Is there any way to find out why a ceph-osd process takes around 10
times more load on rand 4k writes than on 4k reads?
Stefan
Am 07.11.2012 21:41, schrieb Stefan Priebe:
Hello list,
whiling benchmarking i was wondering, why the ceph-osd load is so
extreme high while having random 4k write i/o.
Here an example while benchmarking:
random 4k write: 16.000 iop/s 180% CPU Load in top from EACH ceph-osd
process
random 4k read: 16.000 iop/s 19% CPU Load in top from EACH ceph-osd process
seq 4M write: 800MB/s 14% CPU Load in top from EACH ceph-osd process
seq 4M read: 1600MB/s 9% CPU Load in top from EACH ceph-osd process
I can't understand why in this single case the load is so EXTREMELY high.
Greets
Stefan
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