Re: [OMPI users] error mesages appeared but program runs successfully?

Hi Daofeng Do you have an Infiniband card in the machine where you are running the program? (Open Fabrics / OFED is the software support for Infiniband. I guess you need the same version installed in all machines.) Does the directory referred in the error message actually exist in your machine

Re: [OMPI users] difference between single and double precision

On 2010-12-03, at 8:46AM, Jeff Squyres (jsquyres) wrote: > Another option to try is to install the openmx drivers on your system and run > open MPI with mx support. This should be much better perf than tcp. We've tried this on a big GigE cluster (in fact, Brice Goglin was playing with it on

Re: [OMPI users] difference between single and double precision

Yes, we have never really optimized open MPI for tcp. That is changing soon, hopefully. Regardless, what is the communication pattern of your app? Are you sending a lot of data frequently? Even the MPICH perf difference is surprising - it suggests a lot of data xfer, potentially with small

Re: [OMPI users] error mesages appeared but program runs successfully?

It means that you probably have a version mismatch with your OpenFabrics drivers and or you have no OpenFabrics hardware and you should probably disable those drivers. Sent from my PDA. No type good. On Dec 3, 2010, at 4:56 AM, "Daofeng Li" wrote: > Dear list, > > i am

Re: [OMPI users] Open MPI vs IBM MPI performance help

Collecting MPI Profile information might help narrow down the issue. You could use some of the tools mentioned here - http://www.open-mpi.org/faq/?category=perftools --Nysal On Wed, Dec 1, 2010 at 11:59 PM, Price, Brian M (N-KCI) < brian.m.pr...@lmco.com> wrote: > OpenMPI version: 1.4.3 > >

Re: [OMPI users] Infiniband problem, kernel mismatch

On Friday 19 November 2010 01:03:35 HeeJin Kim wrote: ... > * mlx4: There is a mismatch between the kernel and the userspace > libraries: Kernel does not support XRC. Exiting.* ... > What I'm thinking is that the infiniband card is installed but it doesn't > work in correct mode. > My linux

[OMPI users] error mesages appeared but program runs successfully?

Dear list, i am currently try to use the OpenMPI package i install it at my home directory ./configure --prefix=$HOME --enable-mpi-threads make make install and the i add the ~/bin to the path and ~/lib to the ld_library_path to my .bashrc file everything seems normal as i can run the example

[OMPI users] difference between single and double precision

Dear OpenMPI users I am dealing with an arithmetic problem. In fact, I have two variants of my code: one in single precision, one in double precision. When I compare the two executable built with MPICH, one can observed an expected difference of performance: 115.7-sec in single precision