sgemm_sizing.h

Nividia提供的CUDA的BLAS库源码

/*
 * Copyright 1993-2008 NVIDIA Corporation.  All rights reserved.
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#if !defined(THREAD_COUNT) || !defined(TILE_DIM_LOG)
#error THREAD_COUNT and TILE_DIM_LOG must be defined
#endif

// dimension m, counter i
// dimension n, counter j
// dimension k, counter l

#if (CUBLAS_SGEMM_GRIDW!=CUBLAS_SGEMM_GRIDH)
#error super tile is not square!
#endif

#define TILE_DIM        (1 << (TILE_DIM_LOG))
#define TILE_SIZE       (TILE_DIM*TILE_DIM)
#define SUP_TILE_DIM    (TILE_DIM*CUBLAS_SGEMM_GRIDW)

/* In cases where there are more tile elements than threads in a CTA, each
 * thread needs to walk through the tile. To keep the walking pattern simple,
 * we make sure that the number of threads is an integral multiple of the
 * number of elements (i.e. each thread deals with exactly the same number
 * of elements), and that tile dimension (number of rows / number of columns)
 * divides the thread count without remainder. After assigning an initial
 * element to each thread, the thread can then access further elements by 
 * remaining in the same tile row and merely stepping through columns that
 * are COL_INCR apart.
 */
#if ((TILE_SIZE%THREAD_COUNT)!=0)
#error TILE_SIZE and THREAD_COUNT do not divide evenly!
#endif
#if ((THREAD_COUNT%TILE_DIM)!=0)
#error THREAD_COUNT and TILE_DIM do not divide evenly!
#endif

#define COL_INCR               (THREAD_COUNT/TILE_DIM)
#define C_ELEMS_PER_THREAD     (TILE_SIZE/THREAD_COUNT)
#define A_ELEMS_PER_THREAD     (TILE_SIZE/THREAD_COUNT)
#define B_ELEMS_PER_THREAD     (TILE_SIZE/THREAD_COUNT)