ESSL
IBM Engineering and Scientific Software Library

ESSL is an optimized software library provided by IBM.

The library includes optimized versions of some, but not all of the BLAS Level 1, BLAS Level 2, and BLAS Level 3 basic linear algebra libraries, and the LAPACK linear system library.

The library includes sets of routines to handle:

• matrix operations;
• linear algebraic equations (dense, banded, sparse);
• eigensystem analysis;
• Fourier Transforms, Convoluations, Correlations;
• Sorting and Searching;
• Interpolation;
• Quadrature;
• Random Number Generation;

The library is precompiled, and can be accessed by including the -lessl switch in your compile statement:

        xlf myprog.f -lessl
      

Related Data and Programs:

BLAS1 is a FORTRAN90 library which contains a set of routines for vector operations.

BLAS2 is a FORTRAN90 library which contains a set of routines for matrix-vector operations.

BLAS3 is a FORTRAN90 library which contains a set of routines for matrix-matrix operations.

LAPACK is a FORTRAN90 library which is a standard linear algebra package.

PESSL is a version of ESSL which is suitable for use in parallel programming.

Reference:

1. Edward Anderson, Zhaojun Bai, Christian Bischof, Susan Blackford, James Demmel, Jack Dongarra, Jeremy Du Croz, Anne Greenbaum, Sven Hammarling, Alan McKenney, Danny Sorensen,
   LAPACK User's Guide,
   Third Edition,
   SIAM, 1999,
   QA76.73.F25L36
2. Charles Lawson, Richard Hanson, David Kincaid, Fred Krogh,
   Basic Linear Algebra Subprograms for FORTRAN Usage,
   ACM Transactions on Mathematical Software,
   Volume 5, Number 3, pages 308-323, 1979.
3. Engineering and Scientific Subroutine Library (ESSL) for AIX,
   Guide and Reference,
   Version 4, Release 1, IBM,
   ../../pdf/ibm/essl_v4r1.pdf;

Examples and Tests:

• essl_prb.f90, a sample calling program;
• essl_prb_eclipse.ll, an IBM LoadLeveler command file to compile, link and run the calling program on Eclipse;
• essl_prb_eclipse_output.txt, output from the calling program;

You can go up one level to the FORTRAN90 source codes.