Did you check how using sendfile() instead of write() effects this benchmark?
Andi
At 10:22 AM 5/19/2001 +0200, Sascha Schumann wrote:
> Hi,
>
> while looking at the strace output of readfile() in a CGI
> context, I noticed that the CGI code (a) uses stdio and (b)
> that it only outputs chunks with a maximum size of 16KB.
>
> The effect is clearly visible (reproducible, both tests were
> run with a warmed-up cache):
>
> $ time ./php-mmap-fwrite ./script >/dev/null
> 2.75user 0.47system 0:03.22elapsed 99%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (244391major+65minor)pagefaults 0swaps
>
> $ time ./php-mmap-write ./script >/dev/null
> 0.03user 0.01system 0:00.04elapsed 100%CPU (0avgtext+0avgdata
> 0maxresident)k
> 0inputs+0outputs (284major+64minor)pagefaults 0swaps
>
> E.g. using write() is about 80 times faster on Linux than the
> limited fwrite() version.
>
> fwrite() was probably chosen because it is a standardized
> function and is expected to work everywhere. So, what we
> would need to do is to add a check whether write() works on
> the system before using it.
>
> Are there any objections to such a change?
>
> - Sascha Experience IRCG
> http://schumann.cx/ http://schumann.cx/ircg
>
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