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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