[Wien] MPI parallel execution take much time than nonparallel on the same case on the multiprosesor single machine

-Post: wien@zeus.theochem.tuwien.ac.at Date: Thu, 26 Apr 2012 11:22:27 -0500 Subject: Re: [Wien] MPI parallel execution take much time than nonparallel on the same case on the multiprosesor single machine How many cores do you have, and what version of mpi are you using? Running mpi with only 3

[Wien] MPI parallel execution take much time than nonparallel on the same case on the multiprosesor single machine

dear all recently I switch to MPI parallel execution.I compile the scalapack.2.0.1 and GotoBLAS2 and recompiled wien2k sources.bellow you will see the compiler option which I set for compiling the wien2k. Current settings: O Compiler options:-ffree-form -O2 -ffree-line-length-none L

[Wien] MPI parallel execution take much time than nonparallel on the same case on the multiprosesor single machine

How many cores do you have, and what version of mpi are you using? Running mpi with only 3 processes on one machine is almost certainly not going to be efficient and for that just stay with non-mpi. With a dual quadcore (8 cores) or more it can be, provided that the mpi version you use optimizes we