Quoting John Spray ([email protected]):
> On Mon, Jan 8, 2018 at 8:02 PM, Marc Roos <[email protected]> wrote:
> >
> > I guess the mds cache holds files, attributes etc but how many files
> > will the default "mds_cache_memory_limit": "1073741824" hold?
>
> We always used to get asked how much memory a given mds_cache_size (in
> inodes) would require, I guess it was only a matter of time until the
> reverse question was asked :-)
@Marc Roos:
{"items":731544591,"bytes":144955142984}
Bytes used is actually: 235604586496 (RES), 248868077568 (VIRT).
So:
1073741824/235604586496
.00455738931049302623
.*731544591
3333933.49917239288177762193
./(1000^2)
3.33393349917239288177
~ around 3 Milion "items" for 1 GiB
More details below.
ceph daemon mds.mds2 perf dump | jq
},
"mds_mem": {
"ino": 45358896,
"ino+": 268519704,
"ino-": 223160808,
"dir": 31856591,
"dir+": 199761898,
"dir-": 167905307,
"dn": 45358896,
"dn+": 281905135,
"dn-": 236546239,
"cap": 3000076,
"cap+": 300470635,
"cap-": 297470559,
"rss": 230082340,
"heap": 313884,
"buf": 0
},
ceph daemon mds.mds2 dump_mempools | jq
},
"mds_co": {
"items": 731544591,
"bytes": 144955142984
},
...
...
},
"total": {
"items": 1482069569,
"bytes": 145738337213
}
Gr. Stefan
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