topic Memory in Operating System - HP-UX

Memory

System Dude_1 — Mon, 31 Dec 2001 18:13:38 GMT

Could anyone please elaborate below output as detail as possible

Memory Stat total used avail %used
physical 8192.0 4252.7 3939.3 52%
active virtual 2982.7 2953.1 29.6 99%
active real 1926.7 1920.3 6.4 100%
memory swap 6350.7 1505.0 4845.7 24%
device swap 8340.0 4590.3 3749.7 55%

Re: Memory

Sanjay_6 — Mon, 31 Dec 2001 21:09:25 GMT

Hi Jamaludin,

Try this link,

http://us-support3.external.hp.com/cki/bin/doc.pl/sid=6a769f711b43081c37/screen=ckiDisplayDocument?docId=200000052445864

Hope this helps.

Regds

Re: Memory

Roger Baptiste — Tue, 01 Jan 2002 07:08:29 GMT

Hi,

Memory Stat total used avail %used
<>

This points to physical memory on the
system. 8192-> 8Gb RAM is on system and
the remaining values shows the usage.

<>

This is the virtual pages used by the system.
Check memory management concepts to get an idea of virtual paging.

<>

This is actual memory which is "active",
i.e processes which are running and using the pages.

device swap 8340.0 4590.3 3749.7 55% >

This refers to the swap usage.

I would suggest to read the white papers of
memory management.

HTH
raj

Re: Memory

Tom Geudens — Tue, 01 Jan 2002 10:55:24 GMT

Hi,
The "Memory Management White Paper" can be found at http://docs.hp.com/hpux/pdf/5965-4641.pdf

Regards,
Tom

Re: Memory

System Dude_1 — Thu, 03 Jan 2002 06:07:31 GMT

Dear Friend,

Could anyone tell me how to increase the active virtual and real memory?

Memory Stat total used avail %used
physical 3072.0 1592.8 1479.2 52%
active virtual 380.1 329.5 50.6 87%
active real 28.6 21.4 7.2 75%
memory swap 2412.2 626.8 1785.4 26%
device swap 3402.0 1909.3 1492.7 56%

Re: Memory

Steven Gillard_2 — Thu, 03 Jan 2002 09:50:50 GMT

The "active" memory statistics are not a reflection on how much memory you have available, they indicate how much memory is actively being used by processes. Therefore they will increase as processes use more memory.

From the vmstat(1) man page:

Virtual pages are considered active if they belong to processes that are running or have run in the last 20 seconds.

So there's no need to be concerned about those 100% values for these stats - in fact that doesn't really tell you anything useful. Your system has plenty of free memory.

Regards,
Steve