Mercurial > hg
view tests/svn-safe-append.py @ 31397:8f5ed8fa39f8
perf: perform a garbage collection before each iteration
Currently, no explicit garbage collection is performed when running
the microbenchmarks in `hg perf`. I think this is wrong because
garbage collection can have a significant impact on execution times.
And, if gc is triggered via the default heuristics, it will
fire effectively randomly during subsequent benchmark iterations
due to variable amount of garbage left over from previous runs.
Running a gc before invoking the measured function will help ensure
state is more consistent across all iterations.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 13 Mar 2017 18:16:42 -0700 |
parents | bdba6a2015d0 |
children | ffa3026d4196 |
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#!/usr/bin/env python from __future__ import absolute_import __doc__ = """Same as `echo a >> b`, but ensures a changed mtime of b. Without this svn will not detect workspace changes.""" import os import sys text = sys.argv[1] fname = sys.argv[2] f = open(fname, "ab") try: before = os.fstat(f.fileno()).st_mtime f.write(text) f.write("\n") finally: f.close() inc = 1 now = os.stat(fname).st_mtime while now == before: t = now + inc inc += 1 os.utime(fname, (t, t)) now = os.stat(fname).st_mtime