Since I'm very suspicious about the condition of the IB network on my cluster,
I'm trying to use the csum pml feature of OMPI (1.4.3).

 But I have a question: what happens if the Checksum is different on both ends ?
Is there a warning printed, a flag set by the MPI_(I)recv or equivalent,
and the application aborting ?

 Any help appreciated,    Best,    G.