topic Re: Memory usage in Operating System - HP-UX

Memory usage

Ian Jones_1 — Mon, 01 Mar 2010 11:15:40 GMT

HPUX11v3
swapinfo show 67% used by glance showing 100%?

Kb Kb Kb PCT START/ Kb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8388608 39472 8349136 0% 0 - 1 /dev/vg00/lvol2
reserve - 8332084 -8332084
memory 7948284 5320496 2627788 67%

Re: Memory usage

Dennis Handly — Mon, 01 Mar 2010 11:39:27 GMT

Please provide the "swapinfo -tam" output.

Re: Memory usage

Ian Jones_1 — Mon, 01 Mar 2010 11:44:04 GMT

swapinfo -tam

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 8192 39 8153 0% 0 - 1 /dev/vg00/lvol2
reserve - 8120 -8120
memory 7762 6132 1630 79%
total 15954 14291 1663 90% - 0 -

Re: Memory usage

Dennis Handly — Mon, 01 Mar 2010 11:51:55 GMT

You are now using 79% of your pseudo-swap. I don't know what glance was measuring, memory usage?

Re: Memory usage

Ian Jones_1 — Mon, 01 Mar 2010 12:20:35 GMT

Now up to 97%, but i see the dev swap is still unused? should pages now be moved to dev swap?

Re: Memory usage

Dennis Handly — Mon, 01 Mar 2010 12:24:34 GMT

>I see the dev swap is still unused? should pages now be moved to dev swap?

You have reserved the space but haven't used it yet. Only when your processes start using more of their reserved virtual memory will it be paged out.

Re: Memory usage

Ian Jones_1 — Mon, 01 Mar 2010 12:29:04 GMT

So adding more swap space will not help the fact memory is being used more than i had expected?

Re: Memory usage

Dennis Handly — Mon, 01 Mar 2010 12:33:36 GMT

>So adding more swap space will not help the fact memory is being used more than I had expected?

Adding more swap will let more processes run. You have only used 38 Mb of swap so you probably aren't doing lots of page outs yet.

What were your expectations?

Re: Memory usage

Ian Jones_1 — Mon, 01 Mar 2010 13:25:21 GMT

I was not expecting all the memory to be used, but if it was then swap should be taking the load off memory.
is there a utility to see who has what memory allocated?
I'm getting errors from lots of processes i.e. /usr/bin/ps: out of memory

Re: Memory usage

Dennis Handly — Mon, 01 Mar 2010 17:24:12 GMT

>I was not expecting all the memory to be used, but if it was then swap should be taking the load off memory.

You have reserved all of device and pseudo swap. This has to be increased.
You could also be using memory for the file cache, etc.

>is there a utility to see who has what memory allocated? I'm getting errors from lots of processes i.e. ps: out of memory

You can use ps(1) to see what processes are using. But you need more swap.
See these recent threads:
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1411169
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1411227
http://forums.itrc.hp.com/service/forums/questionanswer.do?threadId=1411362

Re: Memory usage

Ian Jones_1 — Tue, 02 Mar 2010 08:32:33 GMT

I will check those out Thanks