|
Hi Yang,
Thank you for your reply. This is very useful indeed that there
are many ImageCtx objects for one image.
But in my setting, I don't have any particular ceph client
connected to ceph (I could, but this is not the point). I'm trying
to get metrics for particular image while not performing anything
with it myself.
And I'm trying to get access to performance counters listed in
the ImageCtx class, they don't seem to be reported by the perf
tool.
Thanks!
On 27/03/17 12:29, Dongsheng Yang
wrote:
Hi Masha
you can get the counters by perf dump command on the asok file
of your client. such as that:
$ ceph --admin-daemon out/client.admin.9921.asok perf dump|grep rd
"rd": 656754,
"rd_bytes": 656754,
"rd_latency": {
"discard": 0,
"discard_bytes": 0,
"discard_latency": {
"omap_rd": 0,
But, note that, this is a counter of this one ImageCtx, but not
the counter for this image. There are
possible several ImageCtxes reading or writing on the same image.
Yang
On 03/27/2017 12:23 PM, Masha Atakova
wrote:
Hi everyone,
I was going around trying to figure out how to get ceph
metrics on a more detailed level than daemons. Of course, I
found and explored API for watching rados objects, but I'm
more interested in getting metrics about RBD images. And while
I could get list of objects for particular image, and then
watch all of them, it doesn't seem like very efficient way to
go about it.
I checked librbd API and there isn't anything helping with my
goal.
So I went through the source code and found list of
performance counters for image which are incremented by other
parts of ceph when making corresponding operations: https://github.com/ceph/ceph/blob/master/src/librbd/ImageCtx.cc#L364
I have 2 questions about it:
1) is there any workaround to use those counters right now?
maybe when compiling against ceph the code doing it. Looks
like I need to be able to access particular ImageCtx object
(instead of creating my own), and I just can't find
appropriate class / part of the librbd allowing me to do so.
2) are there any plans on making those counters accessible
via API like librbd or librados?
I see that these questions might be more appropriate for the
devel list, but:
- it seems to me that question of getting ceph metrics is
more interesting for those who use ceph
- I couldn't subscribe to it with an error provided below.
Thanks!
majordomo@xxxxxxxxxxxxxxx:
SMTP error from remote server for MAIL FROM command, host: vger.kernel.org (209.132.180.67) reason: 553 5.7.1 Hello [74.208.4.201], for your MAIL FROM address <masha.atakova@xxxxxxxx> policy analysis reported: Your address is not liked source for email
--- The header of the original message is following. ---
Received: from [192.168.1.10] ([223.206.146.181]) by mail.gmx.com (mrgmxus001
[74.208.5.15]) with ESMTPSA (Nemesis) id 0M92q3-1d0LS03yov-00CTwW for
<majordomo@xxxxxxxxxxxxxxx>; Mon, 27 Mar 2017 05:55:46 +0200
To: majordomo@xxxxxxxxxxxxxxx
From: Masha Atakova <masha.atakova@xxxxxxxx>
Subject: subscribe ceph-devel
Message-ID: <174d9bc0-b50d-fc80-ede8-5ba9d472e56a@xxxxxxxx>
Date: Mon, 27 Mar 2017 10:55:43 +0700
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
Thunderbird/45.7.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 7bit
X-Provags-ID: V03:K0:Lau7llt7/MuJt+nRLjXIhY91IuCvCBJGtqDzxLgqkh2ERVkWeep
5CDyh9GHW7QSodn80xWCPOOD2kvvnr6YxrB5R9SZ1iloI9VO2YoTXAauDq4mtWh+abwUOiY
wQgj6YvUcLjfUinsh0t68Q9m3h3ufZIoKIeWhKFGbsRALqsvZjgWBVlaAR/V5Vt4O/wFJGG
YULQ6/t4oDSsBuy4agFdQ==
X-UI-Out-Filterresults: notjunk:1;V01:K0:xLdjozptxu8=:nO7vxZvAbidrXk7gcv7Wqc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_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
|
_______________________________________________
ceph-users mailing list
ceph-users@xxxxxxxxxxxxxx
http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
