On Thu, 28 Aug 2003, Mike Lovins wrote: > Could someone help me out? we are in the process of purchasing a zSeries and plan > on running Linux. I recieved this email about performance problems on the zSeries > due to working set size, what is the working set size? and on what size Zseries are > having the problem?
The term working set size relates to the amount of real storage your application needs. It might have, say, 128 Mbytes available to it, but actively use only a small part of it. Ironically, Linux can perform better in a small amount of virtual storage when run under VM: if it has 128 Mbytes it will tend to use it all for file bufferes. This impacts VM and can cause excessive VM paging. The solution can be to give it less storage, not more because this can reduce VM paging while not causing Linux to page much more. It's always the case that your milage will vary. -- Cheers John. Join the "Linux Support by Small Businesses" list at http://mail.computerdatasafe.com.au/mailman/listinfo/lssb Copyright John Summerfield. Reproduction prohibited.
