cancel
Showing results for 
Search instead for 
Did you mean: 

swapped out

 
adarsh_4
Frequent Advisor

swapped out

i have open vms7.3 and at times it go slow. i did a show system and i have copied it to the attachment. it says something about swapped out. what can be the problem and how can we solve it
20 REPLIES 20
Hein van den Heuvel
Honored Contributor

Re: swapped out

Well, it looks like those processes are swapped out as the system tried to free up memory. The processes that are not swapped out are trimmed down to bare bones.

Next command you want to use is SHWO MEMORY/FULL.

It looks like the memory is totally overcommited. How much is there? What is it used by?

My guess? You have some large (RDB?) global sections still stuck in memory waiting for a Database to shut down or something like that.

Maybe that INSTALL LIST /GLOBAL can identify some good sized chunks of pages under the pgltcnt columns? check also for pending delete?

Or maybe on the last reboot the system came up with a good chunk of memory missing?

Hope this helps,
Hein.


Jon Pinkley
Honored Contributor

Re: swapped out

Short answer: You need more memory.

You have many processes in COMO (Waiting for CPU, but outswapped) and RWMPB (Resource Wait, Modified Pagewriter Busy).

Solution: Buy more memory, or reduce the load.

Jon
it depends
adarsh_4
Frequent Advisor

Re: swapped out

thanks for the advise.
Robert Gezelter
Honored Contributor

Re: swapped out

dharsh,

As Hein and Jon have noted, it is quite possible that there is simply a need for more memory than there is presently in the system.

However, the original post did not specify the hardware or architecture involved.

It also mentioned nothing about what images are being run on this system.

Before purchasing additional memory, I would investigate tuning the system. I have seen many situations where there are things that can be done to the system software configuration to address this problem.

As Hein mentioned, a SHOW MEMORY/FULL is certainly a starting point. A look at the images being run by different users is also an important step.

I once had a client who had almost the precisely same problem. System performance was unacceptable, and they were getting ready to ask upper (non-IT) management for significant funds to increase memory capacity or purchase a large system.

However, they decided to ask me to take a look at the system. I found a large number of users running the same, multi-thousand page image. I checked the image, installed it, and then watched all of the swapping and paging stop as if by magic.

Needless to say, the memory expansion project never happened.

The moral of the tale: Tune before purchasing hardware, then one better knows if one actually NEEDS the extra hardware.

- Bob Gezelter, http://www.rlgsc.com
Wim Van den Wyngaert
Honored Contributor

Re: swapped out

May be a process took A LOT of memory and then finsihed and this before you looked.
Check in accounting/full the field "peak working set".

Wim
Wim