Hi Sam/Sage, As we discussed earlier, enabling the present OpTracker code degrading performance severely. For example, in my setup a single OSD node with 10 clients is reaching ~103K read iops with io served from memory while optracking is disabled but enabling optracker it is reduced to ~39K iops. Probably, running OSD without enabling OpTracker is not an option for many of Ceph users. Now, by sharding the Optracker:: ops_in_flight_lock (thus xlist ops_in_flight) and removing some other bottlenecks I am able to match the performance of OpTracking enabled OSD with OpTracking disabled, but with the expense of ~1 extra cpu core. In this process I have also fixed the following tracker.
http://tracker.ceph.com/issues/9384 and probably http://tracker.ceph.com/issues/8885 too. I have created following pull request for the same. Please review it. https://github.com/ceph/ceph/pull/2440 Thanks & Regards Somnath ________________________________ PLEASE NOTE: The information contained in this electronic mail message is intended only for the use of the designated recipient(s) named above. If the reader of this message is not the intended recipient, you are hereby notified that you have received this message in error and that any review, dissemination, distribution, or copying of this message is strictly prohibited. If you have received this communication in error, please notify the sender by telephone or e-mail (as shown above) immediately and destroy any and all copies of this message in your possession (whether hard copies or electronically stored copies).
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