vulkan: Reuse conversion results in prealloc_y (#15410)

* vulkan: Reuse conversion results in prealloc_y

Cache the pipeline and tensor that were most recently used to fill prealloc_y,
and skip the conversion if the current pipeline/tensor match.

* don't use shared pointer for prealloc_y_last_pipeline_used

ggml/src/ggml-vulkan/ggml-vulkan.cpp

@@ -1193,6 +1193,10 @@ struct ggml_backend_vk_context {
     vk::Fence fence, almost_ready_fence;
     bool almost_ready_fence_pending {};
 
+    // Cache most recent tensor that was converted into prealloc_y, and what pipeline it used to convert.
+    vk_pipeline_struct * prealloc_y_last_pipeline_used {};
+    const ggml_tensor * prealloc_y_last_tensor_used {};
+
     vk_buffer buffer_pool[MAX_VK_BUFFERS];
 
     vk_context_ref compute_ctx;
@@ -5651,10 +5655,20 @@ static void ggml_vk_mul_mat_q_f16(ggml_backend_vk_context * ctx, vk_context& sub
         ggml_vk_dispatch_pipeline(ctx, subctx, to_fp16_vk_0, { vk_subbuffer{ d_Qx, qx_buf_offset, qx_sz * ne02 * ne03 }, vk_subbuffer{ d_X, 0, x_sz * ne02 * ne03 } }, pc, { (uint32_t)(x_ne * ne02 * ne03), 1, 1});
     }
     if (y_non_contig) {
+        if (ctx->prealloc_y_last_pipeline_used != to_fp16_vk_1.get() ||
+            ctx->prealloc_y_last_tensor_used != src1) {
             ggml_vk_cpy_to_contiguous(ctx, subctx, to_fp16_vk_1, src1, { d_Qy, qy_buf_offset, VK_WHOLE_SIZE }, { d_Y, 0, VK_WHOLE_SIZE });
+            ctx->prealloc_y_last_pipeline_used = to_fp16_vk_1.get();
+            ctx->prealloc_y_last_tensor_used = src1;
+        }
     }
     if (quantize_y) {
+        if (ctx->prealloc_y_last_pipeline_used != to_q8_1.get() ||
+            ctx->prealloc_y_last_tensor_used != src1) {
             ggml_vk_quantize_q8_1(ctx, subctx, { d_Qy, qy_buf_offset, VK_WHOLE_SIZE }, { d_Y, 0, VK_WHOLE_SIZE }, y_ne * ne12 * ne13);
+            ctx->prealloc_y_last_pipeline_used = to_q8_1.get();
+            ctx->prealloc_y_last_tensor_used = src1;
+        }
     }
 
     uint32_t stride_batch_x = ne00*ne01;
@@ -5829,7 +5843,12 @@ static void ggml_vk_mul_mat_vec_q_f16(ggml_backend_vk_context * ctx, vk_context&
     }
     if (y_non_contig) {
         GGML_ASSERT(y_sz == ggml_type_size(src1->type) * y_ne);
+        if (ctx->prealloc_y_last_pipeline_used != to_fp16_vk_1.get() ||
+            ctx->prealloc_y_last_tensor_used != src1) {
             ggml_vk_cpy_to_contiguous(ctx, subctx, to_fp16_vk_1, src1, { d_Qy, qy_buf_offset, VK_WHOLE_SIZE }, { d_Y, 0, VK_WHOLE_SIZE });
+            ctx->prealloc_y_last_pipeline_used = to_fp16_vk_1.get();
+            ctx->prealloc_y_last_tensor_used = src1;
+        }
     }
 
     // For batch_n, the A matrix is the same for each batch, and B/D use the row stride as the batch stride
@@ -6259,7 +6278,12 @@ static void ggml_vk_mul_mat_id_q_f16(ggml_backend_vk_context * ctx, vk_context&
             { vk_subbuffer{ d_Qx, qx_buf_offset, qx_sz * ne02 * ne03 }, vk_subbuffer{ d_X, 0, x_sz * ne02 * ne03 } }, pc, { (uint32_t)(x_ne * ne02 * ne03), 1, 1});
     }
     if (y_non_contig) {
+        if (ctx->prealloc_y_last_pipeline_used != to_fp16_vk_1.get() ||
+            ctx->prealloc_y_last_tensor_used != src1) {
             ggml_vk_cpy_to_contiguous(ctx, subctx, to_fp16_vk_1, src1, { d_Qy, qy_buf_offset, VK_WHOLE_SIZE }, { d_Y, 0, VK_WHOLE_SIZE });
+            ctx->prealloc_y_last_pipeline_used = to_fp16_vk_1.get();
+            ctx->prealloc_y_last_tensor_used = src1;
+        }
     }
 
