perf(mgb/cuda): do not call cudaGetDeviceProperties to avoid io traffic

GitOrigin-RevId: 6aa35928c8ec737d244fdb3ca9639ae49b03b284

dnn/src/cuda/topk/opr_impl.cpp

@@ -22,20 +22,25 @@ template <typename ctype>
 void TopKImpl::dispatch_with_ctype(int k, size_t m, size_t n, ptrdiff_t lda,
                                    const ctype* data, ctype* values,
                                    int* indices, void* workspace) {
-    auto stream = concrete_handle(handle())->stream();
+    auto _handle = concrete_handle(handle());
+    auto stream = _handle->stream();
+    size_t grid_dim_y_limit = _handle->device_prop().maxGridSize[1];
     switch (param().mode) {
         case Param::Mode::KTH_ONLY:
             cuda_check(topk::find_kth_radix<ctype>(data, values, workspace, m,
-                                                   n, lda, k, stream));
+                                                   n, lda, k, grid_dim_y_limit,
+                                                   stream));
             return;
         case Param::Mode::VALUE_IDX_NOSORT: {
             WorkspaceBundle wk_bundle{workspace, {m * sizeof(ctype), 1}};
             auto thresh = static_cast<ctype*>(wk_bundle.get(0));
             auto real_wk = wk_bundle.get(1);
             cuda_check(topk::find_kth_radix<ctype>(data, thresh, real_wk, m, n,
-                                                   lda, k, stream));
+                                                   lda, k, grid_dim_y_limit,
+                                                   stream));
             cuda_check(topk::topk_select<ctype>(data, thresh, values, indices,
-                                                real_wk, m, n, lda, k, stream));
+                                                real_wk, m, n, lda, k,
+                                                grid_dim_y_limit, stream));
             return;
         }
         case Param::Mode::VALUE_IDX_SORTED: {
@@ -48,10 +53,11 @@ void TopKImpl::dispatch_with_ctype(int k, size_t m, size_t n, ptrdiff_t lda,
             auto nosort_idx = static_cast<int32_t*>(wk_bundle.get(2));
             auto real_wk = wk_bundle.get(3);
             cuda_check(topk::find_kth_radix<ctype>(data, thresh, real_wk, m, n,
-                                                   lda, k, stream));
+                                                   lda, k, grid_dim_y_limit,
+                                                   stream));
             cuda_check(topk::topk_select<ctype>(data, thresh, nosort_values,
                                                 nosort_idx, real_wk, m, n, lda,
-                                                k, stream));
+                                                k, grid_dim_y_limit, stream));
             argsort::forward(nosort_values, values, indices, real_wk, m,
                              std::abs(k), k > 0, stream, nosort_idx);
             return;
@@ -89,9 +95,11 @@ size_t TopKImpl::get_workspace_in_bytes(int k, const TensorLayout& data,
     MEGDNN_MARK_USED_VAR(indices);
     size_t m = data[0], n = data[1];
     size_t kabs = std::abs(k);
+    size_t grid_dim_y_limit =
+            concrete_handle(handle())->device_prop().maxGridSize[1];
     megdnn_assert(std::max(m, n) <=
                   static_cast<size_t>(std::numeric_limits<int>::max()));
-    size_t kth = topk::find_kth_radix_workspace(m, n),
+    size_t kth = topk::find_kth_radix_workspace(m, n, grid_dim_y_limit),
            sel = topk::topk_select_workspace(m, n);
     auto ctsize = data.dtype.size();
     switch (param().mode) {

dnn/src/cuda/topk/topk_radix.cu

@@ -468,17 +468,9 @@ static size_t get_scan_workspace(uint32_t size) {
 }  // namespace select
 }  // namespace cuda_topk_impl
 
