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Conference turris::digital_unix

Title:DIGITAL UNIX(FORMERLY KNOWN AS DEC OSF/1)
Notice:Welcome to the Digital UNIX Conference
Moderator:SMURF::DENHAM
Created:Thu Mar 16 1995
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:10068
Total number of notes:35879

9807.0. "Swapping issues under 3.2G/4.0A" by NNTPD::"[email protected]" (Jason Orendorf) Tue May 13 1997 17:58

I've got a customer who's seeing some strange behavior under 3.2G as well as
4.0A.  It seems that on occasion, some processes will be swapped out and 
never become active again.  He's seen this with shells, rdist, and (most
importantly) portmap.  With portmap, ps shows the process exists:
USER  PID %CPU %MEM   VSZ  RSS TTY  S  STARTED    TIME COMMAND
root 5473  0.0  0.0 1.36M   0K ??  IW  Mar 12  0:33.99 /usr/sbin/portmap
but there were tons of messages in /var/adm/messages:
Mar 12 01:49:32 augustus vmunix: Portmapper not responding; giving up
Mar 12 01:49:47 augustus vmunix: Portmapper not responding; still trying

These messages continued until he manually killed pormap & restarted in
(along with mountd & nfsd).  I had him run a performance data collection
script & most of the time there are plenty of free pages.  There are
occasional periods of extremely high CPU usage (70%user, 30%system, 0%idle)
but that doesn't seem to be the norm.  The system has been up for awhile
(80 days), but I'd rather not suggest a reboot as the cure.

Any ideas/suggestions appreciated.

-Jason

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9807.1NNTPD::"[email protected]"Shashi MangalatSat May 17 1997 00:487
Without looking at the system or a crash dump it is difficult to say why
the processes are not waking up.  The fact that you can kill it implies
that the problem may be elsewhere and not with task swapping (you have to
swapin the process to kill it).

--shashi
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