Red Hat Bugzilla – Bug 764368
"profile info" lists 'nan' in latency when heavy i/o is running
Last modified: 2016-05-31 21:55:14 EDT
Created attachment 467
Running profile info lists nan when dbench is running with 150 clients.
I was running dbench with 15 clients for 10 hours and was also running fileop with 35 directory depth. I was taking profile info after every 4000 seconds. After first 4000 seconds i started getting nan in profile results. I have attached profile results file for reference. I have also archived the logs.
This bug can be reproduced even without heavy i/o.
I Created a replicate setup with two bricks. Created 100 files and read from it. Ran profile info and i consistently got nan in latency. I have archived the logs.
PATCH: http://patches.gluster.com/patch/6735 in master (mgmt/glusterd: Fix gluster-profile performance issues)
PATCH: http://patches.gluster.com/patch/6736 in master (debug/io-stats: Fix races and performance issues in profile)
Its fixed now. profile info does not say nan now.