better solution for p0 computation

ggml-org · Sep 18, 2023 · 3d4f991 · 3d4f991
1 parent eec6b66
commit 3d4f991
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Showing 2 changed files with 25 additions and 8 deletions.
diff --git a/ggml-cuda.cu b/ggml-cuda.cu
@@ -440,6 +440,7 @@ static cudaStream_t g_cudaStreams[GGML_CUDA_MAX_DEVICES][MAX_STREAMS] = { nullpt
 struct ggml_tensor_extra_gpu {
     void * data_device[GGML_CUDA_MAX_DEVICES]; // 1 pointer for each device for split tensors
     cudaEvent_t events[GGML_CUDA_MAX_DEVICES][MAX_STREAMS]; // events for synchronizing multiple GPUs
+    bool copied;
 };
 
 // this is faster on Windows
@@ -4356,6 +4357,14 @@ static __global__ void cpy_f32_f16(const char * cx, char * cdst, const int ne,
 }
 
 // rope == RoPE == rotary positional embedding
+static __global__ void compute_rope_p0(const int32_t * pos, float * p0, int n, int mode, float freq_scale) {
+    int i = blockIdx.x * blockDim.x + threadIdx.x;
+    if (i < n) {
+        int p = pos[i];
+        p0[i] = (((mode & 1) == 0 ? p : 0)) * freq_scale;
+    }
+}
+
 static __global__ void rope_f32(const float * x, float * dst, const int ncols, const float * p0,
                                 const float p_delta, const int p_delta_rows, const float theta_scale) {
     const int col = 2*(blockDim.y*blockIdx.y + threadIdx.y);
@@ -6091,18 +6100,20 @@ inline void ggml_cuda_op_rope(
 
     GGML_ASSERT(src1->type == GGML_TYPE_I32);
     GGML_ASSERT(src1->ne[0] == ne2);
+    GGML_ASSERT(src1->backend == GGML_BACKEND_GPU);
 
-    std::vector<float> p0s(ne2);
-    for (int64_t i = 0; i < ne2; ++i) {
-        int n_past = ((int32_t *) src1->data)[i];
-        p0s[i] = (((mode & 1) == 0 ? n_past : 0)) * freq_scale;
+    int id;
+    CUDA_CHECK(cudaGetDevice(&id));
+
+    struct ggml_tensor_extra_gpu * src1_extra = (ggml_tensor_extra_gpu *) src1->extra;
+    if (!src1_extra->copied) {
+        CUDA_CHECK(cudaMemcpyAsync(src1_extra->data_device[id], src1->data, ggml_nbytes(src1), cudaMemcpyHostToDevice, main_stream));
+        src1_extra->copied = true;
     }
 
     size_t p0d_as = 0;
-    float * p0d;
-
-    p0d = (float *) ggml_cuda_pool_malloc(ne2 * sizeof(float), &p0d_as);
-    CUDA_CHECK(cudaMemcpyAsync(p0d, p0s.data(), ne2 * sizeof(float), cudaMemcpyHostToDevice, main_stream));
+    float * p0d = (float *) ggml_cuda_pool_malloc(ne2 * sizeof(float), &p0d_as);
+    compute_rope_p0<<<(ne2 + CUDA_ROPE_BLOCK_SIZE - 1) / CUDA_ROPE_BLOCK_SIZE, CUDA_ROPE_BLOCK_SIZE, 0, main_stream>>>((int32_t*)src1_extra->data_device[id], p0d, ne2, mode, freq_scale);
 
     const bool is_neox = mode & 2;
     const bool is_glm  = mode & 4;

diff --git a/llama.cpp b/llama.cpp
@@ -2705,6 +2705,7 @@ static struct ggml_cgraph * llm_build_llama(
 
     // KQ_pos - contains the positions
     struct ggml_tensor * KQ_pos = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_tokens);
+    offload_func_kq(KQ_pos);
     ggml_allocr_alloc(lctx.alloc, KQ_pos);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) KQ_pos->data;
@@ -2715,6 +2716,7 @@ static struct ggml_cgraph * llm_build_llama(
 
     // K_shift
     struct ggml_tensor * K_shift = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_ctx);
+    offload_func_kq(K_shift);
     ggml_allocr_alloc(lctx.alloc, K_shift);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) K_shift->data;
@@ -3087,6 +3089,7 @@ static struct ggml_cgraph * llm_build_baichaun(
 
     // KQ_pos - contains the positions
     struct ggml_tensor * KQ_pos = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_tokens);
+    offload_func_kq(KQ_pos);
     ggml_allocr_alloc(lctx.alloc, KQ_pos);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) KQ_pos->data;
@@ -3097,6 +3100,7 @@ static struct ggml_cgraph * llm_build_baichaun(
 
     // K_shift
     struct ggml_tensor * K_shift = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_ctx);
+    offload_func_kq(K_shift);
     ggml_allocr_alloc(lctx.alloc, K_shift);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) K_shift->data;
@@ -3486,6 +3490,7 @@ static struct ggml_cgraph * llm_build_falcon(
 
     // KQ_pos - contains the positions
     struct ggml_tensor * KQ_pos = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_tokens);
+    offload_func_kq(KQ_pos);
     ggml_allocr_alloc(lctx.alloc, KQ_pos);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) KQ_pos->data;
@@ -3496,6 +3501,7 @@ static struct ggml_cgraph * llm_build_falcon(
 
     // K_shift
     struct ggml_tensor * K_shift = ggml_new_tensor_1d(ctx0, GGML_TYPE_I32, n_ctx);
+    offload_func_kq(K_shift);
     ggml_allocr_alloc(lctx.alloc, K_shift);
     if (!ggml_allocr_is_measure(lctx.alloc)) {
         int * data = (int *) K_shift->data;