Yeah - we'll probably start small, with say half a GB cache and see if it affects other packages. We use VDISk for paging, and perfmon shows that we have XSTOR, but no usage.
I wonder if it would help to put nginx, Memcache and Redis code into a single VM shared segment. Would it require that the libraries they use have to be there, too, for that to have any effect? We run nginx on several linux VM's, so the idea is that it would be used enough that it wouldn't often be a candidate for paging. Mvh./Best Regards Roger Evans, Autodata Norge A/S http://www.autodata.no +47 93 25 92 36 On Tue, 2012-10-30 at 14:00 +0000, David Boyes wrote: > >But our Z enthusiast > > says we can put Redis and memcache on Z-Linux (under VM) without any > > loss of functionality or performance (because we have extra capacity and > > "paging on Z doesn't cost anything"). > > I'd agree on functionality, but performance is a harder question. Both redis > and memcache build and run fine on Z, no problems there. The trick is that > memory usage in a shared environment is much trickier to calculate the impact > of mass allocations of RAM -- depends a lot on where and how fast you page, > whether you have XSTOR or not, etc, etc, etc,. > > I'd try it with a smaller database and see how it goes. XSTORE will have a > measurable impact, as will use of VDISK for paging. > > ---------------------------------------------------------------------- > 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/
