wehub-resource-sync
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
/*
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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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#include "globalTimerKernel.h"
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namespace
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{
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__global__ void readGlobalTimerKernel(uint64_t* timestamp)
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{
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if (timestamp == nullptr)
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{
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return;
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}
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uint64_t ts;
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asm volatile("mov.u64 %0, %%globaltimer;" : "=l"(ts));
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*timestamp = ts;
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}
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} // namespace
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namespace sample
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{
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// NOTE: cudaGetLastError() only surfaces synchronous launch errors (invalid
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// configuration, bad stream, etc.). Any asynchronous execution errors from
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// the kernel itself — e.g. a dereference of a bad device pointer — will not
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// be reported here; they become visible only on a subsequent synchronization
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// point such as cudaEventRecord / cudaStreamSynchronize / cudaDeviceSynchronize.
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cudaError_t launchGlobalTimerKernel(uint64_t* dTimestamp, cudaStream_t stream) noexcept
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{
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readGlobalTimerKernel<<<1, 1, 0, stream>>>(dTimestamp);
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return cudaGetLastError();
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}
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} // namespace sample
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