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This redbook is designed to familiarize you with the IBM eServer pSeries POWER4 microarchitecture and to provide you with the information necessary to exploit the new high-end servers based on this architecture. The eight to 32-way symmetric multiprocessing (SMP) pSeries 690 Model 681 will be the first POWER4 system to be available. Thus, most analysis presented in this publication refers to this system. Specifically, this publication will address the following issues: POWER4 features and capabilities Processor and memory optimization techniques, especially for Fortran programming AIX XL Fortran Version 7.1.1 compiler capabilities and which options to use Parallel processing techniques and performance Available libraries and programming interfaces Performance examples of commonly used kernels While this publication is decidedly technical in nature, the fundamental concepts are presented from a user point of view and numerous examples are provided to reinforce these concepts.

This redbook provides detailed coverage of the scientific and technical software available on IBM RS/6000 Scalable POWERparallel systems for numeric intensive computing (NIC) applications. The redbook discusses the following software programs in depth. IBM Parallel Environment Version 2 Release 1 for AIX. The new Message Passing Interface (MPI) subroutines. IBM PVMe Version 2 Release 1 (which is now externally compatible with the public domain PVM 3.3.7). IBM Parallel ESSL Version 1 Release 1 for AIX Version 4. IBM Parallel OSL Version 1 Release 1 for AIX. IBM XL High Performance Fortran Version 1 Release 1 for AIX. This redbook is of value to IBM specialists and customer specialists who will be developing and administering end-user education. It is in technical presentation format, with foils and related notes to the speaker included, and can also be used as a student handout. Some knowledge of the AIX 4.1.3 operating system, RISC/6000 SP architecture, and parallel programming a