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
96 lines
3.7 KiB
Plaintext
96 lines
3.7 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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#include "example_utils.hpp"
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#include <hip/hip_runtime.h>
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#include <cstdlib>
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#include <iostream>
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#include <numeric>
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#include <vector>
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///\brief Calculates \p a[i] = \p a[i] + \p b[i] where \p i stands for the thread's index in the grid.
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// [sphinx-kernel-start]
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__global__ void AddKernel(float* a, const float* b)
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{
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int global_idx = threadIdx.x + blockIdx.x * blockDim.x;
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a[global_idx] += b[global_idx];
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}
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// [sphinx-kernel-end]
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int main()
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{
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// The number of float elements in each vector.
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constexpr unsigned int size = 1 << 20; // == 1'048'576 elements
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// Bytes to allocate for each device vector.
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constexpr size_t size_bytes = size * sizeof(float);
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// Number of threads per kernel block.
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constexpr unsigned int threads_per_block = 256;
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// Number of blocks per kernel grid. The expression below calculates ceil(size/block_size).
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constexpr unsigned int number_of_blocks = ceiling_div(size, threads_per_block);
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// Allocate a vector and fill it with an increasing sequence (i.e. 1, 2, 3, 4...)
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std::vector<float> h_a(size);
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std::iota(h_a.begin(), h_a.end(), 1.f);
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// Allocate b vector and fill it with a decreasing sequence (i.e. 1'048'576, 1'048'575, ..., 3, 2, 1)
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std::vector<float> h_b(size);
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std::iota(h_b.rbegin(), h_b.rend(), 1.f);
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// Allocate and copy vectors to device memory.
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float* d_a{};
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float* d_b{};
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HIP_CHECK(hipMalloc(&d_a, size_bytes));
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HIP_CHECK(hipMalloc(&d_b, size_bytes));
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HIP_CHECK(hipMemcpy(d_a, h_a.data(), size_bytes, hipMemcpyHostToDevice));
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HIP_CHECK(hipMemcpy(d_b, h_b.data(), size_bytes, hipMemcpyHostToDevice));
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std::cout << "Calculating a[i] = a[i] + b[i] over " << size << " elements." << std::endl;
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// Launch the kernel on the default stream.
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// [sphinx-kernel-launch-start]
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AddKernel<<<number_of_blocks, threads_per_block>>>(d_a, d_b);
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// [sphinx-kernel-launch-end]
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// Check if the kernel launch was successful.
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HIP_CHECK(hipGetLastError());
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// Copy the results back to the host. This call blocks the host's execution until the copy is finished.
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HIP_CHECK(hipMemcpy(h_a.data(), d_a, size_bytes, hipMemcpyDeviceToHost));
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// Free device memory.
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HIP_CHECK(hipFree(d_b));
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HIP_CHECK(hipFree(d_a));
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// Print the first few elements of the results:
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constexpr size_t elements_to_print = 10;
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std::cout << "First " << elements_to_print << " elements of the results: "
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<< format_range(h_a.begin(), h_a.begin() + elements_to_print) << std::endl;
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return EXIT_SUCCESS;
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}
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