What is the best way to "look at the rgw admin socket " to see what operations are taking a long time ?
Best Regards
Wade
On Mon, Feb 8, 2016 at 12:16 PM Gregory Farnum <gfarnum@xxxxxxxxxx> wrote:
On Mon, Feb 8, 2016 at 8:49 AM, Kris Jurka <jurka@xxxxxxxxxx> wrote:
>
> I've been testing the performance of ceph by storing objects through RGW.
> This is on Debian with Hammer using 40 magnetic OSDs, 5 mons, and 4 RGW
> instances. Initially the storage time was holding reasonably steady, but it
> has started to rise recently as shown in the attached chart.
>
> The test repeatedly saves 100k objects of 55 kB size using multiple threads
> (50) against multiple RGW gateways (4). It uses a sequential identifier as
> the object key and shards the bucket name using id % 100. The buckets have
> index sharding enabled with 64 index shards per bucket.
>
> ceph status doesn't appear to show any issues. Is there something I should
> be looking at here?
>
>
> # ceph status
> cluster 3fc86d01-cf9c-4bed-b130-7a53d7997964
> health HEALTH_OK
> monmap e2: 5 mons at
> {condor=192.168.188.90:6789/0,duck=192.168.188.140:6789/0,eagle=192.168.188.100:6789/0,falcon=192.168.188.110:6789/0,shark=192.168.188.118:6789/0}
> election epoch 18, quorum 0,1,2,3,4
> condor,eagle,falcon,shark,duck
> osdmap e674: 40 osds: 40 up, 40 in
> pgmap v258756: 3128 pgs, 10 pools, 1392 GB data, 27282 kobjects
> 4784 GB used, 69499 GB / 74284 GB avail
> 3128 active+clean
> client io 268 kB/s rd, 1100 kB/s wr, 493 op/s
It's probably a combination of your bucket indices getting larger and
your PGs getting split into subfolders on the OSDs. If you keep
running tests and things get slower it's the first; if they speed
partway back up again it's the latter.
Other things to check:
* you can look at your OSD stores and how the object files are divvied up.
* you can look at the rgw admin socket and/or logs to see what
operations are the ones taking time
* you can check the dump_historic_ops on the OSDs to see if there are
any notably slow ops
-Greg
>
>
> Kris Jurka
>
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>
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