Re: [OMPI users] Making MPI_Send to behave as blocking for all the sizes of the messages

2010-11-18 Thread Eugene Loh
Try lowering the eager threshold more gradually... e.g., 4K, 2K, 1K, 512, etc. -- and watch what happens. I think you will see what you expect, except once you get too small then the value is ignored entirely. So, the setting just won't work at the extreme value (0) you want. Maybe the

[OMPI users] Making MPI_Send to behave as blocking for all the sizes of the messages

2010-11-18 Thread George Markomanolis
Dear all, I am trying to disable the eager mode in OpenMPI 1.3.3 and I don't see a real difference between the timings. I would like to execute a ping (rank 0 sends a message to rank 1) and to measure the duration of the MPI_Send on rank 0 and the duration of MPI_Recv on rank 1. I have the