testing/data_performance/main.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <assert.h>
   4 #include <sys/time.h>
   5
   6 typedef struct
   7 {
   8         float time;
   9         float value;
  10 } DataPoint;
  11
  12
  13
  14
  15 int main(int argc, char ** argv)
  16 {
  17         assert(argc == 3);
  18
  19         int bufsiz = atoi(argv[1]);
  20         int numpoints = atoi(argv[2]);
  21         assert(bufsiz > 0);
  22         DataPoint * buffer = (DataPoint*)(calloc(bufsiz, sizeof(DataPoint)));
  23
  24         struct timeval start_time;
  25         gettimeofday(&start_time, NULL);
  26
  27         FILE * file = fopen("data.bin", "wb");
  28
  29         int i = 0;
  30         while (i < numpoints)
  31         {
  32                 int j = 0;
  33                 for (j = 0; j < bufsiz && i < numpoints; ++j)
  34                 {
  35                         buffer[j].time = i;
  36                         buffer[j].value = i;
  37
  38                 }
  39                 i += j;
  40                 assert(fwrite(buffer, sizeof(DataPoint), j, file) == j);
  41
  42
  43         }
  44
  45         fclose(file);
  46
  47
  48         struct timeval end_time;
  49         gettimeofday(&end_time, NULL);
  50
  51         free(buffer);
  52         float time_elapsed = (float)(end_time.tv_sec - start_time.tv_sec) + 1e-6*(end_time.tv_usec - start_time.tv_usec);
  53         printf("%f\n", time_elapsed);
  54         return 0;
  55 }