Hello all, I just uploaded a new version to the ticket. This version includes all fixes I received from Jeff and Fab. Thank you very much for the reviews! Based on Rolf's comment, I added a longer description that clearly defines the order of elements in the send/recv buffers. https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/258 Please review! Thanks & All the Best, Torsten -- bash$ :(){ :|:&};: --------------------- http://www.unixer.de/ ----- Torsten Hoefler | Performance Modeling and Simulation Lead Blue Waters Directorate | University of Illinois (UIUC) 1205 W Clark Street | Urbana, IL, 61801 NCSA Building | +01 (217) 244-7736