[Gluster-users] Performance loss from 3.4.2 to 3.6.2

[Pranith Kumar Karampuri]

On 02/12/2015 02:07 PM, ML mail wrote:
> Thanks Pranith for the details. So with that option one would be 
> trading data consistency with performance. I am now interested to hear 
> about Nico's new tests with this option disabled...
>
>
> On Thursday, February 12, 2015 9:23 AM, Pranith Kumar Karampuri 
> <pkarampu at redhat.com> wrote:
>
>
>
> 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.
Just wanted to clarify that by 'filesystem' I mean backend filesystems 
like XFS and EXT4.

Pranith
>
> Pranith
>>
>> Regards
>> ML
>>
>>
>> On Thursday, February 12, 2015 8:24 AM, Pranith Kumar Karampuri 
>> <pkarampu at redhat.com> <mailto: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
>> >
>>
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