topic Re: memory in Operating System - HP-UX

memory

Keith Pothoven — Fri, 22 Aug 2008 14:44:04 GMT

I have an HPUX server that has 8GB of RAM.

$ grep Phys /var/adm/syslog/syslog.log
Aug 16 19:26:56 adminnew vmunix: Physical: 8376368 Kbytes, lockable: 6167732 Kbytes, available: 7162296 Kbytes

I am concerned when I look at the output from top:
Memory: 2537596K (1555608K) real, 11166040K (9579120K) virtual, 87508K free Page# 1/41

Is this only showing 4GB of physical memory, or am I looking at this wrong?

Re: memory

Andres_13 — Fri, 22 Aug 2008 16:08:37 GMT

Try:

# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 20480 784 19696 4% 0 - 1 /dev/vg00/lvol2
dev 20480 784 19696 4% 0 - 1 /dev/vg01/lvol1
dev 20480 784 19696 4% 0 - 1 /dev/vg01/lvol2
dev 20480 788 19692 4% 0 - 1 /dev/vg01/lvol3
dev 32768 787 31973 2% 0 - 1 /dev/vg02/lvol1
dev 12288 785 11495 6% 0 - 1 /dev/vg02/lvol2
dev 7168 783 6377 11% 0 - 1 /dev/vg02/lvol3
dev 6144 785 5355 13% 0 - 1 /dev/vg02/lvol4
reserve - 44800 -44800
memory 45647 21248 24399 47%
total 185935 72328 113579 39% - 0 -

Regards!

Re: memory

Tim Nelson — Fri, 22 Aug 2008 16:12:27 GMT

I believe top only shows what is active, same with vmstat.

If you have it, glance is a much better tool.

From a memory config standpoint, the only global item that would restrict amount of usable memory would be swap space. check with swapinfo -tam

Re: memory

Keith Pothoven — Fri, 22 Aug 2008 16:39:06 GMT

When you say that it is only showing "active" memory, what is that opposed to just the physical memory? I see that the "free" number is getting very small sometimes, but I do not ever see any paging.

Re: memory

Tim Nelson — Fri, 22 Aug 2008 16:40:56 GMT

I could be inaccurate on the active vs physical.(was hoping someone would chime in to correct me )

Eitherway.. Post the output for swapinfo -tam

Re: memory

Tim Nelson — Fri, 22 Aug 2008 16:44:17 GMT

Other post responses confirm that top is only displaying what is currently actively used. Not the total physical memory on the server.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=1158571

Re: memory

Court Campbell — Fri, 22 Aug 2008 16:45:25 GMT

According to the output from top it looks like you have 12GB of ram. So I will assume you have 8GB of ran and 4Gb of swap.

Re: memory

Keith Pothoven — Fri, 22 Aug 2008 16:47:44 GMT

# swapinfo -tam

Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 338 3758 8% 0 - 1 /dev/vg00/lvol2
dev 12000 335 11665 3% 0 - 1 /dev/vg00/Swap2
reserve - 3840 -3840
memory 8180 2501 5679 31%
total 24276 7014 17262 29% - 0 -

Re: memory

Court Campbell — Fri, 22 Aug 2008 16:52:06 GMT

http://forums11.itrc.hp.com/service/forums/questionanswer.do?threadId=245309

Re: memory

Court Campbell — Fri, 22 Aug 2008 16:55:00 GMT

Per the man page:

Memory Data
Includes virtual and real memory in use (with the amount of
memory considered "active" in parentheses) and the amount of
free memory.

Re: memory

Tim Nelson — Fri, 22 Aug 2008 17:14:49 GMT

Things look good to me...

If you have time. Download the trial of Glance. You will like it...

Re: memory

Tim Nelson — Fri, 22 Aug 2008 17:41:42 GMT

Let me completely rephrase my last post ( geez it must be Friday ).

1) yes all 8GB is seen by the system ( this is kinda what I meant in the last thread to answer your question )

2) From the swapinfo that you posted. At some point in the past there have been a few processes swapped out to disk, indicated by the MB used for each DEV.

Now this does not mean you are currently experiencing memory pressure, just that at one time you were. With 31% in psuedo swap I would say at the time of this snapshot your memory pressure is lower.

In order to review that, a duration of vmstat "po" column needs to be gathered and reviewed. ( but this was not your origional question so we'll leave for a different topic).

Re: memory

Asif Sharif — Sat, 23 Aug 2008 05:21:10 GMT

Using SAM
sam --> Performance Monitors --> System Properties --> Memory

There is script for check memory.

http://forums11.itrc.hp.com/service/forums/questionanswer.do?admit=109447626+1219472123042+28353475&threadId=946701

Try the following command and the output will give you all the hardware information about the Unix box.

echo "map selall info;wait infolog" | cstm > /tmp/cstm.txt

Regards,
Asif Sharif

Re: memory

Deepak Kr — Sat, 23 Aug 2008 13:11:42 GMT

As per swapinfo:
16GB swap is configured here.

See attched script to find physical memory installed.
its for hp-ux 11i

Re: memory

SKR_1 — Sun, 24 Aug 2008 03:49:15 GMT

1. dmesg | grep physical
2. swapinfo -tam
3. SAM

Anyone of the above can be checked to find physical memory.

Thanks

SKR