Hi All,
I started a small project related to metrics collection and
processing, Ceph was chosen as a storage backend. Decided to use rados
directly, to avoid any additional layers. I got a very simple client -
it works fine, but performance is very low. Can't get more than
30-35MBsec. Rados bench shows 200MBsec for my test pool. Should be
mentioned about the client - I'm using sbcl (yep lisp). Call to rados
API is just cffi call.
Did try in async mode. Wow ! Saturated network bandwidth for large
objects (4Mb and bigger), for small objects - saturated OSD IOPS
~2.4KIOPS for 8 SAS disks, so ~300 IOPS per disk - that sounds pretty
reasonable. Bottom line - issue not with the lisp client - im getting
close to C performance, difference is sync vs async IO.
Why it's so big - sync operations are approx 2-3 times slower then async .
Daniel Mezentsev, founder
(+1) 604 313 8592.
Soleks Data Group.
Shaping the clouds.
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