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/*
* -- MAGMA (version 2.9.0) --
* Univ. of Tennessee, Knoxville
* Univ. of California, Berkeley
* Univ. of Colorado, Denver
* @date January 2025
*
* @precisions normal z -> c d s
*
**/
/* includes, system */
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
/* includes, project */
#include "flops.h"
#include "magma_v2.h"
#include "magma_lapack.h"
#include "magma_types.h"
#include "testings.h"
/* ////////////////////////////////////////////////////////////////////////////
-- Testing zpotrf_mgpu
*/
int main( int argc, char** argv)
{
TESTING_CHECK( magma_init() );
magma_print_environment();
/* Constants */
const magmaDoubleComplex c_neg_one = MAGMA_Z_NEG_ONE;
const magma_int_t ione = 1;
/* Local variables */
real_Double_t gflops, gpu_perf, gpu_time, cpu_perf, cpu_time;
double Anorm, error, work[1];
magmaDoubleComplex *h_A, *h_R;
magmaDoubleComplex_ptr d_lA[4] = {NULL, NULL, NULL, NULL};
magma_int_t N, n2, lda, ldda, info;
magma_int_t j, k, ngpu0 = 1, ngpu;
magma_int_t ISEED[4] = {0,0,0,1};
magma_int_t nb, nk, n_local, ldn_local;
magma_opts opts;
opts.parse_opts( argc, argv );
opts.ngpu = abs( opts.ngpu ); // always uses multi-GPU code
ngpu0 = opts.ngpu;
printf("%% ngpu = %lld, uplo = %s\n", (long long) opts.ngpu, lapack_uplo_const(opts.uplo) );
printf("%% N CPU Gflop/s (sec) MAGMA Gflop/s (sec) ||R_magma - R_lapack||_F / ||R_lapack||_F\n");
printf("%%============================================================================================\n");
for( int itest = 0; itest < opts.ntest; ++itest ) {
for( int iter = 0; iter < opts.niter; ++iter ) {
N = opts.nsize[itest];
lda = N;
n2 = lda*N;
ldda = magma_roundup( N, opts.align ); // multiple of 32 by default
gflops = FLOPS_ZPOTRF( N ) / 1e9;
magma_setdevice(0);
TESTING_CHECK( magma_zmalloc_cpu( &h_A, n2 ));
TESTING_CHECK( magma_zmalloc_pinned( &h_R, n2 ));
nb = magma_get_zpotrf_nb(N);
if ( ngpu0 > N / nb ) {
ngpu = N / nb;
if ( N % nb != 0 ) ngpu++;
printf( " * too many gpus for the matrix size, using %lld gpus\n", (long long) ngpu );
} else {
ngpu = ngpu0;
}
for (j = 0; j < ngpu; j++) {
n_local = nb*(N /(nb * ngpu));
if (j < (N / nb) % ngpu)
n_local += nb;
else if (j == (N / nb) % ngpu)
n_local += N % nb;
ldn_local = magma_roundup( n_local, opts.align ); // multiple of 32 by default
ldn_local = (ldn_local % 256 == 0) ? ldn_local + 32 : ldn_local;
magma_setdevice(j);
TESTING_CHECK( magma_zmalloc( &d_lA[j], ldda * ldn_local ));
}
/* Initialize the matrix */
if (opts.check) {
lapackf77_zlarnv( &ione, ISEED, &n2, h_A );
magma_zmake_hpd( N, h_A, lda );
lapackf77_zlacpy( MagmaFullStr, &N, &N, h_A, &lda, h_R, &lda );
} else {
lapackf77_zlarnv( &ione, ISEED, &n2, h_A );
magma_zmake_hpd( N, h_A, lda );
}
/* ====================================================================
Performs operation using MAGMA
=================================================================== */
/* distribute matrix to gpus */
//magma_zprint( N, N, h_A, lda );
//if ( opts.uplo == MagmaUpper) {
for (j = 0; j < N; j += nb) {
k = (j / nb) % ngpu;
magma_setdevice(k);
nk = min(nb, N - j);
magma_zsetmatrix( N, nk,
h_A + j * lda, lda,
d_lA[k] + j / (nb * ngpu) * nb * ldda, ldda);
}
//} else {
//}
gpu_time = magma_wtime();
//magma_zpotrf_mgpu(ngpu, opts.uplo, N, d_lA, ldda, &info);
magma_zpotrf_mgpu_right(ngpu, opts.uplo, N, d_lA, ldda, &info);
gpu_time = magma_wtime() - gpu_time;
if (info != 0) {
printf("magma_zpotrf_mgpu_right returned error %lld: %s.\n",
(long long) info, magma_strerror( info ));
}
gpu_perf = gflops / gpu_time;
if ( opts.check && info == 0) {
/* =====================================================================
Performs operation using LAPACK
=================================================================== */
cpu_time = magma_wtime();
lapackf77_zpotrf( lapack_uplo_const(opts.uplo), &N, h_A, &lda, &info );
//printf( " ==== LAPACK ====\n" );
//magma_zprint( N, N, h_A, lda );
cpu_time = magma_wtime() - cpu_time;
cpu_perf = gflops / cpu_time;
if (info != 0) {
printf("lapackf77_zpotrf returned error %lld: %s.\n",
(long long) info, magma_strerror( info ));
}
/* =====================================================================
Check the result compared to LAPACK
=================================================================== */
/* gather matrix from gpus */
//if ( opts.uplo == MagmaUpper ) {
for (j = 0; j < N; j += nb) {
k = (j / nb) % ngpu;
magma_setdevice(k);
nk = min(nb, N - j);
magma_zgetmatrix( N, nk,
d_lA[k] + j / (nb * ngpu) * nb * ldda, ldda,
h_R + j * lda, lda );
}
/*} else {
}*/
magma_setdevice(0);
//printf( " ==== MAGMA ====\n" );
//magma_zprint( N, N, h_R, lda );
error = safe_lapackf77_zlanhe("f", "L", &N, h_A, &lda, work);
blasf77_zaxpy(&n2, &c_neg_one, h_A, &ione, h_R, &ione);
Anorm = safe_lapackf77_zlanhe("f", "L", &N, h_A, &lda, work);
error = safe_lapackf77_zlanhe("f", "L", &N, h_R, &lda, work)
/ Anorm;
printf("%5lld %7.2f (%7.2f) %7.2f (%7.2f) %8.2e\n",
(long long) N, cpu_perf, cpu_time, gpu_perf, gpu_time, error );
}
else {
printf("%5lld --- ( --- ) %7.2f (%7.2f) --- \n",
(long long) N, gpu_perf, gpu_time );
}
for (j = 0; j < ngpu; j++) {
magma_setdevice(j);
magma_free( d_lA[j] );
}
magma_setdevice(0);
magma_free_cpu( h_A );
magma_free_pinned( h_R );
fflush( stdout );
}
if ( opts.niter > 1 ) {
printf( "\n" );
}
}
opts.cleanup();
TESTING_CHECK( magma_finalize() );
return 0;
}
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