makecdf.cc

TCP westwood code, download

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

// in units of 0.1 milliseconds
#define MAX_DELAY 5000 

int main(int argc, char* argv[])
{
	unsigned int occurrence[MAX_DELAY];
	FILE *finput;
	FILE *foutput;
	double time;
	double delay;
	double avg;
	unsigned int station;
	unsigned int traffic_class;
	long total_packets;

	if (argc<3 && argc>4) return 1;
	double ignore_time=0.0;
	if (argc==4) {
		ignore_time=atof(argv[3]);
		if (ignore_time<0.0) return 1;
	}
	total_packets=0; avg=0.0;
	for (int i=0; i<MAX_DELAY; i++) occurrence[i]=0;
	printf("Making CDF..\n");
	finput=fopen(argv[1],"r");
	while (feof(finput)==0) {
		fscanf(finput,"%lf %lf %d:%d\n",&time,&delay,&station,&traffic_class);
		if (time<ignore_time) continue;
		for (int i=0; i<MAX_DELAY; i++) if ((int)ceil(delay*10000.0)<=i) occurrence[i]++;
		avg+=delay;
		total_packets+=1;
		//printf("%lf %lf %d:%d\n",time,delay,station,traffic_class);
	}
	fclose(finput);
	printf("\t..total number of packets processed for %d:%d is %d\n",station,traffic_class,total_packets);
	printf("\tAverage delay is %2.9lf\n",avg/total_packets);
	foutput=fopen(argv[2],"w");
	for (int i=0; i<MAX_DELAY; i++) {
		double delay=i;
		delay=delay/10000.0;
		double cdf=occurrence[i];
		cdf=cdf/total_packets;
		fprintf(foutput,"%lf %lf\n",delay,cdf);
	}
	fclose(foutput);
	return 0;
}