Results from Artem's benchmark

Vader on arc00 with windows size = 256 and message size = 64 bytes. Each thread will post 256 requests ping-ping pong-pong with thread id as tag for 100 iterations. The result is obtained by @davideberius 's version of PAPI integrated in OMPI.

2 Threads

Communicator	Message rate	Unexpected	OOS
Same	700437.32	39	321
Separated	821592.27	13	48

4 Threads

Communicator	Message rate	Unexpected	OOS
Same	627965.81	329	8173
Separated	1087428.83	529	130

8 Threads

Communicator	Message rate	Unexpected	OOS
Same	260344.8	1377	301402
Separated	1060360	1314	267