Re: [pve-devel] [PATCH manager] ceph osd: ui: show PGs per OSD

[Aaron Lauterer <a.lauterer@proxmox.com>]

On 2/15/23 07:18, Thomas Lamprecht wrote:
> Am 14/02/2023 um 17:14 schrieb Aaron Lauterer:
>> Seems like the `osd df tree` call is about 25% slower, plus minus.
>>
>> Tested on our AMD test cluster that is currently set up with 3 nodes with 4 OSDs each. 50k iterations.
>>
>> root@jura1:~# ./bench.pl
>>                 Rate osd-df-tree    osd-tree
>> osd-df-tree  9217/s          --        -27%
>> osd-tree    12658/s         37%          --
>> root@jura1:~# ./bench.pl
>>                 Rate osd-df-tree    osd-tree
>> osd-df-tree  9141/s          --        -25%
>> osd-tree    12136/s         33%          --
>> root@jura1:~# ./bench.pl
>>                 Rate osd-df-tree    osd-tree
>> osd-df-tree  9940/s          --        -23%
>> osd-tree    12987/s         31%          --
>> root@jura1:~# ./bench.pl
>>                 Rate osd-df-tree    osd-tree
>> osd-df-tree  8666/s          --        -20%
>> osd-tree    10846/s         25%          --
>> root@jura1:~#
> 
> Many thanks for the insight, so significantly more than noise but far from problematic.

Yep, and we don't call it all the time, AFAIU when opening the OSD panel and on 
manual "Reload"s.

I took another look at the Ceph API but couldn't find a call that might give us 
that information as well to check if it would be cheaper to call.