Re: [OMPI users] MPI_AllReduce design for shared-memory.

2007-08-14 Thread Jeff Squyres
The primary person you need to talk to is turning in her dissertation within the next few days. So I think she's kinda busy at the moment... :-) Sorry for the delay -- I'll take a shot at answers below... On Aug 14, 2007, at 4:39 PM, smai...@ksu.edu wrote: Can anyone help on this? -Tha

Re: [OMPI users] MPI_AllReduce design for shared-memory.

2007-08-14 Thread smairal
Thanks, I understand what you are saying. But my query is regarding the design of MPI_AllReduce for shared-memory systems. I mean is there any different logic/design of MPI_AllReduce when OpenMPI is used on shared-memory systems? The standard MPI_AllReduce says, 1. Each MPI process sends its value

Re: [OMPI users] MPI_AllReduce design for shared-memory.

2007-08-14 Thread smairal
Can anyone help on this? -Thanks, Sarang. Quoting smai...@ksu.edu: > Hi, > I am doing a research on parallel techniques for shared-memory > systems(NUMA). I understand that OpenMPI is intelligent to utilize > shared-memory system and it uses processor-affinity. Is the OpenMPI > design of MPI_All

[OMPI users] MPI_AllReduce design for shared-memory.

2007-08-10 Thread smairal
Hi, I am doing a research on parallel techniques for shared-memory systems(NUMA). I understand that OpenMPI is intelligent to utilize shared-memory system and it uses processor-affinity. Is the OpenMPI design of MPI_AllReduce "same" for shared-memory (NUMA) as well as distributed system? Can someon