[MPICH] MPI_Send() return condition

[Darius Buntinas]

There's really no way, aside from using ssend or bsend explicitly.  You 
could try using a macro to replace all MPI_Sends with one of the others, 
then recompile your program, if that's what you're trying to do.

Just to be picky, MPI_Send returns when it's safe for the user to access 
the send buffer again.  That happens typically when one of the two 
conditions you mentioned occurs, or if

   3. the message is sent and is received before a matching receive call 
occurs (i.e., as an unexpected message).

-d

On 11/24/2007 02:21 PM, Yipkei Kwok wrote:
> Hi,
> 
> Traditionally, MPI_Send() returns under one of the following conditions.
> 
> 1. a matching receive call occurs
> 2. the message is copied into a system buffer (even if it still has not 
> reached the receiver
> 
> I am running MPICH2 Release 1.0.6 on Linux PPC 64-bits. I know that the 
> choice between the 2 options above is implementation-dependent. How can 
> I force the run-time to pick a specific option without replacing 
> MPI_Send() with MPI_Ssend() or MPI_Bsend()?
> 
> Thank you very much!
> 
> Regards,
> Yipkei
>