[Beowulf] MPI_Isend/Irecv failure for IB and large message sizes

Hi, I am running into problems when sending large messages (about 18000 doubles) over IB. A fairly trivial example program is attached. # mpicc -g sendrecv.c # mpiexec -machinefile m2 -n 2 ./a.out id=1: calling irecv ... id=0: calling isend ... [[60322,1],1][btl_openib_component.c:2951:handle

[Beowulf] Array Declaration approach difference

Hi All. I have parallel PDE/CFD code in fortran. Let we consider it consisting of two parts: 1) Startup part; that includes input reads, splits, distributions, forming neighborhood information arrays, grid arrays, and all related. It includes most of the necessary array declarations. 2) Iterati