IBM Books

Planning Volume 2, Control Workstation and Software Environment

Planning for Parallel Environment

The IBM Parallel Environment for AIX program product is designed to help you develop parallel programs and execute them on the SP system or a networked cluster of RS/6000 processors.

The main Parallel Environment components are:

Nodes operating with PSSP 2.3 or later and AIX 4.2.1 or later, support the Parallel Environment. Parallel Environment 2.4 or later has support for the Message Passing Library (MPL) subroutines, the Message Passing Interface (MPI) standard, and the Low Level Applications Programming Interface (LAPI). |If you plan to develop applications using the LAPI component of PSSP |3.4, you must use Parallel Environment 3.1 or later. See Chapter 11, Planning for migration for more release level compatibility |information.

Be aware that parts of the Parallel Environment installation steps might interact with or be affected by PSSP component installations, particularly the switch services component of PSSP (ssp.css) and the SP security services (ssp.clients). See the book PE: Installation Guide for details on planning for and installing Parallel Environment, particularly if you are interested in any of the following:

Be sure to address the following considerations:

  1. Ticket and credentials lifetimes.
  2. What ticket and credential lifetimes need to be set with respect to PE and LoadLeveler. The lifetime needs to be long enough to allow for the expected longest running job to complete.
  3. DCE server replication when large numbers of tasks are to be used.
  4. The DCE user id is used if it is different from the AIX user id. IBM suggests you use DCE integrated login.

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