topic Re: View swaping activity in Operating System - HP-UX

View swaping activity

Marcelo De Florio_1 — Mon, 30 Sep 2002 17:45:32 GMT

How can i to see swaping activity (without glance) ?

Regards.

MDF

Re: View swaping activity

steven Burgess_2 — Mon, 30 Sep 2002 17:46:32 GMT

Hi

You can view usage with

swapinfo -tam

HTH

Steve

Re: View swaping activity

Joaquin Gil de Vergara — Mon, 30 Sep 2002 17:47:32 GMT

see man pages for sar

-w option shows you swap activity

# sar -w 1 10
(monitor swap activity each 1 second during 10 seconds)

Re: View swaping activity

MANOJ SRIVASTAVA — Mon, 30 Sep 2002 17:52:03 GMT

Hi Marcelo

Here is a smal c Script which you can comiple and run , it will give the correct memory information as requierd :

Memory Stat total used avail %used
physical 32764.0 8058.4 24705.6 25%
active virtual 531.3 128.9 402.4 24%
active real 597.0 136.0 461.0 23%
memory swap 26522.5 3738.2 22784.3 14%
device swap 2378.0 2365.5 12.5 99%

Also ofcouse swapinfo does the job too .

I ahve attached the program which you can comiple in your machine.

Manoj Srivastava

Re: View swaping activity

Marcelo De Florio_1 — Mon, 30 Sep 2002 17:55:05 GMT

Steven:

# swapinfo -tam
Mb Mb Mb PCT START/ Mb
TYPE AVAIL USED FREE USED LIMIT RESERVE PRI NAME
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol2
dev 4096 0 4096 0% 0 - 1 /dev/vg00/lvol9
reserve - 1784 -1784
total 8192 1784 6408 22% - 0 -

I execute this command, how can i interpreted this output ?

PCT USED, mean Swap Space Used, because /dev/vg00/lvol2 and lvol8 have 0% USED, what are the different between both ?

MDF

Re: View swaping activity

Pete Randall — Mon, 30 Sep 2002 17:56:37 GMT

Hi,

Try:

sar -w (not so good)
vmstat (preferred)

Pete

Re: View swaping activity

Marcelo De Florio_1 — Mon, 30 Sep 2002 18:01:40 GMT

Manoj:
I execute this program, so i get this result:

Memory Stat total used avail %used
physical 4092.0 4016.9 75.1 98%
active virtual 626.5 126.2 500.3 20%
active real 1093.3 132.9 960.4 12%
memory swap 0.0 0.0 0.0 nan%
device swap 8192.0 1786.8 6405.2 22%

How can i interpreted each row ?

Regards.

MDF

Re: View swaping activity

steven Burgess_2 — Mon, 30 Sep 2002 18:08:38 GMT

Hi

Alternatively, the number of free swap pages can be seen through adb.
Do the following:

adb -k /hp-ux /dev/kmem
swapspc_cnt /D
swapspc_cnt /D

This will display the number of free swap pages. Multiply the number
returned by 4096 for the number of free swap bytes.

HTH

Steve

Re: View swaping activity

Rita C Workman — Mon, 30 Sep 2002 18:09:45 GMT

Marcelo,

Based on what I could see on the swapinfo -tam (which along with vmstat) is the commands I use..

lvol2 is your default area and it would seem that lvol9 was also set up for swap.

The %used...showing 0....says you are not swapping. Like I said you could run something like vmstat -nS and note fields pg_in and pg_out. If these are also 0 than ..again.. you are not paging/swapping. You are looking good !
Note...when running vmstat you need to clear the totals occassionaly to ensure your not reflecting old info...vmstat -z

The last line shows the total % used. Now this is the overall average of disk/fs/memory. In your case it shows 22% overall used. So you are barely making the system sweat !!

Hope that helps !
Rit

Re: View swaping activity

steven Burgess_2 — Mon, 30 Sep 2002 18:10:18 GMT

Marcelo

Here is a white paper on memory management

http://www5.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000009254450

do a

man swapinfo

For an explanation on the swapinfo command

HTH

Steve

Re: View swaping activity

steven Burgess_2 — Mon, 30 Sep 2002 18:11:36 GMT

Hi

And shared memeory

http://www5.itrc.hp.com/service/cki/docDisplay.do?docLocale=en_US&docId=200000062685991

HTH

Steve

Re: View swaping activity

MANOJ SRIVASTAVA — Mon, 30 Sep 2002 18:15:31 GMT

Hi

This is simple , your device swap is 8.0 gb out of which only 22% is used .

Manoj Srivastava