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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