Swap Util 51%

[Vic S. Kelan]

A quick one, if I have 24GB memory and the same amount for device swap and pseudo swap enabled. No paging or device swap utilized

What does "Swap Util 51%" mean in glance?

What percentage of what is 51%

Pleaseeee
Thanks!!

[Jeff Schussele · Accepted solution]

Hi Vic,

Simply means you've "reserved" 51% of available swap for the processes running.
Every process that wants to run *must* make a reservation in swap hotel. The difference is they *really* hope they'll never check in.
Use sar, glance or vmstat to see if you're actually paging out...errr...checking in.

Cheers,
Jeff

[A. Clay Stephenson]

In your case, pseudoswap serves no purpurpose. It only has meaning when RAM < swapspace. All it's really doing for you at this point is adding confusion to your memory usage --- although it's not actually using memory.

[Steven E. Protter]

Shalom,

As noted, it means very little.

What as a sysadmin you should be concerned with is paging.

If that reserve starts to get used constantly, performance will get very, very slow.

vmstat can help you see this.

http://www.hpux.ws/system.perf.sh

Can help you see this and other issues.

SEP

[Vic S. Kelan]

Thanks all, and Jeff, your analogy was funny I must use it when describing this to someone...
Bye