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
84 строки
2.8 KiB
Plaintext
84 строки
2.8 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 <iostream>
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#define HIP_CHECK(expression) \
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{ \
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const hipError_t err = expression; \
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if(err != hipSuccess) \
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{ \
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std::cerr << "HIP error: " \
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<< hipGetErrorString(err) \
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<< " at " << __LINE__ << "\n"; \
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} \
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}
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// Addition of two values.
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__global__ void add(int *a, int *b, int *c)
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{
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*c = *a + *b;
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}
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int main()
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{
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int *a, *b, *c;
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int deviceId;
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HIP_CHECK(hipGetDevice(&deviceId)); // Get the current device ID
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// Allocate memory for a, b and c that is accessible to both device and host codes.
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HIP_CHECK(hipMallocManaged(&a, sizeof(*a)));
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HIP_CHECK(hipMallocManaged(&b, sizeof(*b)));
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HIP_CHECK(hipMallocManaged(&c, sizeof(*c)));
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// Setup input values.
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*a = 1;
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*b = 2;
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// Prefetch the data to the GPU device.
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HIP_CHECK(hipMemPrefetchAsync(a, sizeof(*a), deviceId, 0));
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HIP_CHECK(hipMemPrefetchAsync(b, sizeof(*b), deviceId, 0));
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HIP_CHECK(hipMemPrefetchAsync(c, sizeof(*c), deviceId, 0));
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// Launch add() kernel on GPU.
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add<<<1, 1>>>(a, b, c);
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// Prefetch the result back to the CPU.
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HIP_CHECK(hipMemPrefetchAsync(c, sizeof(*c), hipCpuDeviceId, 0));
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// Wait for the prefetch operations to complete.
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HIP_CHECK(hipDeviceSynchronize());
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// Prints the result.
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std::cout << *a << " + " << *b << " = " << *c << std::endl;
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// Cleanup allocated memory.
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HIP_CHECK(hipFree(a));
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HIP_CHECK(hipFree(b));
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HIP_CHECK(hipFree(c));
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return 0;
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}
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// [sphinx-end] |