I forgot to add 'slabtop' is a nice tool for watching this stuff.
Scott On 8/23/2013 9:36 AM, Scott Nolin wrote:
You might also try increasing the vfs_cache_pressure. This will reclaim inode and dentry caches faster. Maybe that's the problem, not page caches. To be clear - I have no deep insight into Lustre's use of the client cache, but you said you has lots of small files, which if lustre uses the cache system like other filesystems means it may be inodes/dentries. Filling up the page cache with files like you did in your other tests wouldn't have the same effect. Just my guess here. We had some experience years ago with the opposite sort of problem. We have a big ftp server, and we want to *keep* inode/dentry data in the linux cache, as there are often stupid numbers of files in directories. Files were always flowing through the server, so the page cache would force out the inode cache. Was surprised to find with linux there's no ability to set a fixed inode cache size - the best you can do is "suggest" with the cache pressure tunable. Scott On 8/23/2013 6:29 AM, Dragseth Roy Einar wrote:I tried to change swapiness from 0 to 95 but it did not have any impact on the system overhead. r.
smime.p7s
Description: S/MIME Cryptographic Signature
_______________________________________________ Lustre-discuss mailing list Lustre-discuss@lists.lustre.org http://lists.lustre.org/mailman/listinfo/lustre-discuss
