[mvapich-discuss] mpi_ssend and system call (fortran) conflict

[Noam Bernstein]

I've been seeing a problem with mvapich with Intel ifort (10.1.015),  
where a call to system
will cause subsequent calls to mpi_ssend to hang or crash.  Using  
mpi_send seems to be
fine, and removing the call to system also fixes the problem.

This is on a dual Opteron, Infiniband system (Mellanox HCAs), with  
OFED 1.2.5.1.  There
A relaxed error (related to fork) was supposedly fixed in this  
version of  OFED (1.2.1 according
to the release notes http://www.open-mpi.org/svn/new.php).

mvapich-1.0.1 with make.mvapich.gen2 hangs

mvapich2-1.0.3 with make.mvapich2.ofa crashes, with the message:

   send desc error
   [0] Abort: [] Got completion with error 1, vendor code=69, dest  
rank=1
    at line 519 in file ibv_channel_manager.c

(rank 0 is the sender).

I'm starting with this list, since the fact that mpi_ssend has  
problems but
mpi_send does not makes me think that it's either an mvapich problem or
an mvapich specific interaction with OFED.

													thanks,
													Noam

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