Having taken a lot more data it does seem the glusterfsd and
glusterd processes (along with several ksoftirqd) spike up to near 100% on both
client and brick servers during any file transport across the mount. Thankfully
this is short-lived for the most part but I’m wondering if this is expected
behavior or what others have experienced(?) I’m a little surprised such a large
CPU load would be required to move small files and / or use an application
within a Gluster mount point.
I wanted to test this against an NFS mount of the same Gluster
volume. I managed to get rstatd installed and running but my attempts to mount
the volume via NFS are met with:
mount.nfs: requested NFS version or transport protocol is not
supported
Relevant line in /etc/fstab:
node1:/volume /volume nfs
defaults,_netdev,vers=3,mountproto=tcp 0 0
It looks like CentOS 6.x has NFS version 4 built into everything. So a few
questions:
- Has anyone else noted significant performance differences between a
glusterfs mount and NFS mount for volumes of 8+ bricks?
- Is there a straightforward way to make the newer versions of CentOS
play nice with NFS version 3 + Gluster?
- Are there any general performance tuning guidelines I can follow to
improve CPU performance? I found a few references to the cache settings but
nothing solid.
If the consensus is that NFS will not gain anything then I won’t waste the time
setting it all up.
Thanks,
~Mike C.
From: [email protected]
[mailto:[email protected]] On Behalf Of Michael Colonno
Sent: Friday, February 01, 2013 4:46 PM
To: [email protected]
Subject: Re: [Gluster-users] high CPU load on all bricks
Update: after a few hours the CPU usage seems to have dropped down
to a small value. I did not change anything with respect to the configuration
or unmount / stop anything as I wanted to see if this would persist for a long
period of time. Both the client and the self-mounted bricks are now showing CPU
< 1% (as reported by top). Prior to the larger CPU loads I installed a bunch of
software into the volume (~ 5 GB total). Is this kind a transient behavior – by
which I mean larger CPU loads after a lot of filesystem activity in short time
– typical? This is not a problem in my deployment; I just want to know what to
expect in the future and to complete this thread for future users. If this is
expected behavior we can wrap up this thread. If not then I’ll do more digging
into the logs on the client and brick sides.
Thanks,
~Mike C.
From: Joe Julian [mailto:[email protected]]
Sent: Friday, February 01, 2013 2:08 PM
To: Michael Colonno; [email protected]
Subject: Re: [Gluster-users] high CPU load on all bricks
Check the client log(s).
Michael Colonno <[email protected]> wrote:
Forgot to mention: on a client system (not a brick) the glusterfs
process is consuming ~ 68% CPU continuously. This is a much less powerful
desktop system so the CPU load can’t be compared 1:1 with the systems
comprising the bricks but still very high. So the issue seems to exist with
both glusterfsd and glusterfs processes.
Thanks,
~Mike C.
From: [email protected]
[mailto:[email protected]] On Behalf Of Michael Colonno
Sent: Friday, February 01, 2013 12:46 PM
To: [email protected]
Subject: [Gluster-users] high CPU load on all bricks
Gluster gurus ~
I’ve deployed and 8-brick (2x replicate) Gluster 3.3.1 volume on
CentOS 6.3 with tcp transport. I was able to build, start, mount, and use the
volume. On each system contributing a brick, however, my CPU usage (glusterfsd)
is hovering around 20% (virtually zero memory usage thankfully). These are
brand new, fairly beefy servers so 20% CPU load is quite a bit. The deployment
is pretty plain with each brick mounting the volume to itself via a glusterfs
mount. I assume this type of CPU usage is atypically high; is there anything I
can do to investigate what’s soaking up CPU and minimize it? Total usable
volume size is only about 22 TB (about 45 TB total with 2x replicate).
Thanks,
~Mike C.
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