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<DIV><FONT face=Arial size=2>The attached program ran literally thousands of
times on our old cluster, which has MPICH1 libraries, without any
problems.</FONT></DIV>
<DIV><FONT face=Arial size=2>It is simple in terms of MPI (just the minimum MPI
setup + a few Send and Recv commands), although it is fairly long because it
implements a complicated model of cardiac tissue.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>On our new cluster (with MPICH2) the program
crashes with segmentation faults either on the first MPI_Send/Recv or at the end
(MPI_Finalize). If you run it several times in a row, it seems to be
random which of the two occurs. I have checked carefully that the space
for the passed data has been allocated.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>I would greatly appreciate if someone with more MPI
experience could have a look at the source code and give me his/her
opinion.</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Best,</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Christian</FONT></DIV></BODY></HTML>