63 lines
2.2 KiB
C++
63 lines
2.2 KiB
C++
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#include <iostream>
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#include <iomanip>
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#include <fstream>
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#include <math.h>
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#define MAX_ARRAY_SIZE 1000
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using namespace std;
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void calculations(float deltaVal, float deviationVal, string outputFileName);
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int main(int argc, char const *argv[])
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{
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// calculate part a
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calculations(0.125, 0.500, "P3A.txt");
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calculations(0.125, 1.500, "P3B.txt");
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calculations(0.25, 0.500, "P3C.txt");
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}
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void calculations(float deltaVal, float deviationVal, string outputFileName)
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{
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ofstream outputFile;
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outputFile.open(outputFileName.c_str());
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// difference = sampleRTT - estimatedRTT
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// estimatedRTT = estimatedRTT + (delta * difference)
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// deviation = deviation + delta(|difference| - deviation)
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// timeOut = mu * estimatedRTT + (phi * deviation)
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float delta = 0.0, mu = 0.0, phi = 0.0; //
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float difference = 0.0, estimatedRTT = 0.0, sampleRTT = 0.0;
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float deviation = 0.0, timeOut = 0.0, tmpDeviation = 0.0, tmpestimateRTT = 0.0;
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// Values for Jacobson/Karels Algorithim
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delta = deltaVal;
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mu = 1.0;
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phi = 4.0;
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// do-while loop
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int i = 0;
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outputFile << "Iteration #\t\tSampleRTT\t\tEstimatedRTT\t\t Deviation\t\tDifference\t\tTimeout\n";
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do
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{
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// initial values
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if (i == 0)
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{
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outputFile << fixed << setprecision(4);
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estimatedRTT = 4.000;
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deviation = deviationVal;
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outputFile << i << "\t\t\t\t - \t\t\t\t\t" << estimatedRTT << "\t\t\t\t" << deviation << "\t\t\t - \t\t\t - \n";
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i++;
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}
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sampleRTT = 1.0000;
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difference = sampleRTT - estimatedRTT;
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// calculate estimatedRTT again
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estimatedRTT = estimatedRTT + (delta * difference);
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deviation = deviation + delta*(fabs(difference) - deviation);
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timeOut = mu * estimatedRTT + (phi * deviation);
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outputFile << i << "\t\t\t\t" << setw(5) << setfill(' ') << sampleRTT << setw(10) << setfill(' ') << "\t\t" << estimatedRTT << setw(8) << setfill(' ') <<
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"\t\t" << deviation << setw(3) << setfill(' ') << "\t\t" << difference << setw(8) << setfill(' ') << "\t" << timeOut << endl;
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i++;
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} while (timeOut > 4.0);
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outputFile.close();
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}
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