[OMPI users] Process 0 with different time executing the same code

Hi all, I am a research assistant (RA) at NUST Pakistan in High Performance Scientific Computing Lab. I am working on the parallel implementation of the Finitie Difference Time Domain (FDTD) method using MPI. I am using the OpenMPI environment on a cluster of 4 SunFire v890 cluster connected

Re: [OMPI users] Process 0 with different time executing the same code

Thanks for your reply, I used MPI_Wtime for my application but even then process 0 took longer time executing the mentioned code segment. I might be worng, but what I see is process 0 takes more time to access the array elements than other processes. Now I dont see what to do because the mentione

Re: [OMPI users] Process 0 with different time executing the same code

Thanks, The array bounds are the same on all the nodes and also the compute nodes are identical i.e. SunFire V890 nodes. And I have also changed the root process to be on different nodes, but the problem remains the same. I still dont understand the problem very well and my progress is in stand s

Re: [OMPI users] Process 0 with different time executing the same code

Hi All, Thanks for the help. I think that I don't have the cache issue because all the processes have the same amount of data, and accessed in the same fashion. My problem is solved partially as I was using 2, 4, 8 , 16, 32 and 64 processes for my application code. Now what I did I used 3 pr