com.datatorrent.netlet.benchmark.util.BenchmarkResults.java Source code

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Here is the source code for com.datatorrent.netlet.benchmark.util.BenchmarkResults.java

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/**
 * Copyright (C) 2015 DataTorrent, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.datatorrent.netlet.benchmark.util;

import java.io.PrintStream;

import org.apache.commons.math3.stat.descriptive.DescriptiveStatistics;
import org.apache.commons.math3.util.Precision;

public class BenchmarkResults {
    private static final int PRECISION = 3;
    private long[] results;
    private int pos;

    public BenchmarkResults(int count) {
        pos = 0;
        results = new long[count];
    }

    public void addResult(long time) {
        results[pos++] = time;
    }

    private DescriptiveStatistics getDescriptiveStatistics() {
        double[] results = new double[pos];
        for (int i = 0; i < pos; i++) {
            results[i] = this.results[i];
        }
        return new DescriptiveStatistics(results);
    }

    private static String fromNanoTime(double nanoTime) {
        if (nanoTime > 1000000d) {
            return Precision.round(nanoTime / 1000000d, PRECISION) + " millis";
        } else if (nanoTime > 1000d) {
            return Precision.round(nanoTime / 1000d, PRECISION) + " micros";
        } else {
            return Precision.round(nanoTime, PRECISION) + " nanos";
        }
    }

    private String getResults() {
        DescriptiveStatistics statistics = getDescriptiveStatistics();
        final StringBuilder sb = new StringBuilder();
        sb.append("Iterations: ").append(statistics.getN());
        sb.append(" | Avg Time: ").append(fromNanoTime(statistics.getMean()));
        sb.append(" | Min Time: ").append(fromNanoTime(statistics.getMin()));
        sb.append(" | Max Time: ").append(fromNanoTime(statistics.getMax()));
        sb.append(" | 75% Time: ").append(fromNanoTime(statistics.getPercentile(75d)));
        sb.append(" | 90% Time: ").append(fromNanoTime(statistics.getPercentile(90d)));
        sb.append(" | 99% Time: ").append(fromNanoTime(statistics.getPercentile(99d)));
        sb.append(" | 99.9% Time: ").append(fromNanoTime(statistics.getPercentile(99.9d)));
        sb.append(" | 99.99% Time: ").append(fromNanoTime(statistics.getPercentile(99.99d)));
        sb.append(" | 99.999% Time: ").append(fromNanoTime(statistics.getPercentile(99.999d)));

        return sb.toString();

    }

    public void printResults(PrintStream out) {
        StringBuilder results = new StringBuilder();
        results.append("results=");
        results.append(getResults());
        out.println(results);
    }

}