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/*
* SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
* SPDX-License-Identifier: Apache-2.0
*
* Licensed 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.
*/
/** @file cuda_graph.h
* @author Thomas Müller, NVIDIA
* @brief Implementation of a CUDA graph capture/update with subsequent execution
*/
#pragma once
#include <tiny-cuda-nn/common_host.h>
#include <cuda.h>
#include <deque>
#include <functional>
namespace tcnn {
class CudaGraph;
inline std::deque<CudaGraph*>& current_captures() {
static thread_local std::deque<CudaGraph*> s_current_captures;
return s_current_captures;
}
inline CudaGraph* current_capture() {
return current_captures().empty() ? nullptr : current_captures().front();
}
class CudaGraph {
public:
~CudaGraph() {
try {
reset();
} catch (const std::runtime_error& error) {
// Don't need to report on destruction problems when the driver is shutting down.
if (std::string{error.what()}.find("driver shutting down") == std::string::npos) {
log_warning("Could not destroy cuda graph: {}", error.what());
}
}
}
ScopeGuard capture_guard(cudaStream_t stream) {
// Can't capture on the global stream
if (stream == nullptr || stream == cudaStreamLegacy) {
return {};
}
// If the caller is already capturing, no need for a nested capture.
cudaStreamCaptureStatus capture_status;
CUDA_CHECK_THROW(cudaStreamIsCapturing(stream, &capture_status));
if (capture_status != cudaStreamCaptureStatusNone) {
return {};
}
cudaError_t capture_result = cudaStreamIsCapturing(cudaStreamLegacy, &capture_status);
if (capture_result == cudaErrorStreamCaptureImplicit) {
return {};
}
CUDA_CHECK_THROW(capture_result);
if (capture_status != cudaStreamCaptureStatusNone) {
return {};
}
// Start capturing
if (m_graph) {
CUDA_CHECK_THROW(cudaGraphDestroy(m_graph));
m_graph = nullptr;
}
CUDA_CHECK_THROW(cudaStreamBeginCapture(stream, cudaStreamCaptureModeRelaxed));
current_captures().push_back(this);
// Stop capturing again once the returned object goes out of scope
return ScopeGuard{[this, stream]() {
CUDA_CHECK_THROW(cudaStreamEndCapture(stream, &m_graph));
if (current_captures().back() != this) {
throw std::runtime_error{"CudaGraph: must end captures in reverse order of creation."};
}
current_captures().pop_back();
if (m_synchronize_when_capture_done) {
CUDA_CHECK_THROW(cudaDeviceSynchronize());
m_synchronize_when_capture_done = false;
}
// Capture failed for some reason. Reset state and don't execute anything.
// A corresponding exception is likely already in flight.
if (!m_graph) {
if (m_graph_instance) {
CUDA_CHECK_THROW(cudaGraphExecDestroy(m_graph_instance));
}
m_graph = nullptr;
m_graph_instance = nullptr;
return;
}
// If we previously created a graph instance, try to update it with the newly captured graph.
// This is cheaper than creating a new instance from scratch (and may involve just updating
// pointers rather than changing the topology of the graph.)
if (m_graph_instance) {
#if CUDA_VERSION >= 12000
cudaGraphExecUpdateResultInfo update_result;
CUDA_CHECK_THROW(cudaGraphExecUpdate(m_graph_instance, m_graph, &update_result));
// If the update failed, reset graph instance. We will create a new one next.
if (update_result.result != cudaGraphExecUpdateSuccess) {
CUDA_CHECK_THROW(cudaGraphExecDestroy(m_graph_instance));
m_graph_instance = nullptr;
}
#else
cudaGraphExecUpdateResult update_result;
cudaGraphNode_t error_node;
CUDA_CHECK_THROW(cudaGraphExecUpdate(m_graph_instance, m_graph, &error_node, &update_result));
// If the update failed, reset graph instance. We will create a new one next.
if (update_result != cudaGraphExecUpdateSuccess) {
CUDA_CHECK_THROW(cudaGraphExecDestroy(m_graph_instance));
m_graph_instance = nullptr;
}
#endif
}
if (!m_graph_instance) {
CUDA_CHECK_THROW(cudaGraphInstantiate(&m_graph_instance, m_graph, NULL, NULL, 0));
}
CUDA_CHECK_THROW(cudaGraphLaunch(m_graph_instance, stream));
}};
}
void reset() {
if (m_graph) {
CUDA_CHECK_THROW(cudaGraphDestroy(m_graph));
m_graph = nullptr;
}
if (m_graph_instance) {
CUDA_CHECK_THROW(cudaGraphExecDestroy(m_graph_instance));
m_graph_instance = nullptr;
}
}
void schedule_synchronize() {
m_synchronize_when_capture_done = true;
}
private:
cudaGraph_t m_graph = nullptr;
cudaGraphExec_t m_graph_instance = nullptr;
bool m_synchronize_when_capture_done = false;
};
}
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