Parallel Engineering and Scientific Subroutine Library (PESSL)

For complete documentation, see

• Parallel Engineering and Scientific Subroutine Library (PESSL) Documentation

Parallel ESSL is a scalable mathematical subroutine library that supports parallel processing applications on IBM RS/6000* SP* Systems. Parallel ESSL supports the Single Program Multiple Data (SPMD) programming model using the Message Passing Interface (MPI) library.

The PESSL library is not loaded by default. You must link with the PESSL library when you compile your program. An example compile line is

64-bit (Bassi default)

% mpxlf90 -o executable_name mycode.f -lesslsmp -lpesslsmp -lblacssmp -I/usr/lpp/pessl.rte.common/include/64

Parallel ESSL provides subroutines in six major areas of mathematical computations:

• Level 2 Parallel Basic Linear Algebra Subprograms (PBLAS)
• Level 3 PBLAS
• Linear Algebraic Equations
• Eigensystem Analysis and Singular Value Analysis
• Fourier Transforms
• Random Number Generation

For communication, Parallel ESSL includes a subset of the Basic Linear Algebra Communications Subprograms (BLACS), which use the Message Passing Interface (MPI).