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/* -*- mode: C; tab-width: 2; indent-tabs-mode: nil; fill-column: 79; coding: iso-latin-1-unix -*- */
/* tstdgemm.c
*/
#include <hpcc.h>
/* Generates random matrix with entries between 0.0 and 1.0 */
static void
dmatgen(int m, int n, double *a, int lda, int seed) {
int i, j;
double *a0 = a, rcp = 1.0 / RAND_MAX;
srand( seed );
for (j = 0; j < n; j++) {
for (i = 0; i < m; i++)
a0[i] = rcp * rand();
a0 += lda;
}
}
static double
dnrm_inf(int m, int n, double *a, int lda) {
int i, j, k, lnx;
double mx, *a0;
int nx = 10;
double x[10];
mx = 0.0;
for (i = 0; i < m; i += nx) {
lnx = Mmin( nx, m-i );
for (k = 0; k < lnx; ++k) x[k] = 0.0;
a0 = a + i;
for (j = 0; j < n; ++j) {
for (k = 0; k < lnx; ++k)
x[k] += fabs( a0[k] );
a0 += lda;
}
for (k = 0; k < lnx; ++k)
if (mx < x[k]) mx = x[k];
}
return mx;
}
int
HPCC_TestDGEMM(HPCC_Params *params, int doIO, double *UGflops, int *Un, int *Ufailure) {
int n, lda, ldb, ldc, failure = 1;
double *a, *b, *c, *x, *y, *z, alpha, beta, sres, cnrm, xnrm;
double Gflops = 0.0, dn, t0, t1;
long l_n;
FILE *outFile;
int seed_a, seed_b, seed_c, seed_x;
if (doIO) {
outFile = fopen( params->outFname, "a" );
if (! outFile) {
outFile = stderr;
fprintf( outFile, "Cannot open output file.\n" );
return 1;
}
}
n = (int)(sqrt( params->HPLMaxProcMem / sizeof(double) / 3 + 0.25 ) - 0.5);
if (n < 0) n = -n; /* if 'n' has overflown an integer */
l_n = n;
lda = ldb = ldc = n;
a = HPCC_XMALLOC( double, l_n * l_n );
b = HPCC_XMALLOC( double, l_n * l_n );
c = HPCC_XMALLOC( double, l_n * l_n );
x = HPCC_XMALLOC( double, l_n );
y = HPCC_XMALLOC( double, l_n );
z = HPCC_XMALLOC( double, l_n );
if (! a || ! b || ! c || ! x || ! y || ! z) {
goto comp_end;
}
seed_a = (int)time( NULL );
dmatgen( n, n, a, n, seed_a );
seed_b = (int)time( NULL );
dmatgen( n, n, b, n, seed_b );
seed_c = (int)time( NULL );
dmatgen( n, n, c, n, seed_c );
seed_x = (int)time( NULL );
dmatgen( n, 1, x, n, seed_x );
alpha = a[n / 2];
beta = b[n / 2];
t0 = MPI_Wtime();
HPL_dgemm( HplColumnMajor, HplNoTrans, HplNoTrans, n, n, n, alpha, a, n, b, n, beta, c, n );
t1 = MPI_Wtime();
t1 -= t0;
dn = (double)n;
if (t1 != 0.0 && t1 != -0.0)
Gflops = 2.0e-9 * dn * dn * dn / t1;
else
Gflops = 0.0;
cnrm = dnrm_inf( n, n, c, n );
xnrm = dnrm_inf( n, 1, x, n );
/* y <- c*x */
HPL_dgemv( HplColumnMajor, HplNoTrans, n, n, 1.0, c, ldc, x, 1, 0.0, y, 1 );
/* z <- b*x */
HPL_dgemv( HplColumnMajor, HplNoTrans, n, n, 1.0, b, ldb, x, 1, 0.0, z, 1 );
/* y <- alpha * a * z - y */
HPL_dgemv( HplColumnMajor, HplNoTrans, n, n, alpha, a, lda, z, 1, -1.0, y, 1 );
dmatgen( n, n, c, n, seed_c );
/* y <- beta * c_orig * x + y */
HPL_dgemv( HplColumnMajor, HplNoTrans, n, n, beta, c, ldc, x, 1, 1.0, y, 1 );
sres = dnrm_inf( n, 1, y, n ) / cnrm / xnrm / n / HPL_dlamch( HPL_MACH_EPS );
if (doIO) fprintf( outFile, "Scaled residual: %g\n", sres );
if (sres < params->test.thrsh)
failure = 0;
comp_end:
if (z) HPCC_free( z );
if (y) HPCC_free( y );
if (x) HPCC_free( x );
if (c) HPCC_free( c );
if (b) HPCC_free( b );
if (a) HPCC_free( a );
if (doIO) {
fflush( outFile );
fclose( outFile );
}
if (UGflops) *UGflops = Gflops;
if (Un) *Un = n;
if (Ufailure) *Ufailure = failure;
return 0;
}
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