     uint32_t stride_batch_x = ne00*ne01;
@@ -6447,7 +6471,12 @@ static void ggml_vk_mul_mat_vec_id_q_f16(ggml_backend_vk_context * ctx, vk_conte
     }
     if (y_non_contig) {
         GGML_ASSERT(y_sz == ggml_type_size(src1->type) * y_ne);
+        if (ctx->prealloc_y_last_pipeline_used != to_fp16_vk_1.get() ||
+            ctx->prealloc_y_last_tensor_used != src1) {
             ggml_vk_cpy_to_contiguous(ctx, subctx, to_fp16_vk_1, src1, { d_Qy, qy_buf_offset, VK_WHOLE_SIZE }, { d_Y, 0, VK_WHOLE_SIZE });
+            ctx->prealloc_y_last_pipeline_used = to_fp16_vk_1.get();
+            ctx->prealloc_y_last_tensor_used = src1;
+        }
     }
 
     uint32_t stride_batch_y = ne10*ne11;
@@ -6491,6 +6520,9 @@ static void ggml_vk_mul_mat_id(ggml_backend_vk_context * ctx, vk_context& subctx
         GGML_ASSERT(nei0 <= 4096);
         const uint32_t split_size = std::min(nei1, 4096u / nei0);
 
+        if (split_size == nei1) {
+            ggml_vk_mul_mat_id_q_f16(ctx, subctx, src0, src1, src2, dst, dryrun);
+        } else {
             ggml_tensor src1_copy = *src1;
             ggml_tensor src2_copy = *src2;
             ggml_tensor dst_copy = *dst;
@@ -6507,6 +6539,10 @@ static void ggml_vk_mul_mat_id(ggml_backend_vk_context * ctx, vk_context& subctx
                 dst_copy.ne[2] = n_tokens;
 
                 ggml_vk_mul_mat_id_q_f16(ctx, subctx, src0, &src1_copy, &src2_copy, &dst_copy, dryrun);
+                // invalidate cached prealloc_y, can't cache based on the copy of the ggml_tensor
+                ctx->prealloc_y_last_pipeline_used = {};
+                ctx->prealloc_y_last_tensor_used = nullptr;
+            }
         }
     }
 }
@@ -10311,6 +10347,7 @@ static void ggml_vk_graph_cleanup(ggml_backend_vk_context * ctx) {
         ggml_vk_pool_free(ctx, buffer);
     }
     ctx->gc.temp_buffers.clear();
+    ctx->prealloc_y_last_pipeline_used = {};
 
     ggml_vk_command_pool_cleanup(ctx->device, ctx->compute_cmd_pool);
     ggml_vk_command_pool_cleanup(ctx->device, ctx->transfer_cmd_pool);
@@ -10346,6 +10383,7 @@ static void ggml_vk_cleanup(ggml_backend_vk_context * ctx) {
     ggml_vk_destroy_buffer(ctx->prealloc_x);
     ggml_vk_destroy_buffer(ctx->prealloc_y);
     ggml_vk_destroy_buffer(ctx->prealloc_split_k);
+    ctx->prealloc_y_last_pipeline_used = nullptr;
 
     for (auto& buffer : ctx->buffer_pool) {
         ggml_vk_destroy_buffer(buffer);
@@ -10894,6 +10932,9 @@ static ggml_status ggml_backend_vk_graph_compute(ggml_backend_t backend, ggml_cg
         compute_ctx->s->buffer.writeTimestamp(vk::PipelineStageFlagBits::eAllCommands, ctx->device->query_pool, 0);
     }
 
+    ctx->prealloc_y_last_pipeline_used = nullptr;
+    ctx->prealloc_y_last_tensor_used = nullptr;
+
     // Submit after enough work has accumulated, to overlap CPU cmdbuffer generation with GPU execution.
     // Estimate the amount of matmul work by looking at the weight matrix size, and submit every 100MB
     // (and scaled down based on model size, so smaller models submit earlier).

tests/test-backend-ops.cpp

@@ -3098,9 +3098,10 @@ struct test_mul_mat : public test_case {
     const std::array<int64_t, 2> nr;  // repeat in dims 3 and 4
     const std::array<int64_t, 4> per; // permutation of dimensions
     const bool v; // whether a and b are non-contiguous views
+    const uint32_t o; // number of outputs
 
     std::string vars() override {
-        return VARS_TO_STR9(type_a, type_b, m, n, k, bs, nr, per, v);
+        return VARS_TO_STR10(type_a, type_b, m, n, k, bs, nr, per, v, o);
     }
 
     double max_nmse_err() override {
@@ -3121,8 +3122,8 @@ struct test_mul_mat : public test_case {
             std::array<int64_t, 2> bs = {10, 10},
             std::array<int64_t, 2> nr = {2, 2},
             std::array<int64_t, 4> per = {0, 1, 2, 3},
-            bool v = false)
+            bool v = false, uint32_t o = 1)
-        : type_a(type_a), type_b(type_b), m(m), n(n), k(k), bs(bs), nr(nr), per(per), v(v) {}
+        : type_a(type_a), type_b(type_b), m(m), n(n), k(k), bs(bs), nr(nr), per(per), v(v), o(o) {}
 
