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| author |  Thomas Rast <trast@student.ethz.ch> | 2011-12-12 22:16:08 +0100 |
|---|---|---|
| committer |  Junio C Hamano <gitster@pobox.com> | 2011-12-16 15:47:25 -0800 |
| commit | 53b8d931b649a0d82e16358a6bf1dd980dc24a6b (patch) | |
| tree | 72599a8be5639a34231de0de586a670be62ffc3e /builtin | |
| parent | grep: enable threading with -p and -W using lazy attribute lookup (diff) | |
| download | tgif-53b8d931b649a0d82e16358a6bf1dd980dc24a6b.tar.xz | |
grep: disable threading in non-worktree case
Measurements by various people have shown that grepping in parallel is
not beneficial when the object store is involved. For example, with a
simple regex:
Threads | --cached case | worktree case
----------------------------------------------------------------
8 (default) | 2.88u 0.21s 0:02.94real | 0.19u 0.32s 0:00.16real
4 | 2.89u 0.29s 0:02.99real | 0.16u 0.34s 0:00.17real
2 | 2.83u 0.36s 0:02.87real | 0.18u 0.32s 0:00.26real
NO_PTHREADS | 2.16u 0.08s 0:02.25real | 0.12u 0.17s 0:00.31real
This happens because all the threads contend on read_sha1_mutex almost
all of the time. A more complex regex allows the threads to do more
work in parallel, but as Jeff King found out, the "super boost" (much
higher clock when only one core is active) feature of recent CPUs
still causes the unthreaded case to win by a large margin.
So until the pack machinery allows unthreaded access, we disable
grep's threading in all but the worktree case.
Helped-by: René Scharfe <rene.scharfe@lsrfire.ath.cx>
Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Thomas Rast <trast@student.ethz.ch>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'builtin')
| -rw-r--r-- | builtin/grep.c | 36 |
1 files changed, 18 insertions, 18 deletions
diff --git a/builtin/grep.c b/builtin/grep.c index 6474eed19e..9ce064ac11 100644 --- a/builtin/grep.c +++ b/builtin/grep.c @@ -1002,24 +1002,6 @@ int cmd_grep(int argc, const char **argv, const char *prefix) if (!opt.fixed && opt.ignore_case) opt.regflags |= REG_ICASE; -#ifndef NO_PTHREADS - if (online_cpus() == 1) - use_threads = 0; -#else - use_threads = 0; -#endif - - opt.use_threads = use_threads; - -#ifndef NO_PTHREADS - if (use_threads) { - if (opt.pre_context || opt.post_context || opt.file_break || - opt.funcbody) - skip_first_line = 1; - start_threads(&opt); - } -#endif - compile_grep_patterns(&opt); /* Check revs and then paths */ @@ -1041,6 +1023,24 @@ int cmd_grep(int argc, const char **argv, const char *prefix) break; } +#ifndef NO_PTHREADS + if (list.nr || cached || online_cpus() == 1) + use_threads = 0; +#else + use_threads = 0; +#endif + + opt.use_threads = use_threads; + +#ifndef NO_PTHREADS + if (use_threads) { + if (opt.pre_context || opt.post_context || opt.file_break || + opt.funcbody) + skip_first_line = 1; + start_threads(&opt); + } +#endif + /* The rest are paths */ if (!seen_dashdash) { int j; |