Fwd: RTEMS pthreads performance (was RTEMS vs other realtimeOperating Systems ..)

[Joel Sherrill]

Till Straumann wrote:
> 
> Joel Sherrill wrote:
> 
> >Till Straumann wrote:
> >
> >
> >>Kamen Penev wrote:
> >>
> >>
> >>
> >>>Hi!
> >>>
> >>>Looking at your work comparing RTEMS, RTLinux and vxWorks, I am wondering
> >>>about the unusually poor RTEMS+pthreads result for context switching on a
> >>>loaded system. Has this been explained (better yet fixed)by the RTEMS
> >>>development team?
> >>>
> >>>
> >
> >Which RTEMS version/target CPU/configuration?
> >
> 
> I believe it was ss-20011025 (I can re-run the test later today on a
> later version).

That is pretty old and I am 100% positive it predates the work
I did to improve results on your benchmark.  The ChangeLog entry
for that is 2002-07-01.

> The target was a 604 series PowerPC on a Motorola MVME23xx board.

Do you know what the test is doing?  Is it the same as yours?  Saying
something is slow doesn't help me much.  RTEMS usually performs
comparable to VxWorks on benchmarks.  But each time we hit a new
benchmark comparison, there is new data to optimize against.  

> -- Till
> 
> >
> >
> >
> >>>Thanks.
> >>>
> >>>Kamen Penev
> >>>Adept Technology
> >>>
> >>>
> >>>
> >>>
> >>>
> >>Good question. I am not using pthreads and the honest answer is "I dont
> >>know".
> >>I remember, however having brought this to Joel Sherrill's attention
> >>(back in 2001
> >>when I did the tests) and I believe he had some ideas about the cause...
> >>
> >>-- Till
> >>
> >>
> >
> >
> >

-- 
Joel Sherrill, Ph.D.             Director of Research & Development
joel at OARcorp.com                 On-Line Applications Research
Ask me about RTEMS: a free RTOS  Huntsville AL 35805
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