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
90 lines
3.4 KiB
Plaintext
90 lines
3.4 KiB
Plaintext
// MIT License
|
|
//
|
|
// Copyright (c) 2025 Advanced Micro Devices, Inc. All rights reserved.
|
|
//
|
|
// Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
// of this software and associated documentation files (the "Software"), to deal
|
|
// in the Software without restriction, including without limitation the rights
|
|
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
// copies of the Software, and to permit persons to whom the Software is
|
|
// furnished to do so, subject to the following conditions:
|
|
//
|
|
// The above copyright notice and this permission notice shall be included in all
|
|
// copies or substantial portions of the Software.
|
|
//
|
|
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
|
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
// SOFTWARE.
|
|
|
|
// [sphinx-start]
|
|
#include <hip/hip_runtime.h>
|
|
|
|
#include <iostream>
|
|
|
|
#define HIP_CHECK(expression) \
|
|
{ \
|
|
const hipError_t err = expression; \
|
|
if(err != hipSuccess) \
|
|
{ \
|
|
std::cerr << "HIP error: " << hipGetErrorString(err) \
|
|
<< " at " << __LINE__ << "\n"; \
|
|
} \
|
|
}
|
|
|
|
// Performs a simple initialization of an array with the thread's index variables.
|
|
// This function is only available in device code.
|
|
__device__ void init_array(float * const a, const unsigned int arraySize)
|
|
{
|
|
// globalIdx uniquely identifies a thread in a 1D launch configuration.
|
|
const int globalIdx = threadIdx.x + blockIdx.x * blockDim.x;
|
|
// Each thread initializes a single element of the array.
|
|
if(globalIdx < arraySize)
|
|
{
|
|
a[globalIdx] = globalIdx;
|
|
}
|
|
}
|
|
|
|
// Rounds a value up to the next multiple.
|
|
// This function is available in host and device code.
|
|
__host__ __device__ constexpr int round_up_to_nearest_multiple(int number, int multiple)
|
|
{
|
|
return (number + multiple - 1)/multiple;
|
|
}
|
|
|
|
__global__ void example_kernel(float * const a, const unsigned int N)
|
|
{
|
|
// Initialize array.
|
|
init_array(a, N);
|
|
// Perform additional work:
|
|
// - work with the array
|
|
// - use the array in a different kernel
|
|
// - ...
|
|
}
|
|
|
|
int main()
|
|
{
|
|
constexpr int N = 100000000; // problem size
|
|
constexpr int blockSize = 256; //configurable block size
|
|
|
|
//needed number of blocks for the given problem size
|
|
constexpr int gridSize = round_up_to_nearest_multiple(N, blockSize);
|
|
|
|
float *a;
|
|
// allocate memory on the GPU
|
|
HIP_CHECK(hipMalloc(&a, sizeof(*a) * N));
|
|
|
|
std::cout << "Launching kernel." << std::endl;
|
|
example_kernel<<<dim3(gridSize), dim3(blockSize), 0/*example doesn't use shared memory*/, 0/*default stream*/>>>(a, N);
|
|
// make sure kernel execution is finished by synchronizing. The CPU can also
|
|
// execute other instructions during that time
|
|
HIP_CHECK(hipDeviceSynchronize());
|
|
std::cout << "Kernel execution finished." << std::endl;
|
|
|
|
HIP_CHECK(hipFree(a));
|
|
}
|
|
// [sphinx-end]
|