cuda-samples/Samples/0_Introduction/mergeSort/main.cpp

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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <cuda_runtime.h>
#include <helper_functions.h>
#include <helper_cuda.h>
#include "mergeSort_common.h"

////////////////////////////////////////////////////////////////////////////////
// Test driver
////////////////////////////////////////////////////////////////////////////////
int main(int argc, char **argv) {
  uint *h_SrcKey, *h_SrcVal, *h_DstKey, *h_DstVal;
  uint *d_SrcKey, *d_SrcVal, *d_BufKey, *d_BufVal, *d_DstKey, *d_DstVal;
  StopWatchInterface *hTimer = NULL;

  const uint N = 4 * 1048576;
  const uint DIR = 1;
  const uint numValues = 65536;

  printf("%s Starting...\n\n", argv[0]);

  int dev = findCudaDevice(argc, (const char **)argv);

  if (dev == -1) {
    return EXIT_FAILURE;
  }

  printf("Allocating and initializing host arrays...\n\n");
  sdkCreateTimer(&hTimer);
  h_SrcKey = (uint *)malloc(N * sizeof(uint));
  h_SrcVal = (uint *)malloc(N * sizeof(uint));
  h_DstKey = (uint *)malloc(N * sizeof(uint));
  h_DstVal = (uint *)malloc(N * sizeof(uint));

  srand(2009);

  for (uint i = 0; i < N; i++) {
    h_SrcKey[i] = rand() % numValues;
  }

  fillValues(h_SrcVal, N);

  printf("Allocating and initializing CUDA arrays...\n\n");
  checkCudaErrors(cudaMalloc((void **)&d_DstKey, N * sizeof(uint)));
  checkCudaErrors(cudaMalloc((void **)&d_DstVal, N * sizeof(uint)));
  checkCudaErrors(cudaMalloc((void **)&d_BufKey, N * sizeof(uint)));
  checkCudaErrors(cudaMalloc((void **)&d_BufVal, N * sizeof(uint)));
  checkCudaErrors(cudaMalloc((void **)&d_SrcKey, N * sizeof(uint)));
  checkCudaErrors(cudaMalloc((void **)&d_SrcVal, N * sizeof(uint)));
  checkCudaErrors(
      cudaMemcpy(d_SrcKey, h_SrcKey, N * sizeof(uint), cudaMemcpyHostToDevice));
  checkCudaErrors(
      cudaMemcpy(d_SrcVal, h_SrcVal, N * sizeof(uint), cudaMemcpyHostToDevice));

  printf("Initializing GPU merge sort...\n");
  initMergeSort();

  printf("Running GPU merge sort...\n");
  checkCudaErrors(cudaDeviceSynchronize());
  sdkResetTimer(&hTimer);
  sdkStartTimer(&hTimer);
  mergeSort(d_DstKey, d_DstVal, d_BufKey, d_BufVal, d_SrcKey, d_SrcVal, N, DIR);
  checkCudaErrors(cudaDeviceSynchronize());
  sdkStopTimer(&hTimer);
  printf("Time: %f ms\n", sdkGetTimerValue(&hTimer));

  printf("Reading back GPU merge sort results...\n");
  checkCudaErrors(
      cudaMemcpy(h_DstKey, d_DstKey, N * sizeof(uint), cudaMemcpyDeviceToHost));
  checkCudaErrors(
      cudaMemcpy(h_DstVal, d_DstVal, N * sizeof(uint), cudaMemcpyDeviceToHost));

  printf("Inspecting the results...\n");
  uint keysFlag = validateSortedKeys(h_DstKey, h_SrcKey, 1, N, numValues, DIR);

  uint valuesFlag = validateSortedValues(h_DstKey, h_DstVal, h_SrcKey, 1, N);

  printf("Shutting down...\n");
  closeMergeSort();
  sdkDeleteTimer(&hTimer);
  checkCudaErrors(cudaFree(d_SrcVal));
  checkCudaErrors(cudaFree(d_SrcKey));
  checkCudaErrors(cudaFree(d_BufVal));
  checkCudaErrors(cudaFree(d_BufKey));
  checkCudaErrors(cudaFree(d_DstVal));
  checkCudaErrors(cudaFree(d_DstKey));
  free(h_DstVal);
  free(h_DstKey);
  free(h_SrcVal);
  free(h_SrcKey);

  exit((keysFlag && valuesFlag) ? EXIT_SUCCESS : EXIT_FAILURE);
}