Re: [OMPI users] Open MPI and env. variables (LD_LIBRARY_PATH and PATH) - complete and utter Open MPI / Linux noob

On Aug 6, 2009, at 2:43 PM, Tomislav Maric wrote: the problem wasn't only in the OMPI libs and bins, it was in other binaries as well: OpenFOAM simulation suite is also installed locally so a short PATH could't be informative enough. Actually, I know that the environment is exactly the

Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on IB

Craig, Let me look at your script, if you'd like... I may be able to help there. I've also been seeing some "interesting results for WRF on OpenMPI, and we may want to see if we're taking complimentary approaches... gerry Craig Tierney wrote: A followup Part of problem was affinity.

Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on IB

Gus Correa wrote: > Hi Craig, list > > I suppose WRF uses MPI collective calls (MPI_Reduce, > MPI_Bcast, MPI_Alltoall etc), > just like the climate models we run here do. > A recursive grep on the source code will tell. > I will check this out. I am not the WRF expert, but I was under the

Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on IB

A followup Part of problem was affinity. I had written a script to do processor and memory affinity (which works fine with MVAPICH2). It is an idea that I got from TACC. However, the script didn't seem to work correctly with OpenMPI (or I still have bugs). Setting --mca

Re: [OMPI users] Performance question about OpenMPI and MVAPICH2 on IB

Hi Craig, list I suppose WRF uses MPI collective calls (MPI_Reduce, MPI_Bcast, MPI_Alltoall etc), just like the climate models we run here do. A recursive grep on the source code will tell. If that is the case, you may need to tune the collectives dynamically. We are experimenting with tuned

Re: [OMPI users] 2 to 1 oversubscription

On Mon, Jul 13, 2009 at 01:24:54PM -0400, Mark Borgerding wrote: > > Here's my advice: Don't trust anyones advice. Benchmark it yourself and > see. > > The problems vary so wildly that only you can tell if your problem will > benefit from over-subscription. It really depends on too many

[OMPI users] Performance question about OpenMPI and MVAPICH2 on IB

I am running openmpi-1.3.3 on my cluster which is using OFED-1.4.1 for Infiniband support. I am comparing performance between this version of OpenMPI and Mvapich2, and seeing a very large difference in performance. The code I am testing is WRF v3.0.1. I am running the 12km benchmark. The two

Re: [OMPI users] Open MPI and env. variables (LD_LIBRARY_PATH and PATH) - complete and utter Open MPI / Linux noob

Hi Jeff, thank you very much for your reply! :) the problem wasn't only in the OMPI libs and bins, it was in other binaries as well: OpenFOAM simulation suite is also installed locally so a short PATH could't be informative enough. Actually, I know that the environment is exactly the same,

Re: [OMPI users] Open MPI and env. variables (LD_LIBRARY_PATH and PATH) - complete and utter Open MPI / Linux noob

Sorry for not replying earlier -- travel to the MPI Forum last week put me wy behind on my INBOX. :-( I don't think you want to "printenv > ~/.ssh/environment" -- you don't/ can't know for sure that the remote environment should be exactly the same as your local environment. Instead,

Re: [OMPI users] Kerberos ticket forwarding

On Aug 4, 2009, at 5:15 PM, Jean-Christophe Ducom wrote: When I try dqcneh001$ mpirun -np 1 -H dqcneh002 -mca plm_rsh_agent "/usr/kerberos/bin/rsh -F" klist klist: No credentials cache found (ticket cache FILE:/tmp/ krb5cc_p3651) Kerberos 4 ticket cache: /tmp/tkt82784 klist: You have no

Re: [OMPI users] Bus Error (7) on PS3 running HPL (OpenMPI 1.2.8)

Any chance you could re-try the experiment with Open MPI 1.3.3? On Aug 4, 2009, at 11:10 AM, Hoelzlwimmer Andreas - S0810595005 wrote: Hello, I’ve wanted to run MPI on a couple of PS3 here. According to a colleague who set it up, I had to set several HugePages. As the PS3 RAM is limited I

Re: [OMPI users] mpicxx and LD_RUN_PATH

I'm not sure what you're asking -- mpicxx just fork/exec's the underlying compiler (you can "mpicxx --showme" to see what it does). What do you need it to do with LD_RUN_PATH? On Aug 3, 2009, at 4:21 PM, John R. Cary wrote: In the latest versions of libtool, the runtime library path is

Re: [OMPI users] Parallel Quicksort

Thanks a lot , I really appreciate it.! Now I'm on my way to install OpenFOAM and try it out. On Wed, Aug 5, 2009 at 11:59 PM, Mattijs Janssens wrote: > On Thursday 06 August 2009 10:17:36 Prasadcse Perera wrote: > > Hello All, > > This may not be something relates to

Re: [OMPI users] Performance difference on OpenMPI, IntelMPI and ScaliMPI

Pasha, se attached file. I have traced how MPI_IPROBE is called and also managed to significantly reduce the number of calls to MPI_IPROBE. Unfortunately this only resulted in the program spending time in other routines. Basically the code runs through a number of timesteps and after each

Re: [OMPI users] Parallel Quicksort

On Thursday 06 August 2009 10:17:36 Prasadcse Perera wrote: > Hello All, > This may not be something relates to the forum, so sorry for asking this > first of all :). Currently I have been working on an implementation of > parallel Quicksort using MPI and now I need some standard parallel >

[OMPI users] Parallel Quicksort

Hello All, This may not be something relates to the forum, so sorry for asking this first of all :). Currently I have been working on an implementation of parallel Quicksort using MPI and now I need some standard parallel Quicksort implementation(s) for a performance evaluation. So can someone