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diff --git a/doc/dev/messenger.rst b/doc/dev/messenger.rst new file mode 100644 index 000000000..729538913 --- /dev/null +++ b/doc/dev/messenger.rst @@ -0,0 +1,33 @@ +============================ + Messenger notes +============================ + +Messenger is the Ceph network layer implementation. Currently Ceph supports +one messenger type: "async". + +ceph_perf_msgr +============== + +ceph_perf_msgr is used to do benchmark for messenger module only and can help +to find the bottleneck or time consuming within messenger moduleIt just like +"iperf", we need to start server-side program firstly: + +# ./ceph_perf_msgr_server 172.16.30.181:10001 1 0 + +The first argument is ip:port pair which is telling the destination address the +client need to specified. The second argument configures the server threads. The +third argument tells the "think time"(us) when dispatching messages. After Giant, +CEPH_OSD_OP message which is the actual client read/write io request is fast +dispatched without queueing to Dispatcher, in order to achieve better performance. +So CEPH_OSD_OP message will be processed inline, "think time" is used by mock +this "inline process" process. + +# ./ceph_perf_msgr_client 172.16.30.181:10001 1 32 10000 10 4096 + +The first argument is specified the server ip:port, and the second argument is +used to specify client threads. The third argument specify the concurrency(the +max inflight messages for each client thread), the fourth argument specify the +io numbers will be issued to server per client thread. The fifth argument is +used to indicate the "think time" for client thread when receiving messages, +this is also used to mock the client fast dispatch process. The last argument +specify the message data length to issue. |