Istvan Kiss
197f73dac9
* Add examples to tools folder * Correct P2P memory access section * Sync poriting guide * Add HIP Graph tutorial * Add hint about using amdgpu-dkms for IPC API * Add a few more env variables
110 خطوط
4.0 KiB
Plaintext
110 خطوط
4.0 KiB
Plaintext
// MIT License
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//
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// Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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// [sphinx-start]
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#include <hip/hip_runtime.h>
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#include <cstddef>
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#include <iostream>
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#define HIP_CHECK(expression) \
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{ \
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const hipError_t status = expression; \
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if (status != hipSuccess) \
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{ \
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std::cerr << "HIP error " << status \
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<< ": " << hipGetErrorString(status) \
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<< " at " << __FILE__ << ":" \
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<< __LINE__ << std::endl; \
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std::exit(EXIT_FAILURE); \
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} \
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}
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// Kernel to perform some computation on allocated memory.
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__global__ void myKernel(int* data, std::size_t numElements)
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{
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int tid = threadIdx.x + blockIdx.x * blockDim.x;
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if (tid < numElements)
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{
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data[tid] = tid * 2;
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}
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}
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int main()
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{
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// Create a stream.
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hipStream_t stream;
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HIP_CHECK(hipStreamCreate(&stream));
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// Create a memory pool with default properties.
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hipMemPoolProps poolProps = {};
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poolProps.allocType = hipMemAllocationTypePinned;
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poolProps.handleTypes = hipMemHandleTypePosixFileDescriptor;
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poolProps.location.type = hipMemLocationTypeDevice;
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poolProps.location.id = 0; // Assuming device 0.
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hipMemPool_t memPool;
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HIP_CHECK(hipMemPoolCreate(&memPool, &poolProps));
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// Allocate memory from the pool asynchronously.
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constexpr std::size_t numElements = 1024;
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int* devData = nullptr;
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HIP_CHECK(hipMallocFromPoolAsync(reinterpret_cast<void**>(&devData),
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numElements * sizeof(*devData),
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memPool,
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stream));
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// Define grid and block sizes.
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dim3 blockSize(256);
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dim3 gridSize((numElements + blockSize.x - 1) / blockSize.x);
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// Launch the kernel to perform computation.
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myKernel<<<gridSize, blockSize, 0, stream>>>(devData, numElements);
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// Synchronize the stream.
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HIP_CHECK(hipStreamSynchronize(stream));
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// Copy data back to host.
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int* hostData = new int[numElements];
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HIP_CHECK(hipMemcpy(hostData, devData, numElements * sizeof(*devData), hipMemcpyDeviceToHost));
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// Print the array.
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for (std::size_t i = 0; i < numElements; ++i)
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std::cout << "Element " << i << ": " << hostData[i] << std::endl;
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// Free the allocated memory.
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HIP_CHECK(hipFreeAsync(devData, stream));
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// Synchronize the stream again to ensure all operations are complete.
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HIP_CHECK(hipStreamSynchronize(stream));
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// Destroy the memory pool and stream.
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HIP_CHECK(hipMemPoolDestroy(memPool));
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HIP_CHECK(hipStreamDestroy(stream));
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// Free host memory.
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delete[] hostData;
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return EXIT_SUCCESS;
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}
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// [sphinx-end]
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