On Wed, Apr 29, 2015 at 4:33 PM, Dexter Xiong <dxtxiong@xxxxxxxxx> wrote: > The output of status command of fuse daemon: > "dentry_count": 128966, > "dentry_pinned_count": 128965, > "inode_count": 409696, > I saw the pinned dentry is nearly the same as dentry. > So I enabled debug log(debug client = 20/20) and read Client.cc source > code in general. I found that an entry will not be trimed if it is pinned. > But how can I unpin dentrys? Maybe these dentries are pinned by fuse kernel module (ceph-fuse does not try trimming kernel cache when its cache size > client_cache_size). Could you please run "mount -o remount <mount point>", then run the status command again. check if number of pinned dentries drops. Regards Yan, Zheng > > On Wed, Apr 29, 2015 at 12:19 PM Dexter Xiong <dxtxiong@xxxxxxxxx> wrote: >> >> 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.spray@xxxxxxxxxx> 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 >>> > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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