Hi all,

I am trying to run multi-thread application built on HP-UX 11.11 (PA)
on Itanium machine (HP-UX 11.22i)
When configured to operate in single thread it runs ok (although not as
fast as we expected).
When changing configuration to multi-threaded mode huge performance
degradation occures (10-15 times!!).

It doesn't matter if we change thread_scope from PTHREAD_SCOPE_PROCESS
to PTHREAD_SCOPE_SYSTEM ,
policy from SCHED_TIMESHARE to SCHED_OTHER
or detachstate from PTHREAD_CREATE_JOINABLE to PTHREAD_CREATE_DETACHED.

Does anyone have an idea how this can be fixed/tuned ?

Thanks and best regards,
Evgeny

In article <1115203732.097420.23140@z14g2000cwz.googlegroups.com>, EvgK wrote:
> Hi all,
> 
> I am trying to run multi-thread application built on HP-UX 11.11 (PA)
> on Itanium machine (HP-UX 11.22i)
> When configured to operate in single thread it runs ok (although not as
> fast as we expected).
> When changing configuration to multi-threaded mode huge performance
> degradation occures (10-15 times!!).
> 
> It doesn't matter if we change thread_scope from PTHREAD_SCOPE_PROCESS
> to PTHREAD_SCOPE_SYSTEM ,
> policy from SCHED_TIMESHARE to SCHED_OTHER
> or detachstate from PTHREAD_CREATE_JOINABLE to PTHREAD_CREATE_DETACHED.
> 
> Does anyone have an idea how this can be fixed/tuned ?

Not that it solves your problem, but isn't it generally recommended to be
running 11.23 on Itanium systems? 11.22 is not really being patched that I have
seen...

Kevin

-- 
Unix Guy Consulting, LLC
Unix and Linux Automation, Shell, Perl and CGI scripting
http://www.unix-guy.com

My mistake, we have upgraded to 11.23 already - all these happens on
11.23...

Do you have much in the way of mutex contention in your threaded
application? It might be interesting to compare a tusc trace of the
application running under PA-RISC with a tusc trace of the same
application running under the Aries emulator on IPF.

I suppose that the usual song and dance about making sure you have the
latest versions of Aries intalled would apply, even if you are already
on 11.23.

rick jones
-- 
Wisdom Teeth are impacted, people are affected by the effects of events.
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to raj in cup.hp.com  but NOT BOTH...