>>Hrm, look at your journal_queue_max_ops, journal_queue_max_bytes,
>>op_queue_max_ops, and op_queue_max_bytes. Looks like you are set at 500
>>ops and a maximum of 100MB. With 1GigE you'd be able to max out the
>>data in the journal really fast. Try tweaking these up and see what
>>happens.
test was made with 15 osd, each osd with 1GB journal.
(so 1Gits = 100MB/S *3 with replication = 300MB /15 osd = 20MB/S (that around
what I see with iostat)
with 1GB journal , it should handle around 50s.
I have redone a test, with 1 osd on 3 nodes with 8GB journal (write around
60-80MB/S on each osd)
journal_queue_max_bytes show again 100MB
journal_queue_max_ops = 500
but
journal_ops = 6500
journal_queue_ops = 0
journal_queue_bytes = 0
(I have done perfcounters_dump each second and
journal_queue_ops,journal_queue_bytes are always 0)
op_queue_max_bytes:100MB
op_queue_max_ops:500
(what are op_ counters ? osd counter ?)
Should'nt be queues values as low as possible ? (0 queue = 0 bottleneck) ?
root@cephtest1:/var/run/ceph# ceph --admin-daemon ceph-osd.0.asok
perfcounters_dump
{"filestore":{"journal_queue_max_ops":500,"journal_queue_ops":0,"journal_ops":6554,"journal_queue_max_bytes":104857600,"journal_queue_bytes":0,"journal_bytes":6624795873,"journal_latency":{"avgcount":6554,"sum":11.5094},"op_queue_max_ops":500,"op_queue_ops":0,"ops":6554,"op_queue_max_bytes":104857600,"op_queue_bytes":0,"bytes":6624755213,"apply_latency":{"avgcount":6554,"sum":4462.6},"committing":0,"commitcycle":143,"commitcycle_interval":{"avgcount":143,"sum":736.741},"commitcycle_latency":{"avgcount":143,"sum":17.2976},"journal_full":0},"osd":{"opq":0,"op_wip":1,"op":838,"op_in_bytes":3514930636,"op_out_bytes":0,"op_latency":{"avgcount":838,"sum":201.494},"op_r":0,"op_r_out_bytes":0,"op_r_latency":{"avgcount":0,"sum":0},"op_w":838,"op_w_in_bytes":3514930636,"op_w_rlat":{"avgcount":838,"sum":0},"op_w_latency":{"avgcount":838,"sum":201.494},"op_rw":0,"op_rw_in_bytes":0,"op_rw_out_bytes":0,"op_rw_rlat":{"avgcount":0,"sum":0},"op_rw_latency":{"avgcount":0,"sum":0},"subop":739,"subop_in_bytes":3099988795,"subop_latency":{"avgcount":739,"sum":45.7711},"subop_w":0,"subop_w_in_bytes":3099988795,"subop_w_latency":{"avgcount":739,"sum":45.7711},"subop_pull":0,"subop_pull_latency":{"avgcount":0,"sum":0},"subop_push":0,"subop_push_in_bytes":0,"subop_push_latency":{"avgcount":0,"sum":0},"pull":0,"push":0,"push_out_bytes":0,"recovery_ops":0,"loadavg":0.56,"buffer_bytes":0,"numpg":1387,"numpg_primary":701,"numpg_replica":686,"numpg_stray":0,"heartbeat_to_peers":2,"heartbeat_from_peers":0,"map_messages":18,"map_message_epochs":37,"map_message_epoch_dups":31},"throttle-filestore_bytes":{"val":0,"max":104857600,"get":0,"get_sum":0,"get_or_fail_fail":0,"get_or_fail_success":0,"take":6554,"take_sum":6624795873,"put":6078,"put_sum":6624795873,"wait":{"avgcount":0,"sum":0}},"throttle-filestore_ops":{"val":0,"max":500,"get":0,"get_sum":0,"get_or_fail_fail":0,"get_or_fail_success":0,"take":6554,"take_sum":6554,"put":6078,"put_sum":6554,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-client":{"val":0,"max":104857600,"get":1076,"get_sum":3523503185,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":1076,"put_sum":3523503185,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-cluster":{"val":0,"max":104857600,"get":5006,"get_sum":3103900299,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":5006,"put_sum":3103900299,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-hbclient":{"val":0,"max":104857600,"get":478,"get_sum":22466,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":478,"put_sum":22466,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-hbserver":{"val":0,"max":104857600,"get":484,"get_sum":22748,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":484,"put_sum":22748,"wait":{"avgcount":0,"sum":0}},"throttle-osd_client_bytes":{"val":0,"max":524288000,"get":840,"get_sum":3523353965,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":1679,"put_sum":3523353965,"wait":{"avgcount":0,"sum":0}}}
----- Mail original -----
De: "Mark Nelson" <[email protected]>
À: "Alexandre DERUMIER" <[email protected]>
Cc: [email protected]
Envoyé: Lundi 18 Juin 2012 17:16:17
Objet: Re: iostat show constants write to osd disk with writeahead journal,
normal behaviour ?
