On 03/27/2017 04:06 PM, Masha Atakova wrote:
Hi Yang,
Hi Masha,
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.
The perf counter you mentioned in your first mail, is just for one
particular image client, that means,
these perf counter will disappear as the client disconnected.
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.
Do you mean get the perf counters via api? At first this counter is
only for a particular ImageCtx (connected client), then you can
read the counters by the perf dump command in my last mail I think.
If you want to get the performance counter for an image (no matter
how many ImageCtx, connected or disconnected),
maybe you need to wait this one:
http://pad.ceph.com/p/ceph-top
Yang
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:
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From: Masha Atakova <masha.atakova@xxxxxxxx>
Subject: subscribe ceph-devel
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