MPICH-SCore Getting Started

Introduction

Prerequisites:

• You need to know how to log in to and run programs on the SCore environment.
• MPICH-SCore should be compiled without any problem and installed properly.
• You have an MPI application that you quickly want to compile and get running on the cluster.

MPICH-SCore is an MPI library based on MPICH version 1.2 that supports MPI-1 and a part of MPI-2, which are the MPI standard. Your MPI application may run on it without any problem if the application is running using MPICH. MPICH-SCore runs on top of the SCore-D operationg system produced by RWCP. Thus the user is able to use the job scheduler and the checkpointing facility without any modification to the MPI application. A batch job system PBS is also available. Since MPICH-SCore uses PM as an underlying message passing system, MPICH-SCore supports all combination of network devicies supported by PM.

This distribution package includes two versions of MPICH-SCore. One is ch_score (MPICH-SCore version 1.0). The other is ch_score2 (MPICH-SCore version 2.0). Although the performance of ch_score2 is better than ch_score, ch_score2 is not tested so long time.

Here are the steps required to compile and run your program:

1. Compile and link with mpicc(1), mpic++(1) or mpif77(1)
2. Run using mpirun(1) or scrun(1)

You may choose one of the two versions of MPICH-SCore when invoking mpicc, mpic++, or mpif77. The default is ch_score. If you want to use ch_score2, specify the option "-device ch_score2". The runtime option of the generated binary is different from that of the other version. Please check the following documents.

• MPICH-SCore version 1.0 (ch_score)
  • Compilation of an MPI application
  • Running an MPI application
• MPICH-SCore version 2.0 (ch_score2)
  • Compilation of an MPI application
  • Running an MPI application

Restrictions

• MPI functions cannot be used within an MPC++ MTTL application.
• The current versions of MPICH-SCore do not support heterogenous environments.
• MPICH-SCore version 2.0 (ch_score2) does not support MPI_CANCEL in MPI-1.2.
• MPI-1, MPI-2 features supported by MPICH-SCore are described in the MPICH 1.2.0 pages .
• MPI applications on top of the MPICH-SCore are restricted by the SCore environment also.
• See the description for the checkpointing facility when you use it. The user should not use PM remote memory access facility when checkpointing.

See also

• MPICH-SCore version 1.0 (ch_score): Compilation of an MPI application
• MPICH-SCore version 1.0 (ch_score): Running of an MPI application
• MPICH-SCore version 2.0 (ch_score2): Compilation of an MPI application
• MPICH-SCore version 2.0 (ch_score2): Running of an MPI application

mpic++(1), mpicc(1), mpif77(1), mpirun(1)

How to use optional compilers

Back to MPICH-SCore Getting Started.

PC Cluster Consotium