topic Re: Command to find memory usage in Operating System - HP-UX

Command to find memory usage

Shivkumar — Tue, 06 Jun 2006 13:44:40 GMT

Hi,

I want to know the command to find out the total use of memory (RAM) without using the Glance or GlancePlus ?

Is there a command available for this ?

Thanks,
Shiv

Re: Command to find memory usage

Mustafa Gulercan — Tue, 06 Jun 2006 13:49:23 GMT

hi;

To Show Free memory on system:
# vmstat 1 2 | tail -1 | awk '{printf "%d%s\n", ($5*4)/1024, "MB" }'

To Show Top Memory Processes:
# UNIX95= ps -el -o pid,comm,sz | grep -i -v pid | sort -nr -k 3,3 | head -15

This shows the top 15 processes for memory utilisation.

# vmstat 1 1000 >> /tmp/vm.out

This will collect 1000 samples of vmstat output with an interval of 1 sec

# vmstat 1 >> /tmp/vmstat.out

The above command keeps collecting the vmstat output infinitely

regards;
mustafa

Re: Command to find memory usage

Steven E. Protter — Tue, 06 Jun 2006 15:20:48 GMT

Shalom Shiv,

I respectfully submit swapinfo -tam as an alternative.

sar can be used to monitor various figures concerning memory use.

I also know I owe you an email. Personal situation is a bit hairy right now. Don't worry, I'll get to it.

SEP

Re: Command to find memory usage

Shivkumar — Tue, 06 Jun 2006 15:40:33 GMT

I exexuted both commands and got the below output:-

# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 1024 0 1024 0% 0 - 1 /dev/vg00/lvol2
dev 1024 0 1024 0% 0 - 1 /dev/vg00/swap02
dev 512 0 512 0% 0 - 1 /dev/vg00/swap03
reserve - 130 -130
memory 1469 533 936 36%
total 4029 663 3366 16% - 0 -

# vmstat 1 2 | tail -1 | awk '{printf "%d%s\n", ($5*4)/1024, "MB" }'
1130MB
#

Why there is too much difference between 2 command output ?

In the output of "swapinfo -tam" Is 4.029GB total available RAM or 1.469GB ?

Thanks,
Shiv

Re: Command to find memory usage

Ninad_1 — Tue, 06 Jun 2006 15:57:36 GMT

Shiv,

swapinfo will show swap space usage.
Also sar will not show memory usage in HP [ In solaris sar -r shows memory usage :) ]
So you have only the following options
Glance - which you do not want to use [ I dont know why ]
vmstat - as suggested above or
UNIX95= ps -e -o "sz" | awk 'BEGIN {tot=0} {tot+=$1} END {print tot*4/1024,"MB"}'
I dont remember if there is any text appearing in the first line in output of
UNIX95= ps -e -o "sz"
Please check - if text appears in 1st line then modify above as
UNIX95= ps -e -o "sz" | tail +2 | awk 'BEGIN {tot=0} {tot+=$1} END {print tot*4/1024,"MB"}'

But again as there are shared memory segments which may be shared by multiple processes the memory calculated as above is approximate. You can compare with Glance once.

Regards,
Ninad

Re: Command to find memory usage

Arunvijai_4 — Tue, 06 Jun 2006 22:44:57 GMT

Hi Shiv,

You should read this paper to understand how memory is used by HP-UX,

ftp://eh:spear9@hprc.external.hp.com/memory.htm

-Arun

Re: Command to find memory usage

Chauhan Amit — Tue, 06 Jun 2006 23:46:09 GMT

# echo "freemem/D" | adb -k /stand/vmunix /dev/kmem

The output is the free memory in pages. Multiply the resulting number with 4 to get the free memory in Kbytes.

# echo "phys_mem_pages/D" | adb -k /stand/vmunix /dev/kmem

The output is the total memory in pages.Multiply the resulting number with 4 to get the free memory in Kbytes.

Used memory=Total memory-Free memory

grep -i physical /var/adm/syslog/syslog.log ---> To get physical RAM on system.

You can use this tool also:
/usr/contrib/Q4/bin/kmeminfo

-AMit

Re: Command to find memory usage

Shivkumar — Wed, 07 Jun 2006 20:12:01 GMT

Arun,

Thanks for the link provided to me. It is very useful.

Regards,
Shiv

Re: Command to find memory usage

Chauhan Amit — Wed, 07 Jun 2006 23:22:17 GMT

Check out this thread as well,

"Easy command line way to check memory usage"

http://forums1.itrc.hp.com/service/forums/parseCurl.do?CURL=%2Fcm%2FQuestionAnswer%2F1%2C%2C0xa56442308663d611abdb0090277a778c%2C00.html&admit=-682735245+1149740463211+28353475