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: [email protected]
To: mabi <[email protected]>, Gluster Users <[email protected]>
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: [email protected]
To: Gluster Users
[<[email protected]>](mailto:[email protected])
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.
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