> -----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 My natural inclination is to use RAM first and swap last, perhaps based on outdated notions.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. Ray ---------------------------------------------------------------------- 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/
