On 15 August 2013 16:44, Dean, David (I/S) <david_d...@bcbst.com> wrote:
> Is there any benefit (or negative) to running a "drop_cache" periodically? > > I don't find it helpful in most cases, especially since it does not reduce the server footprint. Shaking up memory like that may even make performance much worse. But I do use it in my 'cmmflush' approach where I have Linux drop the cache and then give back that memory to z/VM. It still has some disadvantages, but the reduction in footprint is very helpful to improve response times. The 'periodically' would be specific moments in your workload rather than every hour (unless maybe on development systems where I do run it from cron). http://zvmperf.wordpress.com/2012/07/06/using-cmm-to-flush-a-linux-guests-memory/ Rob ---------------------------------------------------------------------- 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/
