Did you check how using sendfile() instead of write() effects this benchmark?


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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