On Wed, 13 Jan 2016, Zhang Huan wrote: > Hello Sage, > > I have been watching the development of bluestore for a while. I am > interested in bluestore because I believe putting object store on top of > raw device is the right way. I would like to know if you have any > release schedule, and which version it will be merged into? I also > notice that there is big locks (Collection->lock and > StupidAllocator->lock, etc) in the write path, this might be an issue > for SSD. Do you have any plan to break it into finer locks? It's in master now and it will be part of the jewel release. It won't be the default choice yet, since it is still very new and unproven, but so far performance is looking better than FileStore on HDDs. The collection->lock doesn't need to be broken up since it's hidden beneath the OSD's per-pg lock anyway. The allocator lock could be sharded, though, by creating multiple allocation groups (ala XFS). This is partly why the Allocator interface is abstract and the current implementation is called StupidAllocator :). If you can demonstrate that the lock is affecting performance we should definitely improve that! sage -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
