Hi Greg, On Tue, Jul 7, 2015 at 4:25 PM, Gregory Farnum <greg@xxxxxxxxxxx> wrote: >> 4. "mds cache size = 5000000" is going to use a lot of memory! We have >> an MDS with just 8GB of RAM and it goes OOM after delegating around 1 >> million caps. (this is with mds cache size = 100000, btw) > > Hmm. We do have some data for each client with a cap, but I think it's > pretty small in comparison to the size of each inode in memory. The > number of caps shouldn't impact memory usage very much, although the > number of inodes in cache definitely will. Do I understand this right that having client caps exceeding the limit is merely an annoyance and shouldn't explode mds memory usage? (I say annoyance because I find it difficult to run an MDS without the HEALTH_WARN that clients aren't responding to cache pressure). IOW, do you expect that the size of the mds inode LRU will stay under the mds_cache_size even if a client doesn't respond release caps ?? check_memory_usage prints num_inodes_with_caps and inode_map.size() Is there a way to see the current LRU size on a running MDS? Cheers, Dan _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
 |