OpenMPI version: 1.3.3 Platform: IBM P5
Built OpenMPI 64-bit (i.e., CFLAGS=-q64, CXXFLAGS=-q64, -FFLAGS=-q64, -FCFLAGS=-q64) FORTRAN 90 test program: - Create a large array (3.6 GB of 32-bit INTs) - Initialize MPI - Create a large window to encompass large array (3.6 GB) - Have PE 0 get 1 32-bit INT from PE1 o Lock the window o MPI_GET o Unlock the window - Free the window - Finalize MPI Built FORTRAN 90 test program 64-bit using OpenMPI wrapper compiler (mpif90 -q64). Why would this MPI_GET work fine with displacements all the way up to just under 2 GB, and then fail as soon as the displacement hits 2 GB? The MPI_GET succeeds with a displacement of 2147483644 (4 bytes less than 2 GB). I get a segmentation fault (address not mapped) when the displacement is 2147483648 (2 GB) or larger. Thanks.
