[Gluster-users] Understanding gluster performance
g.danti at assyoma.it
Tue Jan 21 09:55:31 UTC 2020
Il 20-01-2020 16:30 Gionatan Danti ha scritto:
> So, I have some questions:
> - why performance are so low with fsync?
> - why do I have so low IOPs (20/30) for minutes?
> - what is capping the non-fsync test?
> - why both glusterd and glusterfd are so CPU intensive? I can
> understand glusterfd itself requiring more CPU, but glusterd should
> only manage the other processes and send the volume information to
> asking client, right?
An update: the very low IOPs were caused by TCP retransmission on one of
the two boxes. After that problem was fixed, no such low performance was
I also think that the non-fsync tests, with about 5000 IOPs, are cappaed
by the 1000BaseT round trip time.
Some questions remain:
- why performance are so low with fsync? (about 250 IOPs)
- why both glusterd and glusterfd are so CPU intensive?
Assyoma S.r.l. - www.assyoma.it
email: g.danti at assyoma.it - info at assyoma.it
GPG public key ID: FF5F32A8
More information about the Gluster-users