-uint32_t topk::find_kth_radix_workspace(uint32_t batch, uint32_t length) {
+uint32_t topk::find_kth_radix_workspace(uint32_t batch, uint32_t length,
+                                        uint32_t grid_dim_y_limit) {
     using namespace cuda_topk_impl::kth;
-    int device_id;
-    if (cudaGetDevice(&device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    cudaDeviceProp prop;
-    if (cudaGetDeviceProperties(&prop, device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    uint32_t grid_dim_y_limit = prop.maxGridSize[1];
     uint32_t limit = batch > grid_dim_y_limit ? grid_dim_y_limit : batch;
     return (limit * get_grid_dim_x(length) * NR_BUCKET + limit * 2) *
            sizeof(uint32_t);
@@ -488,6 +480,7 @@ template <typename ctype>
 cudaError_t topk::find_kth_radix(const ctype* input, ctype* output,
                                  void* workspace, uint32_t batch,
                                  uint32_t length, int32_t lda, int32_t k,
+                                 uint32_t grid_dim_y_limit,
                                  cudaStream_t stream) {
     using namespace cuda_topk_impl::kth;
     if (!k) {
@@ -502,16 +495,6 @@ cudaError_t topk::find_kth_radix(const ctype* input, ctype* output,
         megdnn_trap();
     }
 
-    int device_id;
-    if (cudaGetDevice(&device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    cudaDeviceProp prop;
-    if (cudaGetDeviceProperties(&prop, device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    uint32_t grid_dim_y_limit = prop.maxGridSize[1];
-
     uint32_t batch_idx = 0;
     uint32_t grid_dim_x = get_grid_dim_x(length);
     uint32_t grid_dim_y = 1;
@@ -567,20 +550,11 @@ template <typename ctype>
 cudaError_t topk::topk_select(const ctype* input, const ctype* thresh,
                               ctype* output_value, int32_t* output_idx,
                               void* workspace, uint32_t batch, uint32_t length,
-                              int32_t lda, int32_t k, cudaStream_t stream) {
+                              int32_t lda, int32_t k,
+                              uint32_t batch_upper_limit, cudaStream_t stream) {
     using namespace cuda_topk_impl;
     using namespace cuda_topk_impl::select;
 
-    int device_id;
-    if (cudaGetDevice(&device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    cudaDeviceProp prop;
-    if (cudaGetDeviceProperties(&prop, device_id) != cudaSuccess) {
-        megdnn_trap();
-    }
-    uint32_t batch_upper_limit = prop.maxGridSize[1];
-
     uint32_t length_split = DIVUP(length, REDUCE_SIZE);
 
     void (*kptr_reduce_block_cnt)(const ctype*, const ctype*, uint32_t, int32_t,
@@ -688,10 +662,10 @@ namespace topk {
 #define INST(t)                                                             \
     template cudaError_t find_kth_radix<t>(const t*, t*, void*, uint32_t,   \
                                            uint32_t, int32_t, int32_t,      \
-                                           cudaStream_t);                   \
+                                           uint32_t, cudaStream_t);         \
     template cudaError_t topk_select<t>(const t*, const t*, t*, int32_t*,   \
                                         void*, uint32_t, uint32_t, int32_t, \
-                                        int32_t, cudaStream_t)
+                                        int32_t, uint32_t, cudaStream_t)
 INST(float);
 INST(int32_t);
 #undef INST

dnn/src/cuda/topk/topk_radix.cuh

@@ -76,10 +76,12 @@ struct RadixConverter<int32_t> {
 template <typename ctype>
 cudaError_t find_kth_radix(const ctype* input, ctype* output, void* workspace,
                            uint32_t batch, uint32_t length, int32_t lda,
-                           int32_t k, cudaStream_t stream);
+                           int32_t k, uint32_t grid_dim_y_limit,
+                           cudaStream_t stream);
 
 //! get workspace in bytes
-uint32_t find_kth_radix_workspace(uint32_t batch, uint32_t length);
+uint32_t find_kth_radix_workspace(uint32_t batch, uint32_t length,
+                                  uint32_t grid_dim_y_limit);
 
 /*!
  * \brief select values from rows of input that compare to thresh as specified
@@ -90,7 +92,8 @@ template <typename ctype>
 cudaError_t topk_select(const ctype* input, const ctype* thresh,
                         ctype* output_value, int32_t* output_idx,
                         void* workspace, uint32_t batch, uint32_t length,
-                        int32_t lda, int32_t k, cudaStream_t stream);
+                        int32_t lda, int32_t k, uint32_t batch_upper_limit,
+                        cudaStream_t stream);
 
 uint32_t topk_select_workspace(uint32_t batch, uint32_t length);