Re: [gtk-list] Select timing, please test this program (was: Signals in Gtk+)

[Jan Gentsch <gentsch ifm uni-hamburg de>]

Sascha Ziemann wrote:

> Tim Janik <timj@gtk.org> writes:
>
> | since you use system calls like select() or alarm() for your timers
> | anyways, the highest accuracy to gain is 20ms or 50Hz on intel and
> | 10ms or 100Hz on alpha, iirc.
>
> The Intel value is correct, but I have no idea why. Does anybody know?
>
> I got the following results:
>
> Linux Pentium II 333:
> ---------------------
> starting test 1 with 5000 iterations ... done
> starting test 2 with 5000 iterations ... done
> results for: Linux olivia 2.0.35 #13 Tue Aug 18 09:25:29 MEST 1998 i686 unknown
> select without timeout:    f1 =  154985.75 Hz     d1 =   0.006452 ms
> select without reading:    f2 =      49.66 Hz     d2 =  20.135937 ms
>

Linux Pentium II 266:
---------------------
starting test 1 with 5000 iterations ... done
starting test 2 with 5000 iterations ... done
results for: Linux atlantic 2.0.35 #136 Mon Jul 27 11:27:51 MEST 1998 i686 unknown

select without timeout:    f1 =  129516.99 Hz     d1 =   0.007721 ms
select without reading:    f2 =      50.00 Hz     d2 =  19.998879 ms

Linux Pentium  100
---------------------
starting test 1 with 5000 iterations ... done
starting test 2 with 5000 iterations ... done
results for: Linux suez 2.0.35 #130 Mon Jul 27 11:06:31 MEST 1998 i586 unknown
select without timeout:    f1 =   43188.73 Hz     d1 =   0.023154 ms
select without reading:    f2 =      50.00 Hz     d2 =  19.998504 ms

Linux Pentium  150
---------------------
starting test 1 with 5000 iterations ... done
starting test 2 with 5000 iterations ... done
results for: Linux pacific 2.0.35 #142 Mon Jul 27 11:49:42 MEST 1998 i586 unknown
select without timeout:    f1 =   58109.75 Hz     d1 =   0.017209 ms
select without reading:    f2 =      50.00 Hz     d2 =  19.998955 ms


Sun (gcc / native wouldn't compile)
--------------------
starting test 1 with 5000 iterations ... done
starting test 2 with 5000 iterations ... done
results for: SunOS ifmsun8 4.1.3 1 sun4m
select without timeout:    f1 =   13041.69 Hz     d1 =   0.076677 ms
select without reading:    f2 =      99.87 Hz     d2 =  10.013151 ms

AIX (neither gcc / native would compile)
----------------------