HP MLIB User's Guide Vol. 2 7th Ed.

Chapter 10 Introduction to ScaLAPACK 689

Overview

10 Introduction to ScaLAPACK

Overview

This chapter provides a brief overview of HP’s implementation of ScaLAPACK

functionality.

ScaLAPACK is a library of high-performance linear algebra routines capable of

solving systems of linear equations, linear least squares problems, eigenvalue

problems, and singular value problems. ScaLAPACK can also handle many

associated computations such as matrix factorizations or estimating condition

numbers.

ScaLAPACK is a public domain software that was developed by Oak Ridge

National Laboratory. It is designed for distributed computing and uses the

Message Passing Interface (MPI) for parallelism. This implementation provides

a version of ScaLAPACK tuned on HP servers and built with HP’s MPI. The

ScaLAPACK library routines are written in Fortran 77 and are callable from

Fortran 90 and C routines.

NOTE The ScaLAPACK8 library assumes all integers are 8 bytes in length but

array lengths should not exceed 4 byte integer values. That is,

ScaLAPACK8 integer arrays can store any 8 byte integer value, but the

length of the arrays must be smaller than 2

. This reﬂects the current

HP MPI 1.8 functionality.

HP MLIB provides the standard ScaLAPACK V1.7 man pages for individual

subprograms. Refer to these for usage, input/output arguments, and examples.