I tried set client cache size = 100, but it doesn't solve the problem. I tested ceph-fuse with kernel version 3.13.0-24 3.13.0-49 and 3.16.0-34.
On Tue, Apr 28, 2015 at 7:39 PM John Spray <john.sp...@redhat.com> wrote: > > > On 28/04/2015 06:55, Dexter Xiong wrote: > > Hi, > > I've deployed a small hammer cluster 0.94.1. And I mount it via > > ceph-fuse on Ubuntu 14.04. After several hours I found that the > > ceph-fuse process crashed. The end is the crash log from > > /var/log/ceph/ceph-client.admin.log. The memory cost of ceph-fuse > > process was huge(more than 4GB) when it crashed. > > Then I did some test and found these actions will increase memory > > cost of ceph-fuse rapidly and the memory cost never seem to decrease: > > > > * rsync command to sync small files(rsync -a /mnt/some_small /srv/ceph) > > * chown command/ chmod command(chmod 775 /srv/ceph -R) > > > > But chown/chmod command on accessed files will not increase the memory > > cost. > > It seems that ceph-fuse caches the file nodes but never releases them. > > I don't know if there is an option to control the cache size. I > > set mds cache size = 2147483647 option to improve the performance of > > mds, and I tried to set mds cache size = 1000 at client side but it > > doesn't effect the result. > > The setting for client-side cache limit is "client cache size", default > is 16384 > > What kernel version are you using on the client? There have been some > issues with cache trimming vs. fuse in recent kernels, but we thought we > had workarounds in place... > > Cheers, > John > >
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