Developer Reference

Contents

BLACS Routines

Intel® oneAPI
Math Kernel Library
implements
FORTRAN 77 routines from the BLACS (Basic Linear Algebra Communication Subprograms) package. These routines are used to support a linear algebra oriented message passing interface that may be implemented efficiently and uniformly across a large range of distributed memory platforms.
The BLACS routines make linear algebra applications both easier to program and more portable. For this purpose, they are used in
Intel® oneAPI Math Kernel Library
intended for the Linux* and Windows* OSs as the communication layer of ScaLAPACK and Cluster FFT.
On computers, a linear algebra matrix is represented by a two dimensional array (2D array), and therefore the BLACS operate on 2D arrays. See description of the basic matrix shapes in a special
topic
.
The BLACS routines implemented in
Intel® oneAPI Math Kernel Library
are of four categories:
  • Combines
  • Point to Point Communication
  • Broadcast
  • Support.
The Combines take data distributed over processes and combine the data to produce a result. The Point to Point routines are intended for point-to-point communication and Broadcast routines send data possessed by one process to all processes within a scope.
The Support routines perform distinct tasks that can be used for initialization, destruction, information, and miscellaneous tasks.
Product and Performance Information
Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.
Notice revision #20201201

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.