Erasure Coding CPU Overhead Data

[Mark Nelson <mnelson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>]

[-- Attachment #1: Type: text/plain, Size: 930 bytes --]

Hi All,

Last spring at the tail end of Firefly development we ran tests looking 
at erasure coding performance both during simple RADOS read/write tests 
and also during an OSD recovery event.  Recently we were asked if we had 
any data on CPU usage overhead with erasure coding.  We had collected 
CPU utilization statistics when we ran our tests, so we went back and 
plotted the CPU utilization results and wrote up a short document based 
on those plots.  This data is fairly old at this point so it's probably 
not going to be relevant for Hammer and may not be relevant for more 
recent releases of Firefly.

This system had 30 OSDs configured and 12 2.0GHz XEON cores which is 
likely slightly underpowered for EC.  Interestingly CPU usage for small 
object writes was not significantly higher than with replication though 
overall performance was quite a bit lower.  Let me know if you have any 
questions!

Thanks,
Mark

[-- Attachment #2: Ceph_Firefly_EC_CPU_Usage.pdf --]
[-- Type: application/pdf, Size: 244469 bytes --]

[-- Attachment #3: Type: text/plain, Size: 178 bytes --]

_______________________________________________
ceph-users mailing list
ceph-users-idqoXFIVOFJgJs9I8MT0rw@public.gmane.org
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com