Junio C Hamano <gitster@xxxxxxxxx> writes:
> René Scharfe <rene.scharfe@xxxxxxxxxxxxxx> writes:
> ...
>> In any case, there is also memmem(), which uses the same fast algorithm
>> as strstr() in recent glibc versions. Like this?
>
> Thanks; it would be nice to bench this change.
With memmem() patch applied on top of [1-4/4], the same test as described
in the commit log message of [4/4] which was:
$ 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'd expect a larger
file may see a bigger performance boost.
(With memmem() patch, best of 5 runs)
2.46user 0.15system 0:02.62elapsed 99%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+0outputs (0major+49698minor)pagefaults 0swaps
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