108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
/***************************************************************************************************
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* Copyright (c) 2017-2021, NVIDIA CORPORATION. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification, are permitted
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* provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright notice, this list of
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* conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright notice, this list of
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* conditions and the following disclaimer in the documentation and/or other materials
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* provided with the distribution.
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* * Neither the name of the NVIDIA CORPORATION nor the names of its contributors may be used
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* to endorse or promote products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL NVIDIA CORPORATION BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TOR (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************************************/
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/* \file
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\brief Defines a math function
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*/
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#include <stdexcept>
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#include "gpu_timer.h"
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namespace cutlass {
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namespace profiler {
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/////////////////////////////////////////////////////////////////////////////////////////////////
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GpuTimer::GpuTimer() {
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cudaError_t result;
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for (auto & event : events) {
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result = cudaEventCreate(&event);
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to create CUDA event");
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}
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}
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}
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GpuTimer::~GpuTimer() {
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for (auto & event : events) {
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cudaEventDestroy(event);
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}
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}
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/// Records a start event in the stream
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void GpuTimer::start(cudaStream_t stream) {
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cudaError_t result = cudaEventRecord(events[0], stream);
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to record start event.");
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}
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}
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/// Records a stop event in the stream
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void GpuTimer::stop(cudaStream_t stream) {
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cudaError_t result = cudaEventRecord(events[1], stream);
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to record stop event.");
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}
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}
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/// Records a stop event in the stream and synchronizes on the stream
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void GpuTimer::stop_and_wait(cudaStream_t stream) {
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stop(stream);
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cudaError_t result;
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if (stream) {
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result = cudaStreamSynchronize(stream);
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to synchronize with non-null CUDA stream.");
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}
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}
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else {
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result = cudaDeviceSynchronize();
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to synchronize with CUDA device.");
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}
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}
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}
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/// Returns the duration in miliseconds
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double GpuTimer::duration(int iterations) const {
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float avg_ms;
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cudaError_t result = cudaEventElapsedTime(&avg_ms, events[0], events[1]);
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if (result != cudaSuccess) {
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throw std::runtime_error("Failed to query elapsed time from CUDA events.");
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}
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return double(avg_ms) / double(iterations);
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}
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/////////////////////////////////////////////////////////////////////////////////////////////////
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} // namespace profiler
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} // namespace cutlass
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