ceph mds memory usage 20GB : is it normal ?

[Alexandre DERUMIER <aderumier@xxxxxxxxx>]

Hi,

I'm running cephfs since 2 months now,

and my active msd memory usage is around 20G now (still growing).

ceph     1521539 10.8 31.2 20929836 20534868 ?   Ssl  janv.26 8573:34 /usr/bin/ceph-mds -f --cluster ceph --id 2 --setuser ceph --setgroup ceph
USER         PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND


this is on luminous 12.2.2

only tuning done is:

mds_cache_memory_limit = 5368709120


(5GB). I known it's a soft limit, but 20G seem quite huge vs 5GB ....


Is it normal ?




# ceph daemon mds.2 perf dump mds
{
    "mds": {
        "request": 1444009197,
        "reply": 1443999870,
        "reply_latency": {
            "avgcount": 1443999870,
            "sum": 1657849.656122933,
            "avgtime": 0.001148095
        },
        "forward": 0,
        "dir_fetch": 51740910,
        "dir_commit": 9069568,
        "dir_split": 64367,
        "dir_merge": 58016,
        "inode_max": 2147483647,
        "inodes": 2042975,
        "inodes_top": 152783,
        "inodes_bottom": 138781,
        "inodes_pin_tail": 1751411,
        "inodes_pinned": 1824714,
        "inodes_expired": 7258145573,
        "inodes_with_caps": 1812018,
        "caps": 2538233,
        "subtrees": 2,
        "traverse": 1591668547,
        "traverse_hit": 1259482170,
        "traverse_forward": 0,
        "traverse_discover": 0,
        "traverse_dir_fetch": 30827836,
        "traverse_remote_ino": 7510,
        "traverse_lock": 86236,
        "load_cent": 144401980319,
        "q": 49,
        "exported": 0,
        "exported_inodes": 0,
        "imported": 0,
        "imported_inodes": 0
    }
}
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