On Tue, Feb 07, 2012 at 08:18:24AM -0600, Greg Swift wrote: > concurrency will be affected by your underlying filesystem as well. > which filesystem you got? XFS. But as I said, I am comparing direct-to-filesystem versus via-gluster-to-same-filesystem. I have been digging through source code. If I am reading it right, it seems that xlators/performance/io-threads only sets the number of threads to be log(base2) of the number of outstanding I/O entries in the queue. That is, to get 8 concurrent threads you need 256 outstanding requests in the queue. This doesn't seem right to me. The default limit is 16 threads, but you'd need 64K+ outstanding queued operations to ever hit that. I will try playing with the code a bit. Regards, Brian.
