Also, I don't think I'd set the heap higher. If you don't need it, that's just wasted memory. And garbage collection will run longer when it does run.
Marcy "This message may contain confidential and/or privileged information. If you are not the addressee or authorized to receive this for the addressee, you must not use, copy, disclose, or take any action based on this message or any information herein. If you have received this message in error, please advise the sender immediately by reply e-mail and delete this message. Thank you for your cooperation." -----Original Message----- From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On Behalf Of Mrohs, Ray Sent: Thursday, June 24, 2010 5:53 AM To: LINUX-390@vm.marist.edu Subject: Re: [LINUX-390] Memory use question > -----Original Message----- > From: Linux on 390 Port [mailto:linux-...@vm.marist.edu] On > Behalf Of Marcy Cortes > Sent: Wednesday, June 23, 2010 3:45 PM > To: LINUX-390@VM.MARIST.EDU > Subject: Re: Memory use question > > Rob mentioned the vm.swappiness setting and he and I have had > a lot of discussions about that one. You do want to probably > set that to zero on a WAS server (and probably others). It's > recommended in this WAS tuning paper too > http://download.boulder.ibm.com/ibmdl/pub/software/dw/linux390 > /perf/ZSW03132USEN.PDF I have trouble seeing whether using memory or v-disk in memory is more effective, though I might have read that VM needs to page more for large seldom referenced v-disk spaces. My natural inclination is to use RAM first and swap last, perhaps based on outdated notions. Anyway I set swappiness to zero. The publication also seems to recommend a heap size that is ~70% of available memory. In our case that would equal 1400M which is 400M more than our current max. setting. ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu 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/
