Pedro Gonnet wrote:
Hi guys,
I'm currently working on a shared-memory parallel Molecular Dynamics
simulation library (http://mdcore.sourceforge.net/) geared towards
multi-core systems.
The library uses pthreads (plus some OpenMP for some simple loops) and
uses pthread_cond_wait and pthread_cond_signal to coordinate a group of
worker threads.
I've been profiling the library on different machines and kernels and
have noticed that in many cases there are significant (several ms,
measured with Intel's Vtune-thing) lags between calls to
pthread_cond_signal and the waiting thread actually getting back to
work.
At what priority are the worker threads running ?
In order to schedule these threads by the real-time part of the CFS
scheduler they should run at lest at a priority of 20 (rt_sched_class)
Regards
--Armin
I've tried the Ubuntu -rt and -preempt kernels, and the whole simulation
runs twice as slowly, despite following the advice given here:
https://rt.wiki.kernel.org/index.php/HOWTO:_Build_an_RT-application
My question is the following: which kernel (or set of configuration
options) will minimize these latencies? And if linux-rt is the answer,
in what ways do I have to be careful when porting the simulation for
this kernel?
Cheers and thanks,
Pedro
--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
--
To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
