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!
[email protected]:
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To:[email protected]
From: Masha Atakova<[email protected]>
Subject: subscribe ceph-devel
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