You also might want to resend this to the MPICH mailing list – this is the Open MPI mailing list


On 7/2/08 8:03 AM, "Swamy Kandadai" <> wrote:

May be you do not have 12 entries in your machine.list file. You need to have atleast np lines in your machine.list

Dr. Swamy N. Kandadai
IBM Senior Certified Executive IT Specialist
STG WW  Modular Systems Benchmark Center
STG WW HPC and BI CoC Benchmark Center
Phone:( 845) 433 -8429 (8-293) Fax:(845)432-9789

"Aditya Vasal" <>





[OMPI users] Need some help regarding Linpack execution

I want to perform LINPACK test on my m/c, I have only 1 GB RAM on the m/c where I want to run 12 parallel Linpack processes on SLES 10.
I am using of Mpich-1.2.7p1. (Mpich is built with –rsh=ssh option)
I have modified HPL.dat accordingly,
            P = 3
            Q = 4    (so as to make PxQ = 12)
            N =
8640 (so as to make use of only 56% of available memory and leave rest for host processes)
            NB = 11520
I have also set ulimit –l unlimited..
Created a machine.list file by specifying my m/c’s IP address 12 times. (So as to execute all 12 processes on the same m/c) and using GotoBLAS for the Linpack execution
Execution command:
mpirun –np 12 –machinefile machine.list xhpl
Upon execution, I get following error:
            HPL ERROR from process # 0, on line 419 of function HPL_pdinfo:
>>> Need at least 12 processes for these tests <<<

Please guide me where am I going wrong

Best Regards,
Aditya  Vasal

Software Engg | Semiconductor Solutions Group |KPIT Cummins Infosystems Ltd. | +91 99 70 168 581 | <> | <blocked::>
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