+ gluster-devel On Wed, May 17, 2017 at 10:50 PM, mabi <m...@protonmail.ch> wrote:
> I don't know exactly what kind of context-switches it was but what I know > is that it is the "cs" number under "system" when you run vmstat. > > Also I use the percona linux monitoring template for cacti ( > https://www.percona.com/doc/percona-monitoring-plugins/ > LATEST/cacti/linux-templates.html) which monitors context switches too. > If that's of any use interrupts where also quite high during that time with > peaks up to 50k interrupts. > > > > -------- Original Message -------- > Subject: Re: [Gluster-users] 120k context switches on GlsuterFS nodes > Local Time: May 17, 2017 2:37 AM > UTC Time: May 17, 2017 12:37 AM > From: ravishan...@redhat.com > To: mabi <m...@protonmail.ch>, Gluster Users <gluster-us...@gluster.org> > > > On 05/16/2017 11:13 PM, mabi wrote: > > Today I even saw up to 400k context switches for around 30 minutes on my > two nodes replica... Does anyone else have so high context switches on > their GlusterFS nodes? > > I am wondering what is "normal" and if I should be worried... > > > > > -------- Original Message -------- > Subject: 120k context switches on GlsuterFS nodes > Local Time: May 11, 2017 9:18 PM > UTC Time: May 11, 2017 7:18 PM > From: m...@protonmail.ch > To: Gluster Users <gluster-us...@gluster.org> <gluster-us...@gluster.org> > > Hi, > > Today I noticed that for around 50 minutes my two GlusterFS 3.8.11 nodes > had a very high amount of context switches, around 120k. Usually the > average is more around 1k-2k. So I checked what was happening and there > where just more users accessing (downloading) their files at the same time. > These are directories with typical cloud files, which means files of any > sizes ranging from a few kB to MB and a lot of course. > > Now I never saw such a high number in context switches in my entire life > so I wanted to ask if this is normal or to be expected? I do not find any > signs of errors or warnings in any log files. > > > What context switch are you referring to (syscalls context-switch on the > bricks?) ? How did you measure this? > -Ravi > > My volume is a replicated volume on two nodes with ZFS as filesystem > behind and the volume is mounted using FUSE on the client (the cloud > server). On that cloud server the glusterfs process was using quite a lot > of system CPU but that server (VM) only has 2 vCPUs so maybe I should > increase the number of vCPUs... > > Any ideas or recommendations? > > > > Regards, > M. > > > > > _______________________________________________ > Gluster-users mailing > listGluster-users@gluster.orghttp://lists.gluster.org/mailman/listinfo/gluster-users > > > > > _______________________________________________ > Gluster-users mailing list > gluster-us...@gluster.org > http://lists.gluster.org/mailman/listinfo/gluster-users > -- Pranith
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