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Hi Yang,
> 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.
Yes, I did mean to get counters via API. And looks like I can adapt
this admin-daemon command for my purposes. Thanks!
Having ceph-top would be just great and much more useful for me,
yes. I'm glad there are some discussions about that and I didn't
know about them. So thanks for pointing me out :)
On 27/03/17 15:38, Dongsheng Yang
wrote:
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>
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