Am 29.06.2012 13:37, schrieb Mark Nelson:
On 6/28/12 4:25 PM, Stefan Priebe wrote:
Am 28.06.2012 17:33, schrieb Sage Weil:
Have you tried adjusting 'osd op threads'? The default is 2, but bumping
that to, say, 8, might give you better concurrency and throughput.
For me this doesn't change anything. I believe the ceph-osd processes
are the problem. I mean i've 8 cores x 3,6Ghz and 4 ceph-osd processses
use around 80%.
"Mark Nelson" <mark.nelson@xxxxxxxxxxx> wrote:
It would be interesting to see where all your CPU time is being spent.
What benchmark are you using to do the random writes?
Definitely. Seeing perf/oprofile/whatever results for the osd under that
workload would be very interesting! We need to get perf going in our
testing environment...
I have it working. But even a call graph of 10s is around 120 000 lines
long ?!
Stefan
What tool did you use to do the profiling?
i used the perf tool bundled with the kernel source. I can send you the
perf.data file if you want. But i don't see anything interesting. But
maybe i've just used perf the wrong way.
Stefan
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
