On 04/07/2015 02:16 PM, Mark Nelson wrote:
On 04/07/2015 09:57 AM, Mark Nelson wrote:
Hi Guys,
I ran some quick tests on Sage's newstore branch. So far given that
this is a prototype, things are looking pretty good imho. The 4MB
object rados bench read/write and small read performance looks
especially good. Keep in mind that this is not using the SSD journals
in any way, so 640MB/s sequential writes is actually really good
compared to filestore without SSD journals.
small write performance appears to be fairly bad, especially in the RBD
case where it's small writes to larger objects. I'm going to sit down
and see if I can figure out what's going on. It's bad enough that I
suspect there's just something odd going on.
Mark
Seekwatcher/blktrace graphs of a 4 OSD cluster using newstore for those
interested:
http://nhm.ceph.com/newstore/
Interestingly small object write/read performance with 4 OSDs was about
1/3-1/4 the speed of the same cluster with 36 OSDs.
Note: Thanks Dan for fixing the directory column width!
Mark
New fio/librbd results using Sage's latest code that attempts to keep
small overwrite extents in the db. This is 4 OSD so not directly
comparable to the 36 OSD tests above, but does include seekwatcher
graphs. Results in MB/s:
write read randw randr
4MB 57.9 319.6 55.2 285.9
128KB 2.5 230.6 2.4 125.4
4KB 0.46 55.65 1.11 3.56
Seekwatcher graphs:
http://nhm.ceph.com/newstore/20150407/
Mark
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