wehub-resource-sync
43 lines
1.7 KiB
C++
43 lines
1.7 KiB
C++
/*
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* SPDX-FileCopyrightText: Copyright (c) 2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TRT_GLOBAL_TIMER_KERNEL_H
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#define TRT_GLOBAL_TIMER_KERNEL_H
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#include <cstdint>
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#include <cuda_runtime_api.h>
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namespace sample
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{
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//! Launch a single-thread kernel that writes the current value of the PTX
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//! %globaltimer register (GPU timer in ns) to \p dTimestamp on \p stream.
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//!
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//! Used as a replacement for cudaEventElapsedTime() when Confidential Compute
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//! is enabled, where cudaEventElapsedTime() is documented to be unreliable.
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//!
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//! \param dTimestamp Device pointer to a uint64_t. Must be non-null and point
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//! to valid device memory reachable from \p stream.
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//! \param stream CUDA stream on which to launch the kernel.
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//! \return Result of \c cudaGetLastError() after the launch. This reports
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//! synchronous launch errors only; asynchronous execution errors will
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//! surface on a subsequent \c cudaEventRecord /
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//! \c cudaStreamSynchronize / similar.
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[[nodiscard]] cudaError_t launchGlobalTimerKernel(uint64_t* dTimestamp, cudaStream_t stream) noexcept;
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} // namespace sample
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#endif // TRT_GLOBAL_TIMER_KERNEL_H
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