Hi Robert,
What tool are you using to monitor and change affinity of the threads?
Its sounds something that would be useful.
A small program that I wrote myself. I attached to the email.
Also when I change the threading modes I don't see much difference in
the performance of cull and draw.
This suggests that performance bottleneck isn't pure CPU performance -
its may well be that memory bandwidth and latency is the bottleneck,
or the OpenGL fifo being filled and blocking things. I don't think
the GPU itself will be bottleneck.
But why is there a performance difference between osgproducerviewer and
osgviewer when other threading modes are used? Do you observe such a
difference?
Monday I'll look into it again and make a more formal test using the
paths to be sure that camera is in the same position. What threading
model should I choose to make a fair comparison between
osgproducerviewer and osgviewer?
Boy there is few extra options since I last updated drivers and
tweaked xorg.conf.
I have two graphics cards but SLI is disabled
and only one of the cards' outputs are used.
Using twin view on a dual card system is a bit of shame, unleash the
poor machine - configure it so that each card has a single ouput.
There are example configs up on the OSG wiki.
You can mix and match twin view and dual cards as well - I have four
cards in front of me for testing just this set up. I haven't tried
it with osgViewer yet though... Will post pics once I have.
All configurations except the current one had a problem. For the moment
I just leave it as it is not to create more problems for myself.
Tugkan
#include <stdio.h>
#include <stdlib.h>
#include <sched.h>
#define SUSE9
int main( int argc , char* argv[] )
{
if ( argc < 2 )
{
printf("schedTool priority cpu[0,1,...] scheduler[0:SCHED_OTHER
1:FIFO 2:RR]\n");
return -1;
}
int prio = atoi(argv[1]);
int CPU = atoi( argv[2] );
int scheduler = atoi( argv[3] );
for ( int i = 0 ; i < argc - 4 ; i++ )
{
int pid = atoi(argv[i+4]);
printf("pid = %i\n" , pid );
printf("Current scheduler %i\n" , sched_getscheduler(pid));
sched_param param;
param.sched_priority = prio;
if ( sched_setscheduler( pid , scheduler, ¶m ) != 0 )
{
perror("Scheduler change failed");
}
else
{
printf("Scheduler changed to %i with priority %i \n" ,
sched_getscheduler(pid),prio);
}
#ifdef SUSE9
cpu_set_t cpuSet;
__CPU_ZERO( &cpuSet );
__CPU_SET( CPU , &cpuSet );
if ( sched_setaffinity( pid , sizeof(cpuSet) , &cpuSet ) != 0)
{
perror("Affinity change failed");
}
else
{
printf("CPU affinity set to %i\n" , CPU );
}
#elif defined SUSE8
unsigned long mask = 0x01;
mask <<= CPU;
if ( sched_setaffinity(pid, sizeof(mask), &mask) != 0)
{
perror("Affinity change failed");
}
else
{
printf("CPU affinity set to %i\n" , CPU );
}
#endif
}
return 0;
}
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