Rob, Heap size is set to 500M/1000M. I've read recommendations to make default/max the same number, but I would just be guessing at a value. It has grow close to 800M at least once, but it always falls back to around the default size and stays there most of the time. Ray
> -----Original Message----- > From: Linux on 390 Port [mailto:[email protected]] On > Behalf Of Rob van der Heij > Sent: Wednesday, June 23, 2010 11:06 AM > To: [email protected] > Subject: Re: Memory use question > > On Wed, Jun 23, 2010 at 4:46 PM, Mrohs, Ray > <[email protected]> wrote: > > > The cache number looks interesting because it remains large > while swap space is being used up. This particular > > instance has been up for 30+ days, so maybe there is > incremental swap space saturation over time? > > Swappiness setting makes Linux swap out process data to retain data in > page cache. It's likely to happen when the JVM heap is too large and > continues to grow. The old stuff never gets referenced and is > eventually swapped out, and then later z/VM will page out that VDISK > again. Still find, until the point where you do a garbage collect and > re-use the heap pages. That requires Linux to swap it in, which means > z/VM must page it in.. etc. > > Rob > -- > Rob van der Heij > Velocity Software > http://www.velocitysoftware.com/ > > ---------------------------------------------------------------------- > 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 > ---------------------------------------------------------------------- > For more information on Linux on System z, visit > http://wiki.linuxvm.org/ > ---------------------------------------------------------------------- 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 ---------------------------------------------------------------------- For more information on Linux on System z, visit http://wiki.linuxvm.org/
