Re: [HPDD-discuss] MDS dentry slabinfo
are you running with MDS + client on the same node?
thanks, Alex
On Dec 4, 2013, at 4:25 PM, Daire Byrne <daire(a)dneg.com> wrote:
Hi,
I have been playing around with setting vfs_cache_pressure=0 on our v2.4.1 MDS and
noticed that the dentry usage as reported from slabtop looks very odd. It seems to remain
pretty much the same for long periods of time and then jumps up suddenly. I have attached
a graph of ldiskfs_inode_cache,dentry and buffer_head.
https://db.tt/DSxKl5gm
Is the dentry usage tracked in some other slab? The server ran out of memory not long
after the dentry count jumped up. What I'm interesting in doing is track slab usage
and toggle vfs_cache_pressure to avoid running out of memory whilst maximising the
inode/dentry cache.
Daire<mds-slab.png>_______________________________________________
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