Re: [OMPI users] some mpi processes "disappear" on a cluster of servers

Hi Andrea I would guess this is a memory problem. Do you know how much memory each node has? Do you know the memory that each MPI process in the CFD code requires? If the program starts swapping/paging into disk, because of low memory, those interesting things that you described can happen. I

[OMPI users] some mpi processes "disappear" on a cluster of servers

Hi, I have been in trouble for a year. I run a pure MPI (no openMP) Fortran fluid dynamical code on a cluster of server, and I obtain a strange behaviour by running the code on multiple nodes. The cluster is formed by 16 pc (1 pc is a node) with a dual core processor. Basically, I'm able to run

Re: [OMPI users] MPI::Intracomm::Spawn and cluster configuration

Thanks, much appreciated. On Fri, Aug 31, 2012 at 2:37 PM, Ralph Castain wrote: > I see - well, I hope to work on it this weekend and may get it fixed. If I > do, I can provide you with a patch for the 1.6 series that you can use until > the actual release is issued, if that

Re: [OMPI users] MPI::Intracomm::Spawn and cluster configuration

I see - well, I hope to work on it this weekend and may get it fixed. If I do, I can provide you with a patch for the 1.6 series that you can use until the actual release is issued, if that helps. On Aug 31, 2012, at 2:33 PM, Brian Budge wrote: > Hi Ralph - > > This

Re: [OMPI users] MPI::Intracomm::Spawn and cluster configuration

Hi Ralph - This is true, but we may not know until well into the process whether we need MPI at all. We have an SMP/NUMA mode that is designed to run faster on a single machine. We also may build our application on machines where there is no MPI, and we simply don't build the code that runs the

[OMPI users] [SPAM:### 83%] Re:

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Re: [OMPI users] Accessing data member of MPI_File struct

On Aug 30, 2012, at 11:35 PM, Ammar Ahmad Awan wrote: > My real problem is that I want to access the fields from the MPI_File > structure other than the ones provided by the API e.g. the fd_sys. > > Atomicity was just one example I used to explain my problem. If MPI_File is > an opaque

[OMPI users] Infiniband performance Problem and stalling

(reposted with consolidated information) I have a test rig comprising 2 i7 systems 8GB RAM with Melanox III HCA 10G cards running Centos 5.7 Kernel 2.6.18-274 Open MPI 1.4.3 MLNX_OFED_LINUX-1.5.3-1.0.0.2 (OFED-1.5.3-1.0.0.2): On a Cisco 24 pt switch   Normal performance is: $ mpirun --mca btl

Re: [OMPI users] Accessing data member of MPI_File struct

Thanks for your answer. Yes, I mistakenly printed the return value of the function rather than atomicity. My real problem is that I want to access the fields from the MPI_File structure other than the ones provided by the API e.g. the fd_sys. Atomicity was just one example I used to explain my