Re: [OMPI users] RE : MPI hangs on multiple nodes

[Eugene Loh]

Should be fine.  Once MPI_Send returns, it should be safe to reuse the 
buffer.  In fact, the return of the call is the only way you have of 
checking that the message has left the user's send buffer.  The case 
you're worried about is probably MPI_Isend, where you have to check 
completion with an MPI_Test* or MPI_Wait* call.

On 9/19/2011 6:26 AM, Sébastien Boisvert wrote:
Hello,
Is it safe to re-use the same buffer (variable A) for MPI_Send and MPI_Recv 
given that MPI_Send may be eager depending on
the MCA parameters ?