/*****************************************************************************
*
* waiter_high_freq.c 2012.06.14 Smythies
*        High Frequency sweep, into breakdown range.
*
* waiter_freq04.c 2012.05.07 Smythies
*        A program to build a script for use with the waiter program.
*        Everything is coded herein. Re-compile to change things.
*        This one sweeps the load for different numbers of processes.
*
*****************************************************************************/

#include <stdio.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>

#define LOOPS_PER_USEC 207.547 /* Tight loops per second. s15.smythies.com. CONFIG_NO_HZ=n or y kernels */
                               /* for CPUs set to powersave mode */
                               /* The above number is machine dependent. You will need to figure it out for yours */

void main(int argc, char **argv){

   double load, period, s, c, freq;
   int l;

   printf("#! /bin/bash\n");
   printf("# generated by waiter_high_freq.c - a high frequency sweep, well into the breakdown range.\n");
   printf("# Note: the ability to estimate accurately is greately reduced at high frequencies.\n");
   printf("# Please recored the actual resulting loads and frequencies.\n");

   load = 0.80;  /* we go with a fixed load for this one */

   for(freq = 100.0; freq <= 2100.1; freq = freq + 100.0){
      period = 1.0 / freq;
      c = period * load;
      s = period - c;
      if(s < 0.0){
         printf("Doug: you have screwed up. Sleep time is negative: %lf\n", s);
         exit (-1);
      } /* endif */
      l = (int) (c * LOOPS_PER_USEC * 1000000 + 0.5);
      printf("# Freq = %4lf Hz; Processes = 3; Load = %4.2lf\n", freq, load);
      if(freq == 100.0){ /* do some settling for the first one */
         printf("../c/waiter 3 180 %d %d %d 1\n", (int) (10.0 * freq + 0.5), l, (int) (s * 1000000 + 0.5));
         printf("../c/waiter 3 180 %d %d %d 1\n", (int) (10.0 * freq + 0.5), l, (int) (s * 1000000 + 0.5));
         printf("../c/waiter 3 180 %d %d %d 1 > waiter_ex_data\n", (int) (10.0 * freq + 0.5), l, (int) (s * 1000000 + 0.5)); /* and start the files */
         printf("uptime >freq_high\n\n");
      } else {
         printf("../c/waiter 3 180 %d %d %d 1 >> waiter_ex_data\n", (int) (10.0 * freq + 0.5), l, (int) (s * 1000000 + 0.5));
         printf("uptime >>freq_high\n\n");
      } /* endif */
   } /* endfor */
} /* endprogram */