Please do volume profile also for around 10 minutes when CPU% is high.
On Fri, Aug 17, 2018 at 11:56 AM Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx> wrote:
As per the output, all io-threads are using a lot of CPU. It is better to check what the volume profile is to see what is leading to so much work for io-threads. Please follow the documentation at https://gluster.readthedocs.io/en/latest/Administrator%20Guide/Monitoring%20Workload/ section: "Running GlusterFS Volume Profile Command"
and attach output of "gluster volume profile info",On Fri, Aug 17, 2018 at 11:24 AM Hu Bert <revirii@xxxxxxxxxxxxxx> wrote:Good morning,
i ran the command during 100% CPU usage and attached the file.
Hopefully it helps.
2018-08-17 7:33 GMT+02:00 Pranith Kumar Karampuri <pkarampu@xxxxxxxxxx>:
> Could you do the following on one of the nodes where you are observing high
> CPU usage and attach that file to this thread? We can find what
> threads/processes are leading to high usage. Do this for say 10 minutes when
> you see the ~100% CPU.
>
> top -bHd 5 > /tmp/top.${HOSTNAME}.txt
>
> On Wed, Aug 15, 2018 at 2:37 PM Hu Bert <revirii@xxxxxxxxxxxxxx> wrote:
>>
>> Hello again :-)
>>
>> The self heal must have finished as there are no log entries in
>> glustershd.log files anymore. According to munin disk latency (average
>> io wait) has gone down to 100 ms, and disk utilization has gone down
>> to ~60% - both on all servers and hard disks.
>>
>> But now system load on 2 servers (which were in the good state)
>> fluctuates between 60 and 100; the server with the formerly failed
>> disk has a load of 20-30.I've uploaded some munin graphics of the cpu
>> usage:
>>
>> https://abload.de/img/gluster11_cpu31d3a.png
>> https://abload.de/img/gluster12_cpu8sem7.png
>> https://abload.de/img/gluster13_cpud7eni.png
>>
>> This can't be normal. 2 of the servers under heavy load and one not
>> that much. Does anyone have an explanation of this strange behaviour?
>>
>>
>> Thx :-)
>>
>> 2018-08-14 9:37 GMT+02:00 Hu Bert <revirii@xxxxxxxxxxxxxx>:
>> > Hi there,
>> >
>> > well, it seems the heal has finally finished. Couldn't see/find any
>> > related log message; is there such a message in a specific log file?
>> >
>> > But i see the same behaviour when the last heal finished: all CPU
>> > cores are consumed by brick processes; not only by the formerly failed
>> > bricksdd1, but by all 4 brick processes (and their threads). Load goes
>> > up to > 100 on the 2 servers with the not-failed brick, and
>> > glustershd.log gets filled with a lot of entries. Load on the server
>> > with the then failed brick not that high, but still ~60.
>> >
>> > Is this behaviour normal? Is there some post-heal after a heal has
>> > finished?
>> >
>> > thx in advance :-)
>
>
>
> --
> Pranith
--Pranith
--
Pranith
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