[ceph-admin@mds0 ~]$ ps aux | grep ceph-mds
ceph 1841 3.5 94.3 133703308 124425384 ? Ssl Apr04 1808:32
/usr/bin/ceph-mds -f --cluster ceph --id mds0 --setuser ceph --setgroup ceph
[ceph-admin@mds0 ~]$ sudo ceph daemon mds.mds0 cache status
{
"pool": {
"items": 173261056,
"bytes": 76504108600
}
}
So, 80GB is my configured limit for the cache and it appears the mds is
following that limit. But, the mds process is using over 100GB RAM in my
128GB host. I thought I was playing it safe by configuring at 80. What
other things consume a lot of RAM for this process?
Let me know if I need to create a new thread.
On Thu, May 10, 2018 at 12:40 PM, Patrick Donnelly <[email protected]>
wrote:
> Hello Brady,
>
> On Thu, May 10, 2018 at 7:35 AM, Brady Deetz <[email protected]> wrote:
> > I am now seeing the exact same issues you are reporting. A heap release
> did
> > nothing for me.
>
> I'm not sure it's the same issue...
>
> > [root@mds0 ~]# ceph daemon mds.mds0 config get mds_cache_memory_limit
> > {
> > "mds_cache_memory_limit": "80530636800"
> > }
>
> 80G right? What was the memory use from `ps aux | grep ceph-mds`?
>
> > [root@mds0 ~]# ceph daemon mds.mds0 perf dump
> > {
> > ...
> > "inode_max": 2147483647,
> > "inodes": 35853368,
> > "inodes_top": 23669670,
> > "inodes_bottom": 12165298,
> > "inodes_pin_tail": 18400,
> > "inodes_pinned": 2039553,
> > "inodes_expired": 142389542,
> > "inodes_with_caps": 831824,
> > "caps": 881384,
>
> Your cap count is 2% of the inodes in cache; the inodes pinned 5% of
> the total. Your cache should be getting trimmed assuming the cache
> size (as measured by the MDS, there are fixes in 12.2.5 which improve
> its precision) is larger than your configured limit.
>
> If the cache size is larger than the limit (use `cache status` admin
> socket command) then we'd be interested in seeing a few seconds of the
> MDS debug log with higher debugging set (`config set debug_mds 20`).
>
> --
> Patrick Donnelly
>
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