[Profiler] Allow user to flush L2 cache in time_evalutor function for profiling CUDA kernels

3rdparty/nvbench/l2_cache_flush.h

@@ -0,0 +1,74 @@
+/*
+ *  Copyright 2021 NVIDIA Corporation
+ *
+ *  Licensed under the Apache License, Version 2.0 with the LLVM exception
+ *  (the "License"); you may not use this file except in compliance with
+ *  the License.
+ *
+ *  You may obtain a copy of the License at
+ *
+ *      http://llvm.org/foundation/relicensing/LICENSE.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ * \file l2_cache_flush.h
+ * \brief Functions to flush L2 cache using CUDA's API, adopted from nvbench.
+ */
+#ifndef L2_CACHE_FLUSH_H_
+#define L2_CACHE_FLUSH_H_
+
+#include <cuda.h>
+#include <cuda_runtime.h>
+#include <dmlc/logging.h>
+
+namespace tvm {
+namespace runtime {
+
+#define CUDA_CALL(func)                                       \
+  {                                                           \
+    cudaError_t e = (func);                                   \
+    ICHECK(e == cudaSuccess || e == cudaErrorCudartUnloading) \
+        << "CUDA: " << cudaGetErrorString(e);                 \
+  }
+
+class L2Flush {
+ public:
+  L2Flush() : initialized_(false), l2_size_(0), l2_buffer_(nullptr) {}
+
+  ~L2Flush() {
+    if (l2_size_ > 0) {
+      CUDA_CALL(cudaFree(l2_buffer_));
+    }
+  }
+
+  void Flush(cudaStream_t stream) {
+    if (!initialized_) {
+      // initialize l2_buffer_ and l2_size_
+      initialized_ = true;
+      int device_id;
+      CUDA_CALL(cudaGetDevice(&device_id));
+      CUDA_CALL(cudaDeviceGetAttribute(&l2_size_, cudaDevAttrL2CacheSize, device_id));
+      if (l2_size_ > 0) {
+        CUDA_CALL(cudaMalloc(reinterpret_cast<void**>(&l2_buffer_), l2_size_));
+      }
+    }
+    if (l2_size_ > 0) {
+      CUDA_CALL(cudaMemsetAsync(l2_buffer_, 0, l2_size_, stream));
+    }
+  }
+
+  static L2Flush* ThreadLocal();
+
+ private:
+  bool initialized_ = false;
+  int l2_size_;
+  int* l2_buffer_;
+};
+
+}  // namespace runtime
+}  // namespace tvm
+
+#endif  // L2_CACHE_FLUSH_H_

LICENSE

@@ -212,6 +212,7 @@ Apache Software Foundation License 2.0
 3rdparty/dlpack
 3rdparty/dmlc-core
 3rdparty/OpenCL-Headers
+3rdparty/nvbench (with LLVM exception)
 
 
 BSD 2-clause License
@@ -234,7 +235,6 @@ MIT License
 3rdparty/cma
 3rdparty/compiler-rt/builtin_fp16.h
 
-
 The Unlicense
 -------------
 

licenses/LICENSE.l2_cache_flush.txt

@@ -0,0 +1,218 @@
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src/runtime/cuda/l2_cache_flush.cc

@@ -0,0 +1,42 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+#include "../../../3rdparty/nvbench/l2_cache_flush.h"
+
+#include <dmlc/thread_local.h>
+#include <tvm/runtime/device_api.h>
+#include <tvm/runtime/registry.h>
+
+#include "cuda_common.h"
+
+namespace tvm {
+
+namespace runtime {
+
+typedef dmlc::ThreadLocalStore<L2Flush> L2FlushStore;
+
+L2Flush* L2Flush::ThreadLocal() { return L2FlushStore::Get(); }
+
+TVM_REGISTER_GLOBAL("l2_cache_flush_cuda").set_body([](TVMArgs args, TVMRetValue* rv) {
+  ICHECK(L2Flush::ThreadLocal() != nullptr) << "L2Flush::ThreadLocal do not exist.";
+  cudaStream_t stream = CUDAThreadEntry::ThreadLocal()->stream;
+  L2Flush::ThreadLocal()->Flush(stream);
+});
+
+}  // namespace runtime
+}  // namespace tvm