Re: [OMPI users] Raspberry Pi 2 Beowulf Cluster for OpenFOAM

Hi Gilles, Yes that’s correct – one node with 3 cores is about 1.5 minutes for a 10 second simulation, this turns into 4 minutes when I send the job to 36 cores on 9 IP connected nodes. I haven’t setup an x86 cluster to do a comparison, I know this would be a lot easier than setting up the

Re: [OMPI users] how to benchmark a server with openmpi?

*All* codes scale differently. So you should do these tests with your own code, and not a different code (such as MM). 2016-01-24 15:38 GMT+01:00 Ibrahim Ikhlawi : > > > Hallo, > > I am working on a server and run java codes with OpenMPI. I want to know > which number

[OMPI users] how to benchmark a server with openmpi?

Hallo, I am working on a server and run java codes with OpenMPI. I want to know which number of process is the fastest to run my code with? For this reason I wrote a code that multiply two matrices but the differences between the results is not significant. Therefore I want to know how can

Re: [OMPI users] Raspberry Pi 2 Beowulf Cluster for OpenFOAM

Steve, if I understand correctly, running on one node with 4 MPI tasks is three times faster than running on 10 nodes with 40 (10 ?) tasks. did you try this test on a x86 cluster and with tcp interconnect, and did you get better performance when increasing the number of nodes ? can you try to

Re: [OMPI users] Raspberry Pi 2 Beowulf Cluster for OpenFOAM

Hi Steve. Regarding Step 3, have you thought of using some shared storage? NFS shared drive perhaps, or there are many alternatives! On 23 January 2016 at 20:47, Steve O'Hara wrote: > Hi, > > > > I’m afraid I’m pretty new to both OpenFOAM and openMPI so please