Revision as of 08:25, 21 April 2017

Application Details

• Description: openBLAS (open Basic Linear Algebra Subprograms) API library routines
• Version: 0.2.19 and 0.2.18
• Module: openblas/0.2.19/gcc-4.9.3 and openblas/gcc/0.2.18
• Licence: 3-clause BSD license

Usage Examples

OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version.

OpenBLAS adds optimized implementations of linear algebra kernels for several processor architectures, including Intel Sandy Bridge. It claims to achieve performance comparable to the Intel MKL.

Module

This shows the openblas module being loaded and a test.c program being compiled with the library:

[username@login01 ~]$ module add openblas/0.2.19/gcc-4.9.3

[username@login01 ~]$ module add gcc/4.9.3
[username@login01 ~]$ gcc -o test test.c -I  -lopenblas

If the library is multithreaded, please add -lpthread. If the library contains LAPACK functions, please add -lgfortran or other Fortran libs.

Example

This example shows calling cblas_dgemm in C. https://gist.github.com/xianyi/6930656

#include <cblas.h>
#include <stdio.h>

void main()
{
  int i=0;
  double A[6] = {1.0,2.0,1.0,-3.0,4.0,-1.0};         
  double B[6] = {1.0,2.0,1.0,-3.0,4.0,-1.0};  
  double C[9] = {.5,.5,.5,.5,.5,.5,.5,.5,.5}; 
  cblas_dgemm(CblasColMajor, CblasNoTrans, CblasTrans,3,3,2,1,A, 3, B, 3,2,C,3);

  for(i=0; i<9; i++)
    printf("%lf ", C[i]);
  printf("\n");
}

Again compilation here would be the following:

[username@login01 ~]$ gcc -o test_cblas_open test_cblas_dgemm.c  -lopenblas -lpthread -lgfortran

Further Information

• http://www.openblas.net/

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