[Gluster-users] Poor performance on a server-class system vs. desktop

Gionatan Danti g.danti at assyoma.it
Thu Nov 26 17:14:56 UTC 2020

Il 2020-11-26 09:47 Dmitry Antipov ha scritto:
> On 11/26/20 11:29 AM, Gionatan Danti wrote:
>> Can you details your exact client and server CPU model?
> Desktop is 8x of:
> model name	: Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz
> Server is 32x of:
> model name	: Intel(R) Xeon(R) Silver 4110 CPU @ 2.10GHz

Your desktop CPU single-thread performance is significantly higher than 
the server CPU: the former turbo to 3.5 GHz, while the latter only to 
3.0 GHz. Moreover, for single-thread workloads Skylake client is 3-5% 
faster than Skylake server at the same frequency.

So I think you simply are CPU limited. I remember doing some tests with 
loopback RAM disks and finding that Gluster used 100% CPU (ie: full load 
on an entire core) when doing 4K random writes. Side note: using 
synchronized (ie: fsync) 4k writes, I only get ~600 IOPs even when 
running both bricks on the same machine and backing them with RAM disks 
(in other words, with no network or disk bottleneck).


Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. - www.assyoma.it
email: g.danti at assyoma.it - info at assyoma.it
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