From: Junio C Hamano <gitster@pobox.com>
To: git@vger.kernel.org
Subject: Re: [PATCH 4/4] diffcore-pickaxe: optimize by trimming common initial and trailing parts
Date: Thu, 26 Feb 2009 01:05:18 -0800 [thread overview]
Message-ID: <7vy6vtva9d.fsf@gitster.siamese.dyndns.org> (raw)
In-Reply-To: <30c0d4d9b64924679c9af00796f7e0b562020ddf.1235629933.git.gitster@pobox.com> (Junio C. Hamano's message of "Wed, 25 Feb 2009 22:52:06 -0800")
Junio C Hamano <gitster@pobox.com> writes:
> With this optimization in place, the following query in the Linux kernel
> repository on my machine becomes about 40% faster:
>
> $ STRING='Ensure that the real time constraints are schedulable.'
> $ git log -S"$STRING" HEAD -- kernel/sched.c >/dev/null
>
> (Before the patch, best of 5 runs)
> 5.59user 0.15system 0:05.74elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (0major+39956minor)pagefaults 0swaps
>
> (After the patch, best of 5 runs)
> 3.04user 0.17system 0:03.23elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
> 0inputs+0outputs (0major+49697minor)pagefaults 0swaps
The file "kernel/sched.c" has roughly 900 changes applied to it, and over
its lifetime, it has grown from 5kB to 9kB in size.
I suspect a larger file might see a bigger performance boost.
next prev parent reply other threads:[~2009-02-26 9:06 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-26 6:52 [PATCH 0/4] Pickaxe search clean-up and optimization Junio C Hamano
2009-02-26 6:52 ` [PATCH 1/4] diffcore-pickaxe: refactor diffcore_pickaxe() Junio C Hamano
2009-02-27 23:58 ` René Scharfe
2009-02-26 6:52 ` [PATCH 2/4] diffcore-pickaxe: micro-optimize has_match() function Junio C Hamano
2009-02-26 6:52 ` [PATCH 3/4] diffcore-pickaxe: further refactor count_match() Junio C Hamano
2009-02-26 7:23 ` Kjetil Barvik
2009-02-28 1:13 ` René Scharfe
2009-02-28 1:25 ` Junio C Hamano
2009-02-28 6:08 ` Junio C Hamano
2009-02-28 13:10 ` René Scharfe
2009-02-28 17:40 ` Junio C Hamano
2009-02-28 18:15 ` René Scharfe
2009-02-28 19:16 ` [PATCH] import memmem() with linear complexity from Gnulib René Scharfe
2009-02-28 22:44 ` Mike Hommey
2009-03-01 3:41 ` Jeff King
2009-03-01 11:15 ` René Scharfe
2009-03-01 18:55 ` René Scharfe
2009-03-01 7:31 ` [PATCH 3/4] diffcore-pickaxe: further refactor count_match() Junio C Hamano
2009-03-01 10:53 ` René Scharfe
2009-02-26 6:52 ` [PATCH 4/4] diffcore-pickaxe: optimize by trimming common initial and trailing parts Junio C Hamano
2009-02-26 9:05 ` Junio C Hamano [this message]
2009-03-02 23:00 ` [PATCH 1/2] diffcore-pickaxe: use memmem() René Scharfe
2009-03-02 23:19 ` [PATCH 2/2] optimize compat/ memmem() René Scharfe
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