topic Re: VMSTAT o/p in Operating System - HP-UX

VMSTAT o/p

Richard Dickinson_1 — Thu, 05 Feb 2004 06:16:54 GMT

Hi guys,
when I do vmstat -S I get two columns headed 'si' and 'so'. More box isn't paging but these figures are very high (50k). What do they mean (I've checked man but doesn't shed much light). Do I need to increase memory, even though my box isn't paging?

Many thanks in advance!

Re: VMSTAT o/p

RAC_1 — Thu, 05 Feb 2004 06:45:27 GMT

vmstat -S display si and so. si is swap in pages. i.e no. of pages swapped into the memory. so is o. of pages swapped out to the memory. If so no. is very high, your systsem is swapping and subsequently will slow down more and more.

Also look at the output of swinfo -tam and if all swap space is used, you will experience that system is very slow. Also check with glance -m and look for memory available. If is very low, you are experiencing the memory bottlneck. You may need to put some more RAM on system.

Re: VMSTAT o/p

Elena Leontieva — Thu, 05 Feb 2004 09:32:11 GMT

You can also run sar -w 5 5
If you see the value for swpot/s (the number of processes swapped out per second) is greater than zero, - you've got the swapping activity.

Elena.

Re: VMSTAT o/p

keith persons — Thu, 05 Feb 2004 13:19:08 GMT

Richard,

Are you running vmstat with a count of at least 2? If not, what you're seeing is the cumulative total since the last reboot. Run it with a count of 2 and what you get on the second line is the number of swapins/swapouts in the last line was displayed.

you can run it only once with the -S option, but you'll need to first run vmstat -z to sero the counters.

Keith