Hi, Antonio Thanks a lot for your reply. I run my program on 64 bit OS for each nodes. Do you know how can overcome this OS problems? Should I add compile flags as mpicc -m64 ....? Thanks a lot! Sufeng On Sat, Jun 15, 2013 at 10:03 AM, <[email protected]> wrote:

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Today's Topics:

1. Re: MPI server setup issue (Antonio J. Pe?a) 2. Re: Running an mpi program that needs to access /dev/mem (Jim Dinan)

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Message: 1 Date: Fri, 14 Jun 2013 16:46:20 -0500 From: Antonio J. Pe?a <[email protected]> To: [email protected] Subject: Re: [mpich-discuss] MPI server setup issue Message-ID: <[email protected]> Content-Type: text/plain; charset="iso-8859-1"

Hi Sufeng,

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On Friday, June 14, 2013 04:35:39 PM Sufeng Niu wrote:

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Hello,

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I am a beginner on MPI programming, and right now I am working on an MPI project. I got a few questions related to implementation issues:

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1. when I run a simple MPI hello world on multiple nodes, (I already installed mpich3 library on master node, mount the nfs, shared the executable file and mpi library, set slave node to be keyless ssh), my program was stoped there say: bash: /mnt/mpi/mpich-install/bin/hydra_pmi_proxy: /lib/ld-linux.so.2: bad ELF interpreter: No such file or directory. I can not get rid of it for a long times. even though I reset everything (I already add PATH=/mnt/mpi/mpich-install/bin:$PATH in .bash_profile). Do you have any clues on this problems?

This issue may be related to mismatch between 32 and 64 bit libraries. Are you running 64 or 32 bit operating systems in all of your nodes consistently?

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2. for multiple servers, each of them has 10G ethernet card. for example, one network card address is eth5: 10.0.5.55. So if I want to launch MPI communication through 10G network card. Should I set the hostfile as: 10.0.5.55:$(PROCESS_NUM)? Or using iface eth5

You can address those nodes by either IP or DNS name in the hostfile, depending on how your system is configured. Using IP addresses is completely OK.

Best, Antonio

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Thanks a lot!

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-- Best Regards, Sufeng Niu ECASP lab, ECE department, Illinois Institute of Technology Tel: 312-731-7219