[Gluster-users] 120k context switches on GlsuterFS nodes

[Ravishankar N]

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: mabi at protonmail.ch
>> To: Gluster Users <gluster-users at 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.
>
>
>
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