[SCore-users] rpmtest with pingpong test

[kameyama at pccluster.org]

In article <3F008082.6090500 at cse.psu.edu> Gyu Sang Choi <gchoi at cse.psu.edu> wrotes:
> When the messages size is small, rpmtest works.
> However, if the message size is getting big, rpmtest doesn't work?


rpmtest (without -vwrite option) call pmGetSendBuffer() for sending the message.
(http://www.pccluster.org/score/dist/score/html/en/man/man3/pmGetSendBuffer.html)

And pmGetSendBuffer() must specify langth from 1 to MTU.
MTU is PM deice dependent, You can get MTU by pmGetMtu().
In myrinet2k device (and myrinet), the MTU value is 8256.
So you must specify message size less than 8256.

                       from Kameyama Toyohisa