Jeff Squyres wrote: > This sounds like memory badness is occurring somewhere in your > application which eventually corrupts things to make them stop working > (e.g., writing beyond the end of arrays, etc.). Have you run your app > through a memory-checking debugger, perchance?
A related question. In this particular code fortran char arrays are sent around as follows; say character*37 A(MAX), B(MAX) on sender call MPI_Send(A, MAX*37, MPI_CHARACTER, dest, tag, MPI_COMM_WORLD ... on dest call MPI_Recv(B, MAX*37, MPI_CHARACTER, sender, tag, MPI_COMM_WORLD ... Up to a certain point in the code if I compile with optimization -O3 it runs without the system calls problems I mentioned. If no optimization is used I run into the system calls problems. Does this mean that the when optimized the A and B are allocated contiguously but not when non-optimized thus a possible reason for memory corruption? I guess another way to ask is: is it guaranteed that A and B are contiguous? and the MPI communication correctly sends the data? Thanks, -- Valmor