On 6/18/12 9:47 AM, Alexandre DERUMIER wrote:
>>> Yeah, I just wanted to make sure that the constant writes weren't
>>> because the filestore was falling behind. You may want to take a look
>>> at some of the information that is provided by the admin socket for the
>>> OSD while the test is running. dump_ops_in_flight, perf schema, and perf
>>> dump are all useful.
>
>
> don't know which values to check in these big json reponses ;)
> But I have try with more osd, so write are splitted on more disks and and
> write are smaller, and the behaviour is same
No worries, there is a lot of data there!
>
>
> root@cephtest1:/var/run/ceph# ceph --admin-daemon ceph-osd.0.asok
> dump_ops_in_flight
> { "num_ops": 1,
> "ops": [
> { "description": "osd_op(client.4179.0:83 kvmtest1_1006560_object82 [write
> 0~4194304] 3.9f5c55af)",
> "received_at": "2012-06-18 16:41:17.995167",
> "age": "0.406678",
> "flag_point": "waiting for sub ops",
> "client_info": { "client": "client.4179",
> "tid": 83}}]}
>
>
> root@cephtest1:/var/run/ceph# ceph --admin-daemon ceph-osd.0.asok
> perfcounters_dump
>
> {"filestore":{"journal_queue_max_ops":500,"journal_queue_ops":0,"journal_ops":2198,"journal_queue_max_bytes":104857600,"journal_queue_bytes":0,"journal_bytes":1012769525,"journal_latency":{"avgcount":2198,"sum":3.13569},"op_queue_max_ops":500,"op_queue_ops":0,"ops":2198,"op_queue_max_bytes":104857600,"op_queue_bytes":0,"bytes":1012757330,"apply_latency":{"avgcount":2198,"sum":290.27},"committing":0,"commitcycle":59,"commitcycle_interval":{"avgcount":59,"sum":300.04},"commitcycle_latency":{"avgcount":59,"sum":4.76299},"journal_full":0},"osd":{"opq":0,"op_wip":0,"op":127,"op_in_bytes":532692449,"op_out_bytes":0,"op_latency":{"avgcount":127,"sum":49.2627},"op_r":0,"op_r_out_bytes":0,"op_r_latency":{"avgcount":0,"sum":0},"op_w":127,"op_w_in_bytes":532692449,"op_w_rlat":{"avgcount":127,"sum":0},"op_w_latency":{"avgcount":127,"sum":49.2627},"op_rw":0,"op_rw_in_bytes":0,"op_rw_out_bytes":0,"op_rw_rlat":{"avgcount":0,"sum":0},"op_rw_latency":{"avgcount":0,"sum":0},"subop":114,"subo
>
p_in_byte
s":478212311,"subop_latency":{"avgcount":114,"sum":8.82174},"subop_w":0,"subop_w_in_bytes":478212311,"subop_w_latency":{"avgcount":114,"sum":8.82174},"subop_pull":0,"subop_pull_latency":{"avgcount":0,"sum":0},"subop_push":0,"subop_push_in_bytes":0,"subop_push_latency":{"avgcount":0,"sum":0},"pull":0,"push":0,"push_out_bytes":0,"recovery_ops":0,"loadavg":0.47,"buffer_bytes":0,"numpg":423,"numpg_primary":259,"numpg_replica":164,"numpg_stray":0,"heartbeat_to_peers":10,"heartbeat_from_peers":0,"map_messages":34,"map_message_epochs":44,"map_message_epoch_dups":24},"throttle-filestore_bytes":{"val":0,"max":104857600,"get":0,"get_sum":0,"get_or_fail_fail":0,"get_or_fail_success":0,"take":2198,"take_sum":1012769525,"put":1503,"put_sum":1012769525,"wait":{"avgcount":0,"sum":0}},"throttle-filestore_ops":{"val":0,"max":500,"get":0,"get_sum":0,"get_or_fail_fail":0,"get_or_fail_success":0,"take":2198,"take_sum":2198,"put":1503,"put_sum":2198,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_d
ispatch_t
hrottler-client":{"val":4194469,"max":104857600,"get":243,"get_sum":536987810,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":242,"put_sum":532793341,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-cluster":{"val":0,"max":104857600,"get":1480,"get_sum":482051948,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":1480,"put_sum":482051948,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-hbclient":{"val":0,"max":104857600,"get":1077,"get_sum":50619,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":1077,"put_sum":50619,"wait":{"avgcount":0,"sum":0}},"throttle-msgr_dispatch_throttler-hbserver":{"val":0,"max":104857600,"get":972,"get_sum":45684,"get_or_fail_fail":0,"get_or_fail_success":0,"take":0,"take_sum":0,"put":972,"put_sum":45684,"wait":{"avgcount":0,"sum":0}},"throttle-osd_client_bytes":{"val":4194469,"max":524288000,"get":128,"get_sum":536892019,"get_or_fail_fail":0,"get_o
