OpenBLAS/benchmark/linpack.c

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/* Copyright 2009, 2010 The University of Texas at Austin.           */
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#include "bench.h"

double fabs(double);

#undef GETRF
#undef GETRS

#ifndef COMPLEX
#ifdef XDOUBLE
#define GETRF   BLASFUNC(qgetrf)
#define GETRS   BLASFUNC(qgetrs)
#elif defined(DOUBLE)
#define GETRF   BLASFUNC(dgetrf)
#define GETRS   BLASFUNC(dgetrs)
#else
#define GETRF   BLASFUNC(sgetrf)
#define GETRS   BLASFUNC(sgetrs)
#endif
#else
#ifdef XDOUBLE
#define GETRF   BLASFUNC(xgetrf)
#define GETRS   BLASFUNC(xgetrs)
#elif defined(DOUBLE)
#define GETRF   BLASFUNC(zgetrf)
#define GETRS   BLASFUNC(zgetrs)
#else
#define GETRF   BLASFUNC(cgetrf)
#define GETRS   BLASFUNC(cgetrs)
#endif
#endif

int main(int argc, char *argv[]){

  FLOAT *a, *b;
  blasint *ipiv;

  blasint m, i, j, info;
  blasint unit =   1;

  int from =   1;
  int to   = 200;
  int step =   1;

  FLOAT maxerr;

  double time1, time2;

  argc--;argv++;

  if (argc > 0) { from     = atol(*argv);		argc--; argv++;}
  if (argc > 0) { to       = MAX(atol(*argv), from);	argc--; argv++;}
  if (argc > 0) { step     = atol(*argv);		argc--; argv++;}

  fprintf(stderr, "From : %3d  To : %3d Step = %3d\n", from, to, step);

  if (( a = (FLOAT *)malloc(sizeof(FLOAT) * to * to * COMPSIZE)) == NULL){
    fprintf(stderr,"Out of Memory!!\n");exit(1);
  }

  if (( b = (FLOAT *)malloc(sizeof(FLOAT) * to * COMPSIZE)) == NULL){
    fprintf(stderr,"Out of Memory!!\n");exit(1);
  }

  if (( ipiv = (blasint *)malloc(sizeof(blasint) * to * COMPSIZE)) == NULL){
    fprintf(stderr,"Out of Memory!!\n");exit(1);
  }

#ifdef __linux
  srandom(getpid());
#endif

  fprintf(stderr, "   SIZE       Residual     Decompose            Solve           Total\n");

  for(m = from; m <= to; m += step){

    fprintf(stderr, " %6d : ", (int)m);

    for(j = 0; j < m; j++){
      for(i = 0; i < m * COMPSIZE; i++){
	a[(long)i + (long)j * (long)m * COMPSIZE] = ((FLOAT) rand() / (FLOAT) RAND_MAX) - 0.5;
      }
    }

    for (i = 0; i < m * COMPSIZE; ++i) b[i] = 0.;

    for (j = 0; j < m; ++j) {
      for (i = 0; i < m * COMPSIZE; ++i) {
	b[i] += a[(long)i + (long)j * (long)m * COMPSIZE];
      }
    }

    begin();

    GETRF (&m, &m, a, &m, ipiv, &info);

    end();

    if (info) {
      fprintf(stderr, "Matrix is not singular .. %d\n", info);
      exit(1);
    }

    time1 = getsec();

    begin();

    GETRS("N", &m, &unit, a, &m, ipiv, b, &m, &info);

    end();

    if (info) {
      fprintf(stderr, "Matrix is not singular .. %d\n", info);
      exit(1);
    }

    time2 = getsec();

    maxerr = 0.;

    for(i = 0; i < m; i++){
#ifndef XDOUBLE
      if (maxerr < fabs(b[i * COMPSIZE] - 1.0)) maxerr = fabs(b[i * COMPSIZE] - 1.0);
#ifdef COMPLEX
      if (maxerr < fabs(b[i * COMPSIZE] + 1)) maxerr = fabs(b[i * COMPSIZE + 1]);
#endif
#else
      if (maxerr < fabsl(b[i * COMPSIZE] - 1.0L)) maxerr = fabsl(b[i * COMPSIZE] - 1.0L);
#ifdef COMPLEX
      if (maxerr < fabsl(b[i * COMPSIZE] + 1)) maxerr = fabsl(b[i * COMPSIZE + 1]);
#endif
#endif
    }

#ifdef XDOUBLE
    fprintf(stderr,"  %Le ", maxerr);
#else
    fprintf(stderr,"  %e ", maxerr);
#endif

    fprintf(stderr,
	    " %10.2f MFlops %10.2f MFlops %10.2f MFlops\n",
	    COMPSIZE * COMPSIZE * 2. / 3. * (double)m * (double)m * (double)m / time1 * 1.e-6,
	    COMPSIZE * COMPSIZE * 2.      * (double)m * (double)m             / time2 * 1.e-6,
	    COMPSIZE * COMPSIZE * (2. / 3. * (double)m * (double)m * (double)m + 2. * (double)m * (double)m) / (time1 + time2) * 1.e-6);

#if 0
    if (
#ifdef DOUBLE
	maxerr > 1.e-8
#else
	maxerr > 1.e-1
#endif
	) {
      fprintf(stderr, "Error is too large.\n");
      exit(1);
    }
#endif

  }

  return 0;
}

// void main(int argc, char *argv[]) __attribute__((weak, alias("MAIN__")));