[Gluster-users] Old story - glusterfs memory usage

Amon Ott ao at m-privacy.de
Fri Mar 26 12:16:53 UTC 2010

On Friday 26 March 2010 wrote Krzysztof Strasburger:
> On Fri, Mar 26, 2010 at 12:08:48PM +0100, Amon Ott wrote:
> > I can confirm this problem on our test system. glusterfs goes up to the
> > memory limit set for performance/io-cache (1.2 GB here), logs out of
> > memory errors and further access fails with "Stale NFS file handle". The
> > above command did not help, only remounting did.
> >
> > So I assume some memory leak in the io-cache filter.
> No, this should happen without any filters. What happens, if you disable
> io-cache?

Disabled both io-cache and read-ahead. Now it only grew to 739 MB. Again, 
drop_caches did not reduce that size, although it reduced the fuse_inode 
slabs significantly. No out of memory now.

My test is a backup run of some linux kernel source trees, so many small files 
and dirs. Data is on four servers, distributed over two mirrors of two nodes 
each. We would like to use glusterfs for distributed storage in a cluster of 
application servers - but this bug is a show stopper, because it leads to 
denial of service.

Please note that I can live with 1GB of memory for the glusterfs process, if 
it needs that. It must not block accesses, this is my concern.

Amon Ott
Dr. Amon Ott - m-privacy GmbH
Am Köllnischen Park 1, 10179 Berlin
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