Pthreads performance
Maxim Sobolev
sobomax at portaone.com
Fri Feb 11 15:11:34 GMT 2005
Maxim Sobolev wrote:
> Hi,
>
> Note: I am purposely posting this to developers to avoid banging into
> "FreeBSD 5/6 is slow" drum. My pthreads knowellege is pretty basic, so
> that it's possible that this all is false alarm.
Grrr, e-mail auto-completion suxxxor. :-/
-Maxim
>
> I've found a post on some of Russian technical forums in which author
> tries to compare performance of basic synchronisation primitives in
> various threading packages available on FreeBSD. The interesting part is
> that the linuxthreads clearly wins by a high margin - difference between
> it and the next follower (kse) is almost 3x. I had tried to find some
> error in the program logic, but failed. Another interesting thing is
> that libthr, which is conceptually very close to linuxthreads, provides
> worst result, being 8x slower than LT and almost 3x slower than kse/c_r.
>
> For those who can read Russian the original post can be found here:
> http://www.opennet.ru/base/sec/test_freebsd_threads.txt.html
>
> Following is result of the run on my 5.3-STABLE/UP.
>
> -bash-2.05b$ time ./aqueue_c_r -n 10000000
> pusher started
> poper started
>
> real 0m17.826s
> user 0m17.766s
> sys 0m0.048s
> -bash-2.05b$ time ./aqueue_thr -n 10000000
> pusher started
> poper started
>
> real 0m46.227s
> user 0m18.706s
> sys 0m27.423s
> -bash-2.05b$ time ./aqueue_kse -n 10000000
> pusher started
> poper started
>
> real 0m15.477s
> user 0m15.432s
> sys 0m0.009s
> -bash-2.05b$ time ./aqueue_linuxthreads -n 10000000
> pusher started
> poper started
>
> real 0m6.118s
> user 0m2.217s
> sys 0m0.932s
> -bash-2.05b$
>
> Test case and script that compiles it can be found there:
>
> http://www.portaone.com/~sobomax/aqueue.c
> http://www.portaone.com/~sobomax/build.sh
>
> -Maxim
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