "----------------------------"
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print
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revs = []
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for a in args:
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revs.extend(getrevs(a))
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variants = options.variants.split(',')
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results = []
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for r in revs:
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print "----------------------------"
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printrevision(r)
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print "----------------------------"
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update(r)
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res = []
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results.append(res)
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printheader(variants, len(revsets), verbose=options.verbose)
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for idx, rset in enumerate(revsets):
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varres = {}
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for var in variants:
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varrset = applyvariants(rset, var)
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data = perf(varrset, target=options.repo, contexts=options.contexts)
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varres[var] = data
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res.append(varres)
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printresult(variants, idx, varres, len(revsets),
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verbose=options.verbose)
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sys.stdout.flush()
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print "----------------------------"
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print """
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Result by revset
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================
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"""
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print 'Revision:'
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for idx, rev in enumerate(revs):
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sys.stdout.write('%i) ' % idx)
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sys.stdout.flush()
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printrevision(rev)
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print
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print
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for ridx, rset in enumerate(revsets):
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print "revset #%i: %s" % (ridx, rset)
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printheader(variants, len(results), verbose=options.verbose, relative=True)
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ref = None
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for idx, data in enumerate(results):
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printresult(variants, idx, data[ridx], len(results),
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verbose=options.verbose, reference=ref)
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ref = data[ridx]
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print
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