Re: iR Glitch Revisited...
Angus Dorbie (dorbie++at++multipass.engr.sgi.com)
Fri, 31 Oct 1997 22:13:56 -0800
On Oct 30, 8:50am, Jan Barglowski wrote:
> Subject: iR Glitch Revisited...
> Hello!
>
> I'm still trying to fix a drawing "glitch" that happens about every 2
> seconds. Here's what I've done so try and narrow it down:
> - Everything in the FAQ: no desktop, turned off unecessary chkconfigs
> (including nfs), NOINTR in irix.sm, no extra graphics processes
> (xclock, xload, gr_osview, etc...), no remote logins.
> - I try to lock down the cpus and prioritize the processes to realtime
> (+35), but to no avail. Perfly crashes when I use the -L -N options
> as root (but either by itself doesn't crash) I can run perfly with
> -L, then raise the priority via npri, but the glitch still happens
> (and the machine locks when closing perfly) This is probably another
> problem in itself :-(
>
> An output of top while running perfly (no prioritize procs) looks like:
> ---
> IRIX64 cyclops 6.2 03131016 IP25 Load[0.42,0.22,0.08] 08:16:04 102 procs
> user pid pgrp %cpu proc pri size rss time command
> root 1001 996 20.10 * 79 17741 798 0:04 perfly_ogl
> root 1003 996 10.32 * 61 17609 659 0:02 perfly_ogl
> root 999 996 9.49 * 66 17609 656 0:02 perfly_ogl
> root 996 996 9.10 * 73 17594 165 0:02 perfly_ogl
> root 1000 996 8.60 * 60 17065 129 0:01 perfly_ogl
> root 998 996 5.84 * 67 17065 127 0:01 perfly_ogl
> root 1002 996 4.99 * 60 17065 128 0:00 perfly_ogl
> root 1004 996 2.92 * 60 17065 108 0:00 perfly_ogl
> jan 984 984 2.85 1 61 119 80 0:00 top
> root 22 0 2.56 * +39 0 0 0:20 sockd
> root 1005 996 0.62 * 60 17065 109 0:00 perfly_ogl
> root 770 770 0.32 * 60 865 540 0:04 Xsgi
> jan 924 924 0.13 * 60 264 157 0:00 xterm
> root 398 0 0.05 * 39 98 54 0:00 sysctlrd
> root 997 996 0.02 * 39 16987 57 0:00 perfly_ogl
> root 260 0 0.00 * 61 0 0 0:00 nfsd
> ---
>
> My guess is some other system process is taking a hit on the resources
> every once in a while. Suspicious processes are sockd and rtnetd, of
> which I can find little info and have had no luck downgrading priority.
>
> pfStats show the procs easily maintaining 60Hz, but the glitch
> "reorganizes" the staggered proc display every couple of seconds. The
> "Misses" row shows on average 2 misses under "total", but nothing under any
> of the processes. Running APP_CULL_DRAW, Free Run, video at 60Hz.
>
> More stuff: iR, 16 cpus, IRIX 6.2, Performer 2.1
>
> Someone mentioned a program to monitor processes that might be interfering,
> but I lost my email (long story) and the Performer archives don't have
> the September messages yet.
>
> Thanks for any suggestions!
>
The top output suggests you may not have CPU lockdown working.
Cheers,Angus.
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on Mon Aug 10 1998 - 17:56:09 PDT