topic Re: Memory Issues.... in Operating System - HP-UX

Memory Issues....

Dave Cast — Tue, 19 Apr 2011 13:53:12 GMT

Does anyone know where I could find an memory issue on an HPUX 11.31 system?

I've checked /var/adm/syslog
dameon.log
kern.log
syslog.log

I received an error in Data Protector - that said "cannot allocate shared memory segement"

I've not been able to find anything in the above logs....

Re: Memory Issues....

Michael Steele_2 — Mon, 11 Jul 2011 18:24:56 GMT

Did you also try the MP event logs?
or /etc/opt/resmon/logs?
or cstm memory diagnostic?
or kmeminfo?
or dmesg?
or for and mca in /etc/tombstones?

When you get a "cannot allocate shared memory segement"

http://h30499.www3.hp.com/t5/ITRC-Data-Protector-Forum/80-1003-Cannot-allocate-attach-shared-memory-IPC-Cannot-Create/m-p/3370868#M33490

Re: Memory Issues....

Bill Hassell — Tue, 19 Apr 2011 19:54:31 GMT

> I received an error in Data Protector - that said "cannot allocate shared memory segement"

Seems fairly straightforward. Check the shared memory kernel limit usage:

kcusage shmmax shmmni shmseg

This will show current and maximum settings. To look at the history for a day (-d) or for a month (-m):

kcusage -d shmmax shmmni shmseg

Data Protector needs a lot of shared memory space, especially for high performance tape drives. To see the current shared memory segments:

ipcs -bmop

Re: Memory Issues....

Vivek_Pendse — Fri, 22 Apr 2011 01:32:22 GMT

Check the MP logs. Filter with alert level of "Warning". Also, cstm can tell you some thing.
As per the error, this is some thing different than actual memory issue; kernel tuning for shared memory parameters can resolve this issue.

Thanks,
Vivek

Re: Memory Issues....

Dennis Handly — Sat, 23 Apr 2011 13:16:30 GMT

>cannot allocate shared memory segment
>I've not been able to find anything in the above logs.

This isn't a hardware error. It is a programming or sys admin error and as such, won't be logged.

What does "swapinfo -tam" show when you get the error?

Re: Memory Issues....

Manix — Sun, 24 Apr 2011 06:19:31 GMT

you may track some memory consumers in hpux.

UNIX95=1 ps -ef -o vsz,rsz,cpu,pid,wchan,comm | sort -rn 10 | head 10

ipcs -mac

should give you the owner and the creator of the process using that shared memory segment.

kcusage -d shmmax will so the usage of the segment & it`s size as well !!.

Thanks
Manix