char-fork/llama.cpp

git clone https://git.t4t.associates/char-fork/llama.cpp

SXXggml: fix zero division in ‘dne’ calculation in CUDA COUNT_EQUAL operator when ‘ne’ is small (#10213)5b359bb1e

char/aliceai-t5-moe
brancheschar/aliceai-t5-moeall refs →
2.0 KiB64 linesraw
1#include "common.cuh"
2#include "count-equal.cuh"
3
4#include <cstdint>
5
6template <typename T>
7static __global__ void count_equal(const T * __restrict__ x, const T * __restrict__ y, int64_t * __restrict__ dst, const int64_t dk, const int64_t k) {
8    const int64_t i0 = (int64_t) blockIdx.x*dk;
9    const int64_t i1 = min(i0 + dk, k);
10
11    int nequal = 0;
12
13    for (int64_t i = i0 + threadIdx.x; i < i1; i += WARP_SIZE) {
14        const T xi = x[i];
15        const T yi = y[i];
16        nequal += xi == yi;
17    }
18
19    nequal = warp_reduce_sum(nequal);
20
21    if (threadIdx.x != 0) {
22        return;
23    }
24
25    atomicAdd((int *) dst, nequal);
26}
27
28void ggml_cuda_count_equal(ggml_backend_cuda_context & ctx, ggml_tensor * dst) {
29    const ggml_tensor * src0 = dst->src[0];
30    const ggml_tensor * src1 = dst->src[1];
31
32    GGML_ASSERT(src0->type == src1->type);
33    GGML_ASSERT( dst->type == GGML_TYPE_I64);
34
35    GGML_ASSERT(ggml_are_same_shape(src0, src1));
36    GGML_ASSERT(ggml_is_contiguous(src0));
37    GGML_ASSERT(ggml_is_contiguous(src1));
38    GGML_ASSERT(ggml_is_contiguous(dst));
39
40    int64_t * dst_d  = (int64_t *) dst->data;
41
42    cudaStream_t stream = ctx.stream();
43    const int nsm = ggml_cuda_info().devices[ggml_cuda_get_device()].nsm;
44
45    const int64_t ne = ggml_nelements(src0);
46    GGML_ASSERT(ne < (1 << 30) && "atomicAdd implementation only supports int");
47    const int64_t dne = GGML_PAD((ne + 4*nsm - 1) / (4*nsm), CUDA_COUNT_EQUAL_CHUNK_SIZE);
48
49    CUDA_CHECK(cudaMemsetAsync(dst_d, 0, ggml_nbytes(dst), stream));
50
51    const dim3 blocks_dim(WARP_SIZE, 1, 1);
52    const dim3 blocks_num(std::min((int64_t)4*nsm, (ne + CUDA_COUNT_EQUAL_CHUNK_SIZE - 1)/CUDA_COUNT_EQUAL_CHUNK_SIZE), 1, 1);
53
54    switch (src0->type) {
55        case GGML_TYPE_I32: {
56            const int * src0_d = (const int *) src0->data;
57            const int * src1_d = (const int *) src1->data;
58            count_equal<<<blocks_num, blocks_dim, 0, stream>>>(src0_d, src1_d, dst_d, dne, ne);
59        } break;
60        default:
61            GGML_ASSERT(false);
62            break;
63    }
64}