rocm-systems/perftests/memory/hipPerfDevMemWriteSpeed.cpp

/*
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*/

/* HIT_START
 * BUILD: %t %s ../../src/test_common.cpp EXCLUDE_HIP_PLATFORM nvcc
 * TEST: %t
 * HIT_END
 */

#include <iostream>
#include <chrono>
#include "test_common.h"

using namespace std;

#define arraySize 16

typedef struct d_uint16 {
  uint data[arraySize];
} d_uint16;

__global__ void write_kernel(d_uint16 *dst, ulong N, d_uint16 pval) {
    size_t idx = (blockIdx.x * blockDim.x + threadIdx.x);
    size_t stride = blockDim.x * gridDim.x;
    for (size_t i = idx; i < N; i += stride) {
      dst[i] = pval;
    }
};

int main(int argc, char* argv[]) {
  d_uint16 *dDst;
  d_uint16 *hDst;
  hipStream_t stream;
  ulong N = 4 * 1024 * 1024;
  uint nBytes = N * sizeof(d_uint16);
  d_uint16 pval;

  for (int i = 0; i < arraySize; i++) {
    pval.data[i] = 0xabababab;
  }

  int nGpu = 0;
  HIPCHECK(hipGetDeviceCount(&nGpu));
  if (nGpu < 1) {
      cout << "info: didn't find any GPU! skipping the test!\n";
      passed();
      return 0;
  }

  static int device = 0;
  HIPCHECK(hipSetDevice(device));
  hipDeviceProp_t props;
  HIPCHECK(hipGetDeviceProperties(&props, device));
  cout << "info: running on bus " << "0x" << props.pciBusID << " " << props.name <<
      " with " << props.multiProcessorCount << " CUs" << endl;

  size_t threadsPerBlock = 64;
  size_t blocks = props.multiProcessorCount * 4;

  uint inputData = 0xabababab;
  int nIter = 1000;

  hDst =  new d_uint16[nBytes];
  HIPCHECK(hDst == 0 ? hipErrorOutOfMemory : hipSuccess);
  for (size_t i = 0; i < N; i++) {
    for (size_t j = 0; j < arraySize; j++) {
      hDst[i].data[j] = 0;
    }
  }

  HIPCHECK(hipMalloc(&dDst, nBytes));

  HIPCHECK(hipStreamCreate(&stream));


  cout << "info: warm up launch for 'write_kernel' on the stream " << stream << endl;

  hipLaunchKernelGGL(write_kernel, dim3(blocks), dim3(threadsPerBlock), 0, stream, dDst, N, pval);
  HIPCHECK(hipMemcpy(hDst, dDst, nBytes , hipMemcpyDeviceToHost));
  hipDeviceSynchronize();

  for (uint i = 0; i < N; i++) {
    for (uint j = 0; j < arraySize; j++) {
      if (hDst[i].data[j] != inputData) {
        cout << "info: Data validation failed for warm up run! " << endl;
        cout << "at index i: " << i << " element j: " << j << endl;
        cout << hex << "expected 0x" << inputData << " but got 0x" << hDst[i].data[j] << endl;
        HIPCHECK(hipErrorUnknown);
      }
    }
  }

  cout << "info: data validated for warm up launch for 'write_kernel" << endl;
  cout << "info: launching 'write_kernel' on the stream " << stream << " for "<< nIter << " iterations"<< endl;

  auto all_start = chrono::steady_clock::now();
  for(int i = 0; i < nIter; i++) {
    hipLaunchKernelGGL(write_kernel, dim3(blocks), dim3(threadsPerBlock), 0, stream, dDst, N, pval);
  }
  hipDeviceSynchronize();
  auto all_end = chrono::steady_clock::now();
  chrono::duration<double> all_kernel_time = all_end - all_start;

  // read speed in GB/s
  double perf = ((double)nBytes * nIter * (double)(1e-09)) / all_kernel_time.count();

  cout << "info: average write speed of " << perf << " GB/s " << "achieved for memory size of " <<
      nBytes / (1024 * 1024) << " MB, calculated based on host time" << endl;

  // measure performance based on events time
  hipEvent_t start, stop;
  HIPCHECK(hipEventCreate(&start));
  HIPCHECK(hipEventCreate(&stop));
  float allEventMs = 0;
  for(int i = 0; i < nIter; i++) {
    HIPCHECK(hipEventRecord(start, NULL));

    hipLaunchKernelGGL(write_kernel, dim3(blocks), dim3(threadsPerBlock), 0, stream, dDst, N, pval);

    HIPCHECK(hipEventRecord(stop, NULL));
    HIPCHECK(hipEventSynchronize(stop));

    float eventMs = 1.0f;
    HIPCHECK(hipEventElapsedTime(&eventMs, start, stop));

    allEventMs += eventMs;

  }

  double perfe = ((double)nBytes * nIter * (double)(1e-06)) / allEventMs;
  cout << "info: average write speed of " << perfe << " GB/s " << "achieved for memory size of " <<
      nBytes / (1024 * 1024) << " MB, calculated based on events time" << endl;

  delete [] hDst;
  hipFree(dDst);
  HIPCHECK(hipStreamDestroy(stream));

  passed();
}