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author | René Scharfe <rene.scharfe@lsrfire.ath.cx> | 2009-03-03 00:00:55 +0100 |
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committer | Junio C Hamano <gitster@pobox.com> | 2009-03-02 18:28:03 -0800 |
commit | ce163c793d2058056ccc57563c350fd6415397ca (patch) | |
tree | a9c66946a7778d19495802a7235e280dc8238d5c /imap-send.c | |
parent | f474c526618d5d1111b585a6344e012fb731d3fe (diff) | |
download | git-ce163c793d2058056ccc57563c350fd6415397ca.tar.gz git-ce163c793d2058056ccc57563c350fd6415397ca.tar.xz |
diffcore-pickaxe: use memmem()
Use memmem() instead of open-coding it. The system libraries usually have a
much faster version than the memcmp()-loop here. Even our own fall-back in
compat/, which is used on Windows, is slightly faster.
The following commands were run in a Linux kernel repository and timed, the
best of five results is shown:
$ STRING='Ensure that the real time constraints are schedulable.'
$ git log -S"$STRING" HEAD -- kernel/sched.c >/dev/null
On Ubuntu 8.10 x64, before (v1.6.2-rc2):
8.09user 0.04system 0:08.14elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+30952minor)pagefaults 0swaps
And with the patch:
1.50user 0.04system 0:01.54elapsed 100%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+30645minor)pagefaults 0swaps
On Fedora 10 x64, before:
8.34user 0.05system 0:08.39elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+29268minor)pagefaults 0swaps
And with the patch:
1.15user 0.05system 0:01.20elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+32253minor)pagefaults 0swaps
On Windows Vista x64, before:
real 0m9.204s
user 0m0.000s
sys 0m0.000s
And with the patch:
real 0m8.470s
user 0m0.000s
sys 0m0.000s
Signed-off-by: Rene Scharfe <rene.scharfe@lsrfire.ath.cx>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'imap-send.c')
0 files changed, 0 insertions, 0 deletions