Developer Reference for Intel® oneAPI Math Kernel Library - C

Developer Reference

  • 2021.1
  • 12/04/2020
  • Public Content
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.
Optimization Notice
Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.
Notice revision #20110804
This notice covers the following instruction sets: SSE2, SSE4.2, AVX2, AVX-512.

Product and Performance Information

1

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