[Gluster-users] Performance loss from 3.4.2 to 3.6.2

[Pranith Kumar Karampuri]

On 02/12/2015 01:17 PM, ML mail wrote:
> Dear Pranith
>
> I would be interested to know what the cluster.ensure-durability off 
> option does, could you explain or point to the documentation?
By default replication translator does fsyncs on the files at certain 
times so that it doesn't lose data when the filesystem crashes and 
changelogs that afr stores are corrupted. This is introduced from 3.5.x 
on wards.

Pranith
>
> Regards
> ML
>
>
> On Thursday, February 12, 2015 8:24 AM, Pranith Kumar Karampuri 
> <pkarampu at redhat.com> wrote:
>
>
>
> On 02/12/2015 04:37 AM, Nico Schottelius wrote:
> > Hello,
> >
> > switching from 3.4.2 to 3.6.2 reduces our average test performance 
> dramatically.
> >
> > Our test setup: directly connected 1 GBit/s hosts setup with:
> >
> >      rm -rf /home/gluster/.glusterfs/
> >      rm /home/gluster/*
> >      setfattr -x trusted.glusterfs.volume-id /home/gluster/
> >      setfattr -x trusted.gfid /home/gluster/
> >      gluster volume create xfs-plain replica 2 transport tcp 
> vmhost1-cluster1:/home/gluster vmhost2-cluster1:/home/gluster
> >      gluster volume start xfs-plain
> >
> > Afterwards we run our near real world test
> >
> >      mount -t glusterfs vmhost1-cluster1:/xfs-plain /mnt/gluster/
> >      while true; do dd if=redmine-from-ceph-20150204 
> of=/mnt/gluster/testvm bs=1M; rm /mnt/gluster/testvm; done
> >
> > The results are
> >
> >      3.4.2: ~71-72 MiB/s    [ubuntu 14.04]
> >      3.6.2: ~59-64 MiB/s    [gluster-3.6 ppa]
> >
> > We have removed 3.6.2 and re-installed 3.4.2 and can consistently 
> reproduce
> > these numbers over hours of testing.
> Could you repeat the test on 3.6.2 with 'volume set <volname>
> cluster.ensure-durability off' option and post the results.
>
> Pranith
>
> >
> > Is there any configuration change that we need to incorporate to run
> > 3.6.2 faster or is this a known problem?
> >
> > Cheers,
> >
> > Nico
> >
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org <mailto:Gluster-users at gluster.org>
> http://www.gluster.org/mailman/listinfo/gluster-users
>
>
>
>
> _______________________________________________
> Gluster-users mailing list
> Gluster-users at gluster.org
> http://www.gluster.org/mailman/listinfo/gluster-users

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.gluster.org/pipermail/gluster-users/attachments/20150212/aa5e3925/attachment.html>