HP3000-L Archives

June 2002, Week 4

HP3000-L@RAVEN.UTC.EDU

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From:
Robert Mills <[log in to unmask]>
Reply To:
Robert Mills <[log in to unmask]>
Date:
Fri, 28 Jun 2002 12:11:42 +0100
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---------->> John Korb said:
Every once in a while (it has happened five times in four months) a Samba
process apparently decides to loop and eats as much of the CPU as it can.
One rather idle day (our production hours are from mid afternoon to oh dark
thirty) I decided to let it run for a few hours to see if it would
eventually terminate or return to good behavior.  No such luck.

I don't know what causes the looping, and it is infrequent, so I can easily
live with it.  I'm wondering if anyone else using Samba 2.0.10 has
experienced this.
---------->>

I've had this happen with version 2.0.7 on many occasions on our 979/400
where CPU can go up to 96%.

We first thought that it was because we were running Samba under control of
INETD. So we pulled it out of there and ran the JSMB207 and JNMB207 jobs,
from SAMBA.SYS, which made no difference.

Further investigation revealed that it only occurred when a PC application
had problems with some data contained in the file it was importing. The
application threw up a dialog box indicating what it didn't like and then
terminated the import process (think that it's not closing the file before
killing the import process). Samba, not knowing that it has finished with
the file, just sits there waiting for the next read.

Extrapolating, from information obtained in other postings on this list, I
think that MPE assumes that Samba is stalled due to lack of resources and
thus keeps increasing it's CPU priority to try and clear it thus compounding
the problem.

Our current work-around is to keep an eye on the CPU level for Samba and
when it gets to high we kill and restream the JSMB207 job.

regards,

Robert W.Mills
Systems Development Manager
Windsong Services

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