[pve-devel] [PATCH manager v3 1/2] api: ceph: add applications of each pool to the lspools endpoint

[Thomas Lamprecht]

Am 21/10/2022 um 08:57 schrieb Stefan Sterz:
>> out of interest: how expensive is this, did you check the overhead?
>>
> do you want a specific metric? in my (admittedly small) test setup
> (three vm cluster with 4 cores and 4Gib RAM) it is barely noticeable.
> the api call takes between 18 and 25ms in both cases for me.
> 

I mean, with a handful of pools you probably won't (or really should not)
see any difference >50 ms, that would make it a hard case arguing.

Just wondered if many pools (e.g., [10, 100, 1000]) actually increase this
O(n) or if that falls in the noise of the rados monitor query overhead.

I don't expect that is significant, just wondered if you already checked
and got some info on that.