/*****************************************************************************
*
* test2.c 2012.01.19
*         Make loops a run time variable.
*
* test2.c 2012.01.15
*         Only do a few loops. I want many seperate tasks per second.
*         I will make a script to call this program zillions of times.
*
* testtme.c 2008.12.29
*           Linux version of simple Doug CPU benchmark program
*
* testtme.cpp December 28, 1995 Revision 0 / version 2
*             time loop counter.
*                                                                     Smythies
* testtme.cpp August 24, 1992 Revision 0 / version 1
*             read big file check for time anomallies.
*                                                                     Smythies
*****************************************************************************/

#include <stdlib.h>
#include <stdio.h>
#include <sys/times.h>
#include <sys/resource.h>
#include <time.h>
#include <unistd.h>
#include <math.h>

void main(int argc, char **argv){
   int i, j, k, loops;
   double x,y,z;
   clock_t start, end;
   struct tms t_start, t_end;
   long tps;

   switch(argc){
   case 2:
      loops = atoi(argv[1]);
      break;
   default:
      printf("test2 loops\n");
      printf("  run the CPU time waster for loops cycles\n");
      exit(-1);
   } /* endcase */


   tps = sysconf(_SC_CLK_TCK);

   z = 0.0;
   start = times(&t_start); /* */
   for(i = 0; i < loops; i++){ /* waste cpu time */
      for(j = 0; j < 100; j++){ /* waste cpu time */
         k = (i + j) / 25;
         x = sin((double) k);
         y = sqrt(fabs(x));
         z = z + y; /* prevent the optimizer from taking out the loop */
      } /* endfor */
   } /* endfor */
   end = times(&t_end); /* */
   printf("Elapsed:%10.2f s.  ", ((float)(end - start) / (float)(tps))); /* */
   printf("user cpu:%10.2f s.  ", ((float)(t_end.tms_utime) / (float)(tps)));
   printf("sys cpu:%10.2f s.\n", ((float)(t_end.tms_stime) / (float)(tps)));
/*      start = end; /* */
/*   return(0); /* */
}