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
119 lines
3.9 KiB
Plaintext
119 lines
3.9 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 <cmath>
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#include <iostream>
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#include <limits>
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#include <vector>
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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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exit(EXIT_FAILURE); \
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} \
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}
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// Simple ULP difference calculator
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int64_t ulp_diff(float a, float b)
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{
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if (a == b)
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return 0;
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union
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{
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float f;
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int32_t i;
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} ua{a}, ub{b};
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// For negative values, convert to a positive-based representation
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if (ua.i < 0) ua.i = std::numeric_limits<int32_t>::max() - ua.i;
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if (ub.i < 0) ub.i = std::numeric_limits<int32_t>::max() - ub.i;
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return std::abs((int64_t)ua.i - (int64_t)ub.i);
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}
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// Test kernel
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__global__ void test_sin(float* out, int n)
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{
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int i = blockIdx.x * blockDim.x + threadIdx.x;
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if (i < n)
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{
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float x = -M_PI + (2.0f * M_PI * i) / (n - 1);
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out[i] = sinf(x);
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}
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}
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int main()
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{
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const int n = 1000000;
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const int blocksize = 256;
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std::vector<float> outputs(n);
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float* d_out;
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HIP_CHECK(hipMalloc(&d_out, n * sizeof(float)));
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dim3 threads(blocksize);
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dim3 blocks((n + blocksize - 1) / blocksize); // Fixed grid calculation
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test_sin<<<blocks, threads>>>(d_out, n);
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HIP_CHECK(hipPeekAtLastError());
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HIP_CHECK(hipMemcpy(outputs.data(), d_out, n * sizeof(float), hipMemcpyDeviceToHost));
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// Step 1: Find the maximum absolute error
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double max_abs_error = 0.0;
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float max_error_output = 0.0;
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float max_error_expected = 0.0;
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for (int i = 0; i < n; i++)
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{
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float x = -M_PI + (2.0f * M_PI * i) / (n - 1);
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float expected = std::sin(x);
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double abs_error = std::abs(outputs[i] - expected);
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if (abs_error > max_abs_error)
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{
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max_abs_error = abs_error;
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max_error_output = outputs[i];
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max_error_expected = expected;
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}
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}
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// Step 2: Compute ULP difference based on the max absolute error pair
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int64_t max_ulp = ulp_diff(max_error_output, max_error_expected);
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// Output results
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std::cout << "Max Absolute Error: " << max_abs_error << std::endl;
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std::cout << "Max ULP Difference: " << max_ulp << std::endl;
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std::cout << "Max Error Values -> Got: " << max_error_output
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<< ", Expected: " << max_error_expected << std::endl;
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HIP_CHECK(hipFree(d_out));
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return 0;
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}
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// [sphinx-end]
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