r_fail_su
ccess":0,"take":0,"take_sum":0,"put":254,"put_sum":532697550,"wait":{"avgcount":0,"sum":0}}}
>
>
> root@cephtest1:/var/run/ceph# ceph --admin-daemon ceph-osd.0.asok
> perfcounters_schema
>
> {"filestore":{"journal_queue_max_ops":{"type":2},"journal_queue_ops":{"type":2},"journal_ops":{"type":10},"journal_queue_max_bytes":{"type":2},"journal_queue_bytes":{"type":2},"journal_bytes":{"type":10},"journal_latency":{"type":5},"op_queue_max_ops":{"type":2},"op_queue_ops":{"type":2},"ops":{"type":10},"op_queue_max_bytes":{"type":2},"op_queue_bytes":{"type":2},"bytes":{"type":10},"apply_latency":{"type":5},"committing":{"type":2},"commitcycle":{"type":10},"commitcycle_interval":{"type":5},"commitcycle_latency":{"type":5},"journal_full":{"type":10}},"osd":{"opq":{"type":2},"op_wip":{"type":2},"op":{"type":10},"op_in_bytes":{"type":10},"op_out_bytes":{"type":10},"op_latency":{"type":5},"op_r":{"type":10},"op_r_out_bytes":{"type":10},"op_r_latency":{"type":5},"op_w":{"type":10},"op_w_in_bytes":{"type":10},"op_w_rlat":{"type":5},"op_w_latency":{"type":5},"op_rw":{"type":10},"op_rw_in_bytes":{"type":10},"op_rw_out_bytes":{"type":10},"op_rw_rlat":{"type":5},"op_rw_latency":{"
>
type":5},
"subop":{"type":10},"subop_in_bytes":{"type":10},"subop_latency":{"type":5},"subop_w":{"type":10},"subop_w_in_bytes":{"type":10},"subop_w_latency":{"type":5},"subop_pull":{"type":10},"subop_pull_latency":{"type":5},"subop_push":{"type":10},"subop_push_in_bytes":{"type":10},"subop_push_latency":{"type":5},"pull":{"type":10},"push":{"type":10},"push_out_bytes":{"type":10},"recovery_ops":{"type":10},"loadavg":{"type":1},"buffer_bytes":{"type":2},"numpg":{"type":2},"numpg_primary":{"type":2},"numpg_replica":{"type":2},"numpg_stray":{"type":2},"heartbeat_to_peers":{"type":2},"heartbeat_from_peers":{"type":2},"map_messages":{"type":10},"map_message_epochs":{"type":10},"map_message_epoch_dups":{"type":10}},"throttle-filestore_bytes":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-f
ilestore_
ops":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-msgr_dispatch_throttler-client":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-msgr_dispatch_throttler-cluster":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-msgr_dispatch_throttler-hbclient":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_succes
s":{"type
":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-msgr_dispatch_throttler-hbserver":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}},"throttle-osd_client_bytes":{"val":{"type":10},"max":{"type":10},"get":{"type":10},"get_sum":{"type":10},"get_or_fail_fail":{"type":10},"get_or_fail_success":{"type":10},"take":{"type":10},"take_sum":{"type":10},"put":{"type":10},"put_sum":{"type":10},"wait":{"type":5}}}
>
Hrm, look at your journal_queue_max_ops, journal_queue_max_bytes,
op_queue_max_ops, and op_queue_max_bytes. Looks like you are set at 500
ops and a maximum of 100MB. With 1GigE you'd be able to max out the
data in the journal really fast. Try tweaking these up and see what
happens.
>
>
>
>>> Nuts. Do you still see the little peaks/valleys every couple seconds?
> I see some little peak/valleys, but iostat is not precise enough if think,
> I'll try to do some seekwatcher movie.
>
>
> Do you have a seekwatcher movie of a normal write behaviour ?
> Do I need to see small peak period (when journal is flushed to osd) and long
> valley period ?
>
I think "normal" is not yet well defined. ;) There's so many variables
that can affect performance that it's hard to get a good bead on what
people should expect to see. Having said that, I've got some data I'm
going to post to the mailing list later today that you can look at in
comparison.
Mark
--
--
Alexandre D erumier
Ingénieur Système
Fixe : 03 20 68 88 90
Fax : 03 20 68 90 81
45 Bvd du Général Leclerc 59100 Roubaix - France
12 rue Marivaux 75002 Paris - France
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