Mercurial > hg
view tests/svn-safe-append.py @ 30977:5a9e4dc8e4fd
contrib: add a write microbenchmark to perf.py
I'm adding some performance logging to ui.write - this benchmark lets us
confirm that the cost of that logging is acceptably low.
At this point, the microbenchmark on Linux over SSH shows:
! wall 3.213560 comb 0.410000 user 0.350000 sys 0.060000 (best of 4)
while on the Mac locally, it shows:
! wall 0.342325 comb 0.180000 user 0.110000 sys 0.070000 (best of 20)
author | Simon Farnsworth <simonfar@fb.com> |
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date | Wed, 15 Feb 2017 13:07:26 -0800 |
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