Parallel computing quad core

Prad

Hi

I am running my CFD code on quad core machine. It terminating with following error: "rank 1 in job 78 host_40793 caused collective abort of all ranks exit status of rank 1: killed by signal 11"

My machine architecture is Processor (CPU): Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz

OS: Linux 2.6.22.19-0.1-default x86_64

System: openSUSE 10.3 (x86_64)

KDE: 3.5.7 "release 72.9"

MPI Library is :mpich

But I have already ran this with IBM-Cluster with AIX operating system with 8 processors. And there is no problem(even with higher number of control volumes)

But when I reduce the no of control volumes. It is working even on quad core.

For example I can run on single processor with 1 million control volumes. But I am not able use more than few thousand(say 40 K) control volumes on four processors, all together. My code is based on block structures(It reads blocks and the divisions on each line). It is written in Fortran 77 and using gcc and gfortran for compiling it.

In short I am able run on four processors of quad core machine with very few number of control volume. But when I increase the number of control volumes, it is collapsing with the above error.

I dont know much about MPI. So, it will be great, if somebody can throw light how to use calculate on quad core machine with higher number of control volumes.

Please let me know, if you need some more information to answer

Regards Prad