     ggml_tensor * build_graph(ggml_context * ctx) override {
         // C^T = A * B^T: (k, m) * (k, n) => (m, n)
@@ -3186,9 +3187,21 @@ struct test_mul_mat : public test_case {
 
         ggml_tensor * out = ggml_mul_mat(ctx, a, b);
         ggml_set_name(out, "out");
+        for (uint32_t i = 1; i < o; ++i) {
+            ggml_tensor * out2 = ggml_mul_mat(ctx, a, b);
+            ggml_set_name(out2, "out2");
+            out = ggml_add(ctx, out, out2);
+        }
 
         return out;
     }
+
+    bool run_whole_graph() override { return o > 1; }
+
+    std::string op_desc(ggml_tensor * t) override {
+        GGML_UNUSED(t);
+        return ggml_op_name(GGML_OP_MUL_MAT);
+    }
 };
 
 // GGML_OP_MUL_MAT_ID
@@ -3201,9 +3214,10 @@ struct test_mul_mat_id : public test_case {
     const int64_t m;
     const int64_t n;
     const int64_t k;
+    const uint32_t o; // number of outputs
 
     std::string vars() override {
-        return VARS_TO_STR8(type_a, type_b, n_mats, n_used, b, m, n, k);
+        return VARS_TO_STR9(type_a, type_b, n_mats, n_used, b, m, n, k, o);
     }
 
     double max_nmse_err() override {
@@ -3217,9 +3231,9 @@ struct test_mul_mat_id : public test_case {
 
     test_mul_mat_id(ggml_type type_a = GGML_TYPE_F32, ggml_type type_b = GGML_TYPE_F32,
             int n_mats = 8, int n_used = 2, bool b = false,
-            int64_t m = 32, int64_t n = 32, int64_t k = 32)
+            int64_t m = 32, int64_t n = 32, int64_t k = 32, uint32_t o = 1)
         : type_a(type_a), type_b(type_b), n_mats(n_mats), n_used(n_used), b(b),
-            m(m), n(n), k(k) {
+            m(m), n(n), k(k), o(o) {
             GGML_ASSERT(n_used <= n_mats);
         }
 
@@ -3241,6 +3255,13 @@ struct test_mul_mat_id : public test_case {
         ggml_tensor * out = ggml_mul_mat_id(ctx, as, b, ids);
         ggml_set_name(out, "out");
 
+        for (uint32_t i = 1; i < o; ++i) {
+            ggml_tensor * a2 = ggml_new_tensor_3d(ctx, type_a, k, m, n_mats);
+            ggml_tensor * out2 = ggml_mul_mat_id(ctx, a2, b, ids);
+            ggml_set_name(out2, "out2");
+            out = ggml_add(ctx, out, out2);
+        }
+
         return out;
     }
 
@@ -3264,6 +3285,13 @@ struct test_mul_mat_id : public test_case {
             }
         }
     }
+
+    bool run_whole_graph() override { return o > 1; }
+
+    std::string op_desc(ggml_tensor * t) override {
+        GGML_UNUSED(t);
+        return ggml_op_name(GGML_OP_MUL_MAT_ID);
+    }
 };
 
 // GGML_OP_OUT_PROD
@@ -5798,6 +5826,7 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_eval() {
     test_cases.emplace_back(new test_mul_mat(GGML_TYPE_F16, GGML_TYPE_F32, 128, 45,  64, { 8,  1}, {4, 1}));
     test_cases.emplace_back(new test_mul_mat(GGML_TYPE_F16, GGML_TYPE_F32, 1056, 1, 193, {1,  1}, {4, 1}, {0, 2, 1, 3}));
     test_cases.emplace_back(new test_mul_mat(GGML_TYPE_F16, GGML_TYPE_F32, 1056, 1, 67,  {1,  1}, {4, 1}, {0, 2, 1, 3}));
+    test_cases.emplace_back(new test_mul_mat(GGML_TYPE_F32, GGML_TYPE_F32, 16, 32, 32, { 1,  1}, {1, 1}, {0, 1, 2, 3}, true, 3));
 
     for (auto bs2 : {1,3}) {
         for (auto bs : {1,2,4,8}) {
@@ -5826,6 +5855,7 @@ static std::vector<std::unique_ptr<test_case>> make_test_cases_eval() {
     }
 
     test_cases.emplace_back(new test_mul_mat_id(GGML_TYPE_F16, GGML_TYPE_F32, 1, 1, false, 8, 16, 1));
+    test_cases.emplace_back(new test_mul_mat_id(GGML_TYPE_F16, GGML_TYPE_F32, 16, 16, false, 32, 32, 32, 3));
 
     for (ggml_type type_a : base_types) {
         for (ggml_type type_b : {GGML_TYPE_F32 /*, GGML_TYPE_F16 */}) {