On 09/06/2016 10:16 PM, Dan Jakubiec wrote:
Hello, I need to issue the following commands on millions of objects:rados_write_full(oid1, ...) rados_setxattr(oid1, "attr1", ...) rados_setxattr(oid1, "attr2", ...) Would it make it any faster if I combined all 3 of these into a single rados_write_op and issued them "together" as a single call? My current application doesn't really care much about the atomicity, but maximizing our write throughput is quite important. Does rados_write_op save any roundtrips to the OSD or have any other efficiency gains?
Yes, individual calls will send one message per call, adding more round trips and overhead, whereas bundling changes in a rados_write_op will only send one message. You can see this in the number of MOSDOp messages shown with 'debug ms = 1' on the client. Josh _______________________________________________ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
