Re: [OMPI users] RDMA GPUDirect CUDA...

2012-08-14 Thread Rolf vandeVaart
To answer the original questions, Open MPI will look at taking advantage of the RDMA CUDA when it is available. Obviously, work needs to be done to figure out the best way to integrate into the library. Much like there are a variety of protocols under the hood to support host transfer of data

Re: [OMPI users] RDMA GPUDirect CUDA...

2012-08-14 Thread Durga Choudhury
Dear OpenMPI developers I'd like to add my 2 cents that this would be a very desirable feature enhancement for me as well (and perhaps others). Best regards Durga On Tue, Aug 14, 2012 at 4:29 PM, Zbigniew Koza wrote: > Hi, > > I've just found this information on nVidia's plans regarding enha

[OMPI users] RDMA GPUDirect CUDA...

2012-08-14 Thread Zbigniew Koza
Hi, I've just found this information on nVidia's plans regarding enhanced support for MPI in their CUDA toolkit: http://developer.nvidia.com/cuda/nvidia-gpudirect The idea that two GPUs can talk to each other via network cards without CPU as a middleman looks very promising. This technology

Re: [OMPI users] Regarding hyperthreding

2012-08-14 Thread seshendra seshu
Hi I was about tell that i have written an MPI code in which i have specified only for the communication between nodes and i dont whether can i run program as per my requirement i.e to use the cores present in my node (all 4 cores). So my doubt is should i need to include pthreads or the program w

Re: [OMPI users] Regarding hyperthreding

2012-08-14 Thread Jeff Squyres
On Aug 14, 2012, at 7:55 AM, seshendra seshu wrote: > I haven't still changed my code to run when threading is needed (presently > working). I'm afraid I can't parse that sentence; I don't know what you mean. > I have doubt that when i calculate the MPI ranks using the MPI command it > give

Re: [OMPI users] Regarding hyperthreding

2012-08-14 Thread seshendra seshu
Hi Tom, Thank you. I haven't still changed my code to run when threading is needed (presently working). I have doubt that when i calculate the MPI ranks using the MPI command it gives only the nodes which have given in a host file. But how can i calculate the MPI ranks as you have told i.e N=H(