Re: [OMPI users] OpenMP + OpenMPI

2007-12-06 Thread Jeff Squyres
On Dec 6, 2007, at 9:54 AM, Durga Choudhury wrote: Automatically striping large messages across multiple NICs is certainly a very nice feature; I was not aware that OpenMPI does this transparently. (I wonder if other MPI implementations do this or not). However, I have the following

Re: [OMPI users] OpenMP + OpenMPI

2007-12-06 Thread Durga Choudhury
Automatically striping large messages across multiple NICs is certainly a very nice feature; I was not aware that OpenMPI does this transparently. (I wonder if other MPI implementations do this or not). However, I have the following concern: Since the communication over an ethernet NIC is most

Re: [OMPI users] OpenMP + OpenMPI

2007-12-06 Thread Jeff Squyres
Wow, that's quite a .sig. :-) Open MPI will automatically stripe large messages across however many NICs you have. So you shouldn't need to use multiple threads. The threading support in the OMPI v1.2 series is broken; it's not worth using. There's a big warning in configure when you

[OMPI users] OpenMP + OpenMPI

2007-12-05 Thread Tee Wen Kai
Hi everyone, I have installed openmpi-1.2.3. My system has two ethernet ports. Thus, I am trying to make use of both ports to speed up the communication process by using openmp to split into two threads. However, this implementation always cause error. Then I realized that I need to build