about MPI_Comm_size(PETSC_COMM_WORLD,&size)

[Yixun Liu]

Hi,
Can I compiler and link it in VC enviroment and then copy the .exe to a directory. Then, at command line run mpiexec -n 2 xxx.exe? I try it, but the error is "Credentials for yxliu rejected connecting to dmrc-6700512 Aborting: Unable to connect to dmrc-6700512". I have used wmpiregister to register the accout correctly.

Best,
Yixun


  ----- Original Message ----- 
  From: Chris Harden 
  To: petsc-users at mcs.anl.gov 
  Sent: Thursday, October 26, 2006 10:37 AM
  Subject: Re: about MPI_Comm_size(PETSC_COMM_WORLD,&size)


  Hello,


  I think VC is ok for editing (maybe), but PETSc and mpich are easier to work with in the command line. You might save yourself some headache. Just paste your file into a plain text.cpp and put it in a directory such as your desktop. Then cd to your desktop and compile from the command line. I promise your life will be simpler in the long term.


  best,


  Chris




  On Oct 25, 2006, at 10:18 PM, Yixun Liu wrote:


    Hi,
    Â 
    Can I think that if I set -np 100, but only have 2 actually, the size will be 100?
    Another question,I run the progarm from VC++6.0 instead of command line. How to make the program run on 2 processors?
    Â 
    Best,
    Â 
    Yixun
      ----- Original Message -----
      From: Matthew Knepley
      To: petsc-users at mcs.anl.gov
      Sent: Thursday, October 26, 2006 9:47 AM
      Subject: Re: about MPI_Comm_size(PETSC_COMM_WORLD,&size)


      On 10/25/06, Yixun Liu <yxliu at fudan.edu.cn> wrote:
        Hi,
        Â 
        My computer is a standare dual processors PC of Dell corp., but after calling   ierr = PI_Comm_size(PETSC_COMM_WORLD,&size), I find the size is one. Is it correct?

      MPI only knows what mpiruns tells it. You ran the exampe with -np 1. If you use -np 2, then it will have size 2.

      Â  Matt



        Best,
        Â 
        Yixun
      --Â 
      "Failure has a thousand explanations. Success doesn't need one" -- Sir Alec Guiness




  Chris Harden
  Graduate Assistant
  School of Computational Science
  Florida State University
  446-B Dirac Science Library
  Tallahassee, Florida 32306-4120


  Voice: 850.644.3442
  E-mail: charden at scs.fsu.edu
  http://www.scs.fsu.edu/~charden/



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