[Gluster-users] high CPU load on all bricks

[Michael Colonno]

            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:joe at julianfamily.org] 
Sent: Friday, February 01, 2013 2:08 PM
To: Michael Colonno; gluster-users at gluster.org
Subject: Re: [Gluster-users] high CPU load on all bricks

 

Check the client log(s). 

Michael Colonno <mcolonno at stanford.edu> 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: gluster-users-bounces at gluster.org [mailto:gluster-users-bounces at gluster.org] On Behalf Of Michael Colonno
Sent: Friday, February 01, 2013 12:46 PM
To: gluster-users at gluster.org
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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