Guide and Reference

Changes for Parallel ESSL Release 2.1 for AIX

• The format of the array descriptors has been changed in Parallel ESSL Release 2.1 to maintain compatibility with ScaLAPACK 1.2. Therefore, you must either change the way you code array descriptors in your existing application programs, or set and export the PESSL_DESC_TYPE environment variable. If you do not change the array descriptors or use the environment variable, Parallel ESSL Release 2.1 issues an error message and terminates your program.

  For more information on the new format for array descriptors, see "Migrating Your Program".

• The Banded Linear Algebraic Equations subroutines now include solutions to linear systems of equations for real positive definite symmetric tridiagonal matrices.