On 2/9/2016 10:11 AM, Lionel Bouton wrote:
Actually if I understand correctly how PG splitting works the next spike should be <n> times smaller and spread over <n> times the period (where <n> is the number of subdirectories created during each split which seems to be 15 according to OSDs' directory layout).
I would expect that splitting one directory would take the same amount of time as it did this time, it's just that now there will be N times as many directories to split because of the previous splits. So the duration of the spike would be quite a bit longer.
That said, the problem that could happen is that by the time you reach the next split you might have reached <n> times the object creation speed you have currently and get the very same spike.
This test runs as fast as possible, so in the best case scenario, object creation speed would stay the same, but is likely to gradually slow over time.
Kris Jurka _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
