Some Notes from MPICH2 Installation Guide

Offical ​User's Guide

• MPICH2 test examples - cpi
  • in Offical ​User's Guide

    mpd &
    cd /home/you/mpich2-installed/examples
    mpiexec -n 3 cpi
    mpdallexit
    

  • in Debian environment

    jazz@bio-cluster-12:~$ mpd &
    [1] 3551
    jazz@bio-cluster-12:~$ mpiexec -n 3 /usr/share/mpich2/examples/cpi
    Process 1 of 3 is on bio-cluster-12
    Process 2 of 3 is on bio-cluster-12
    Process 0 of 3 is on bio-cluster-12
    pi is approximately 3.1415926544231318, Error is 0.0000000008333387
    wall clock time = 0.001213
    jazz@bio-cluster-12:~$ mpdallexit
    

• Compiling and Linking
  • 4.3 Special Issues for C++
    • Some users may get error messages such as

      SEEK_SET is #defined but must not be for the C++ binding of MPI
      

    • The problem is that both stdio.h and the MPI C++ interface use SEEK SET, SEEK CUR, and SEEK END. This is really a bug in the MPI-2 standard. You can try adding following definition to the command line

      -DMPICH_IGNORE_CXX_SEEK
      

• 5.1 Standard mpiexec
  • Currently, MPICH2 does not fully support calling the dynamic process routines from MPI-2 (e.g., MPI_Comm_spawn or MPI_Comm_accept) from processes that are not started with mpiexec.
  • Note: this might be the reason why we encounter R-MPI mpi.spawn.Rslaves() problem.

• 5.3.1 Basic mpiexec arguments for MPD
  • You can use mpiexec to run non-MPI programs as well. This is sometimes useful in making sure all the machines are up and ready for use. Useful examples include

    mpiexec -n 10 hostname
    mpiexec -n 10 printenv
    

Offical ​Installer's Guide

​MPICH2 Installation and Configuration Guide

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