pt.minha.calibration.AbstractBenchmark.java Source code

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Here is the source code for pt.minha.calibration.AbstractBenchmark.java

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/*
 * Minha.pt: middleware testing platform.
 * Copyright (c) 2011-2014, Universidade do Minho.
 * 
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */

package pt.minha.calibration;

import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.lang.management.ManagementFactory;
import java.lang.management.ThreadMXBean;
import java.net.InetSocketAddress;
import java.util.Map;

import org.apache.commons.math3.stat.descriptive.moment.Mean;
import org.apache.commons.math3.stat.descriptive.moment.Variance;

import pt.minha.api.sim.Global;

/**
 * Base class for calibration benchmarks.
 */
public abstract class AbstractBenchmark implements Benchmark {
    public InetSocketAddress srv;
    public int samples;
    public int payload;

    private transient double[] times;
    private transient double[] sizes;
    private transient int idx, begin;
    private transient long cputime;
    private transient ThreadMXBean mxbean;

    public void setParameters(Map<String, Object> p) {
        this.srv = (InetSocketAddress) p.get("server");
        this.samples = (Integer) p.get("samples");
        this.payload = (Integer) p.get("payload");

        begin = 0;
        idx = 0;
        sizes = new double[samples];
        times = new double[samples];
    }

    protected Result stop(boolean interarrival) {
        double cpu = ((double) (mxbean.getCurrentThreadCpuTime() - cputime)) / idx;
        if (interarrival) {
            for (int i = idx - 1; i > 0; i--)
                times[i] -= times[i - 1];
            begin = 1;
        }
        Mean mean = new Mean();
        double m = mean.evaluate(times, begin, idx - begin);
        Variance var = new Variance();
        double v = var.evaluate(times, m, begin, idx - begin);
        return new Result(m, v, cpu);
    }

    protected void add(double length, double now) {
        sizes[idx] = length;
        times[idx] = now;
        idx++;
    }

    protected void start() {
        mxbean = ManagementFactory.getThreadMXBean();
        mxbean.setThreadCpuTimeEnabled(true);
        cputime = mxbean.getCurrentThreadCpuTime();
    }

    private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
        ois.defaultReadObject();

        begin = 0;
        idx = 0;
        sizes = new double[samples];
        times = new double[samples];
    }

    protected static boolean readFully(InputStream in, byte[] buffer) throws IOException {
        int length = 0;
        while (length < buffer.length) {
            int n = in.read(buffer, length, buffer.length - length);
            if (n <= 0)
                return false;
            length += n;
        }
        return true;
    }

    public String toString() {
        return "probe: " + samples + " samples of " + payload + " bytes";
    }

    @Global
    public static class Result implements Serializable {
        public double meanLatency, varLatency;
        public double meanCPU;

        public Result(double meanLatency, double varLatency, double meanCPU) {
            super();
            this.meanLatency = meanLatency;
            this.varLatency = varLatency;
            this.meanCPU = meanCPU;
        }

        public String toString() {
            return "latency=" + meanLatency + "(" + varLatency + ") cpu=" + meanCPU;
        }
    }
}