On Fri, Aug 13, 2004 at 01:46:17AM +0200, Moloko Monyepao wrote: > The lpar is intended to run a java based timesheet application using postgrel as its > database. The following is the output from "FREE" > > >linux141:/ # free > total used free shared buffers cached > Mem: 773612 768736 4876 0 161500 430968 > -/+ buffers/cache: 176268 597344 > Swap: 300072 1508 298564 > linux141:/
Yeesh. Overkill, overkill, overkill. Looks like a 768M partition, and you're using more than 590M for buffers and file cache. Is this app really that much of a hog? The total column shows you how much you have available to be allocated. The used column tells you in total how much you have used for any purpose. used + free should equal total. The shared column is just that; pages shared between processes. The buffers and cached columns tell you how much of the total is allocated to buffers and file cache. used - (buffers + cached) - free tells you how much storage your application is actually using. In this case, your application is using about 176M. The rest of your RAM is being used for dirty file buffers and cached data. This is not a good use of expensive zSeries RAM. > Please help me on how can I interpret this info. Does it mean I > still have a lot of memory left according to "FREE"command It means that more than 2/3 of the resources you've allocated to this LPAR are currently being used for buffers and file cache. You should seriously consider reducing the size of this LPAR unless this app is really clumsy in it's use of memory. 256M would probably be a good size to start with, unless this app sucks up memory when it's running (we can't tell from just the one sample). As load increases on this application, or the data in core for this application increases over time, the number of file cache pages and buffers should decrease in relation to the total application storage, but you're a long way from that point now. I'd say you're pretty overallocated for now. -- db ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
