From: Jeff King <peff@peff.net>
To: "René Scharfe" <rene.scharfe@lsrfire.ath.cx>
Cc: git@vger.kernel.org, Eric Herman <eric@freesa.org>,
Junio C Hamano <gitster@pobox.com>
Subject: Re: [PATCH v2 3/3] grep: disable threading in all but worktree case
Date: Tue, 6 Dec 2011 23:24:31 -0500 [thread overview]
Message-ID: <20111207042431.GA10765@sigill.intra.peff.net> (raw)
In-Reply-To: <4EDE9BBA.2010409@lsrfire.ath.cx>
On Tue, Dec 06, 2011 at 11:48:26PM +0100, René Scharfe wrote:
> #ifndef NO_PTHREADS
> - if (use_threads) {
> + if (nr_threads > 0) {
> grep_sha1_async(opt, name, sha1);
> return 0;
> } else
Should this be "if (nr_threads > 1)"?
As a user, I would do:
git grep --threads=1 ...
if I wanted a single-threaded process. Instead, we actually spawn a
sub-thread and do all of the locking, which has a measurable cost:
$ time git grep --threads=0 SIMPLE HEAD >/dev/null
real 0m2.994s
user 0m2.932s
sys 0m0.060s
$ time git grep --threads=1 SIMPLE HEAD >/dev/null
real 0m3.407s
user 0m3.392s
sys 0m0.140s
Should --threads=1 be equivalent to --threads=0?
-Peff
next prev parent reply other threads:[~2011-12-07 4:24 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-25 14:46 [PATCH] grep: load funcname patterns for -W Thomas Rast
2011-11-25 16:32 ` René Scharfe
2011-11-26 12:15 ` [PATCH] grep: enable multi-threading for -p and -W René Scharfe
2011-11-29 9:54 ` Thomas Rast
2011-11-29 13:49 ` René Scharfe
2011-11-29 14:07 ` Thomas Rast
2011-12-02 13:07 ` [PATCH v2 0/3] grep multithreading and scaling Thomas Rast
2011-12-02 13:07 ` [PATCH v2 1/3] grep: load funcname patterns for -W Thomas Rast
2011-12-02 13:07 ` [PATCH v2 2/3] grep: enable threading with -p and -W using lazy attribute lookup Thomas Rast
2011-12-02 13:07 ` [PATCH v2 3/3] grep: disable threading in all but worktree case Thomas Rast
2011-12-02 16:15 ` René Scharfe
2011-12-05 9:02 ` Thomas Rast
2011-12-06 22:48 ` René Scharfe
2011-12-06 23:01 ` [PATCH 4/2] grep: turn off threading for non-worktree René Scharfe
2011-12-07 4:42 ` Jeff King
2011-12-07 17:11 ` René Scharfe
2011-12-07 18:28 ` Jeff King
2011-12-07 20:11 ` J. Bruce Fields
2011-12-07 20:45 ` Jeff King
2011-12-07 8:12 ` Thomas Rast
2011-12-07 17:00 ` René Scharfe
2011-12-10 13:13 ` Pete Wyckoff
2011-12-12 22:37 ` René Scharfe
2011-12-07 4:24 ` Jeff King [this message]
2011-12-07 16:52 ` [PATCH v2 3/3] grep: disable threading in all but worktree case René Scharfe
2011-12-07 18:10 ` Jeff King
2011-12-07 8:11 ` Thomas Rast
2011-12-07 16:54 ` René Scharfe
2011-12-12 21:16 ` [PATCH v3 0/3] grep attributes and multithreading Thomas Rast
2011-12-12 21:16 ` [PATCH v3 1/3] grep: load funcname patterns for -W Thomas Rast
2011-12-12 21:16 ` [PATCH v3 2/3] grep: enable threading with -p and -W using lazy attribute lookup Thomas Rast
2011-12-16 8:22 ` Johannes Sixt
2011-12-16 17:34 ` Junio C Hamano
2011-12-12 21:16 ` [PATCH v3 3/3] grep: disable threading in non-worktree case Thomas Rast
2011-12-12 22:37 ` [PATCH v3 0/3] grep attributes and multithreading René Scharfe
2011-12-12 23:44 ` Junio C Hamano
2011-12-13 8:44 ` Thomas Rast
2011-12-23 22:37 ` [PATCH v2 3/3] grep: disable threading in all but worktree case Ævar Arnfjörð Bjarmason
2011-12-23 22:49 ` Thomas Rast
2011-12-24 1:39 ` Ævar Arnfjörð Bjarmason
2011-12-24 7:07 ` Jeff King
2011-12-24 10:49 ` Nguyen Thai Ngoc Duy
2011-12-24 10:55 ` Nguyen Thai Ngoc Duy
2011-12-24 13:38 ` Jeff King
2011-12-25 3:32 ` Nguyen Thai Ngoc Duy
2011-12-02 17:34 ` [PATCH v2 0/3] grep multithreading and scaling Jeff King
2011-12-05 9:38 ` Thomas Rast
2011-12-05 20:16 ` Thomas Rast
2011-12-06 0:40 ` Jeff King
2011-12-02 20:02 ` Eric Herman
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