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Add multithreading support for Haswell DDOT 

copied from ashwinyes' implementation in dot_thunderx2t99.c
This commit is contained in:
Martin Kroeker 2018-03-16 16:58:47 +01:00 committed by GitHub
parent 0ab5bf1746
commit 85a41e9cdb
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 67 additions and 1 deletions
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68
kernel/x86_64/ddot.c
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@ -43,6 +43,12 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "ddot_microk_sandy-2.c"
#endif
#if !defined(DSDOT)
#define RETURN_TYPE FLOAT
#else
#define RETURN_TYPE double
#endif
#ifndef HAVE_KERNEL_8
@ -71,7 +77,7 @@ static void ddot_kernel_8(BLASLONG n, FLOAT *x, FLOAT *y, FLOAT *d)
#endif
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
FLOAT dot_compute(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
BLASLONG i=0;
BLASLONG ix=0,iy=0;
@ -139,4 +145,64 @@ FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
}
#if defined(SMP)
static int dot_thread_function(BLASLONG n, BLASLONG dummy0,
BLASLONG dummy1, FLOAT dummy2, FLOAT *x, BLASLONG inc_x, FLOAT *y,
BLASLONG inc_y, RETURN_TYPE *result, BLASLONG dummy3)
{
*(RETURN_TYPE *)result = dot_compute(n, x, inc_x, y, inc_y);
return 0;
}
extern int blas_level1_thread_with_return_value(int mode, BLASLONG m, BLASLONG n,
BLASLONG k, void *alpha, void *a, BLASLONG lda, void *b, BLASLONG ldb,
void *c, BLASLONG ldc, int (*function)(), int nthreads);
#endif
FLOAT CNAME(BLASLONG n, FLOAT *x, BLASLONG inc_x, FLOAT *y, BLASLONG inc_y)
{
#if defined(SMP)
int nthreads;
FLOAT dummy_alpha;
#endif
FLOAT dot = 0.0;
#if defined(SMP)
nthreads = num_cpu_avail(1);
if (inc_x == 0 || inc_y == 0)
nthreads = 1;
if (n <= 10000)
nthreads = 1;
if (nthreads == 1) {
dot = dot_compute(n, x, inc_x, y, inc_y);
} else {
int mode, i;
char result[MAX_CPU_NUMBER * sizeof(double) * 2];
RETURN_TYPE *ptr;
#if !defined(DOUBLE)
mode = BLAS_SINGLE | BLAS_REAL;
#else
mode = BLAS_DOUBLE | BLAS_REAL;
#endif
fprintf(stderr,"threaded ddot with %d threads\n",nthreads);
blas_level1_thread_with_return_value(mode, n, 0, 0, &dummy_alpha,
x, inc_x, y, inc_y, result, 0,
( void *)dot_thread_function, nthreads);
ptr = (RETURN_TYPE *)result;
for (i = 0; i < nthreads; i++) {
dot = dot + (*ptr);
ptr = (RETURN_TYPE *)(((char *)ptr) + sizeof(double) * 2);
}
}
#else
dot = dot_compute(n, x, inc_x, y, inc_y);
#endif
return dot;
}