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gpu_stress_kern.cc
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gpu_stress_kern.cc
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//author T.Lunttila, CSC
#include "hip/hip_runtime.h"
#include <stdlib.h>
#include <stdio.h>
#include <mpi.h>
#include <vector>
#include <chrono>
#include <iostream>
using namespace std;
constexpr int error_exit_code = -1;
#define HIP_CHECK(condition) \
{ \
const hipError_t error = condition; \
if(error != hipSuccess) \
{ \
std::cerr << "An error encountered: \"" << hipGetErrorString(error) << "\" at " \
<< __FILE__ << ':' << __LINE__ << std::endl; \
std::exit(error_exit_code); \
} \
}
__global__ void busy_loop(double *array, double *out, uint64_t max, uint32_t repeat) {
uint64_t idx = threadIdx.x + blockIdx.x * blockDim.x;
double temp = 0;
for (uint32_t j=0; j<repeat; ++j) {
temp+=sin(array[(idx+j)%max])*cos(array[(idx+j)%max]);
}
out[idx] = temp;
}
int main(int argc, char* argv[])
{
int rank, wsize, namelen;
char nodename[MPI_MAX_PROCESSOR_NAME];
char busID[80];
uint32_t repeat = 64;
uint64_t size = static_cast<uint64_t>(256) * 1024 * 1024;
std::vector<double> array(size);
double *d_array, *d_out;
hipDevice_t deviceID;
for (int i=0;i<size;++i) array[i] = 1.0*i/size;
MPI_Init(&argc, &argv);
MPI_Comm_size(MPI_COMM_WORLD, &wsize);
MPI_Comm_rank(MPI_COMM_WORLD, &rank);
MPI_Get_processor_name(nodename, &namelen);
if (argc>1) repeat = atoi(argv[1]);
HIP_CHECK(hipMalloc(&d_array, size * sizeof(double)));
HIP_CHECK(hipMalloc(&d_out, size * sizeof(double)));
HIP_CHECK(hipMemcpy(d_array, array.data(), size * sizeof(uint64_t), hipMemcpyHostToDevice));
auto start = std::chrono::high_resolution_clock::now();
hipLaunchKernelGGL(busy_loop, dim3(size/256), dim3(256), 0, hipStreamDefault, d_array, d_out, size, repeat);
HIP_CHECK(hipGetLastError());
HIP_CHECK(hipStreamSynchronize(hipStreamDefault));
HIP_CHECK(hipMemcpy(array.data(), d_out, size * sizeof(double), hipMemcpyDeviceToHost));
HIP_CHECK(hipFree(d_array));
HIP_CHECK(hipFree(d_out));
HIP_CHECK(hipDeviceGet(&deviceID, 0));
HIP_CHECK(hipDeviceGetPCIBusId(busID, 80, deviceID));
auto stop = std::chrono::high_resolution_clock::now();
auto duration = std::chrono::duration_cast<std::chrono::milliseconds>(stop - start);
std::cout << "node: " << nodename << " GPU Bus ID: " << busID << " time: " << duration.count()/1000.0 << std::endl;
MPI_Finalize();
}