[Gluster-users] Test results and Performance Tuning efforts ...

[Paul Cuzner]

Hi,

*IF* your seeing crashes in glusterd, Atin sent out an workaround that
needs to be applied to 3.7.x to avoid the issue (introduced with epoll)

add
# for epoll issue glusterd crash fix
    option ping-timeout 0
    option event-threads  1

to your glusterd.vol files (/etc/glusterfs/glusterd.vol)




On Tue, Oct 13, 2015 at 2:09 PM, Lindsay Mathieson <
lindsay.mathieson at gmail.com> wrote:

>
> On 13 October 2015 at 07:54, Ben Turner <bturner at redhat.com> wrote:
>
>> Random IO has vastly improved with MT epoll introduced in 3.7, try a
>> test on 3.7 with server and client event threads set to 4.  If you want to
>> confirm this before you upgrade run top -H during your testing and look for
>> a hot thread(single thread / CPU pegged at 100%).  If you see this during
>> your runs on 3.6 then the MT epoll implementation in 3.7 will def help
>> you out.
>>
>
>
> Not 100%, but it gets up to 90%
>
> Oddly, the feature list seems to show it as being done in 3.6 (
> http://www.gluster.org/community/documentation/index.php/Features/Feature_Smallfile_Perf#multi-thread-epoll
> )
>
> Seems to be causing 3.7.4 to crash regularly at the moment to :(
>
>
> --
> Lindsay
>
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