From: Chris Sandridge (c.a.sandridge++at++larc.nasa.gov)
Date: 07/10/2002 08:23:06
We have a pfCAVE application that exhibits sub-par performance on a
16-processor, 4-IR2 pipe, Onxy2 when other jobs are running on CPU 0. We
have observed, via top, that when long-running processes are running near
100% on CPU 0, we get jitter in any movement in our pfCAVE application -
instead of smooth rotations, translations, we get rapid starts and
stops. But when the job on CPU 0 is finished, the jitter goes away. Jobs
running on all CPUs other than 0 have no affect on the pfCAVE application.
Is there something in Performer that needs CPU 0 and is there anyway to
prevent other processes from interrupting that need. We still haven't
determined exactly what causes the jitter, just that the load on CPU 0
seems to have a connection. Any ideas?
Thanks,
Chris
___________________________________________________________________
Chris A. Sandridge
Immersive Design and Simulation Lab
Analytical and Computational Methods Branch
M.S. 240, NASA Langley Research Center
3 Langley Blvd., B1229, Rm. 237
Hampton, VA 23681
email: c.a.sandridge++at++larc.nasa.gov
phone: (757) 864-2816
fax: (757) 864-8912
This archive was generated by hypermail 2b29 : Wed Jul 10 2002 - 08:23:05 PDT