com.github.jinahya.codec.BossVsEngineerTestNanoTimeDecode.java Source code

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Here is the source code for com.github.jinahya.codec.BossVsEngineerTestNanoTimeDecode.java

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/*
 * Copyright 2012 Jin Kwon <jinahya at gmail.com>.
 *
 * 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.github.jinahya.codec;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.concurrent.ThreadLocalRandom;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.commons.math3.stat.StatUtils;
import org.testng.annotations.AfterClass;
import org.testng.annotations.BeforeClass;
import org.testng.annotations.Test;

/**
 *
 * @author Jin Kwon <jinahya at gmail.com>
 */
@Test(groups = { "benchmark" }, singleThreaded = true)
public class BossVsEngineerTestNanoTimeDecode {

    private static final int ROUNDS = 1024;

    static {
        if (ROUNDS < 7) {
            throw new InstantiationError("ROUNDS(" + ROUNDS + ") < 7");
        }
    }

    private static final Logger LOGGER = Logger.getLogger(BossVsEngineerTestNanoTimeDecode.class.getName());

    @BeforeClass
    private static void warmUp() throws IOException {
        LOGGER.info("warmUp()");

        final ByteArrayOutputStream baos = new ByteArrayOutputStream();

        final long freeMemory = Runtime.getRuntime().freeMemory();
        LOGGER.log(Level.INFO, "Runtime.freeMemory: {0}", freeMemory);

        for (int i = 0; i < 16; i++) {
            baos.reset();
            while (baos.size() < 1048576L) {
                baos.write(Tests.decodedBytes());
            }
            final byte[] decoded = baos.toByteArray();
            new HexEncoder().encodeLikeABoss(decoded);
            new HexEncoder().encodeLikeAnEngineer(decoded);
        }

        for (int i = 0; i < 16; i++) {
            baos.reset();
            while (baos.size() < 1048576L) {
                baos.write(Tests.encodedBytes());
            }
            final byte[] encoded = baos.toByteArray();
            new HexDecoder().decodeLikeABoss(encoded);
            new HexDecoder().decodeLikeAnEngineer(encoded);
        }

        for (int i = 0; i < 128; i++) {
            decodeLikeABoss(Tests.encodedBytes());
            decodeLikeAnEngineer(Tests.encodedBytes());
        }
    }

    @AfterClass
    private static void coolDown() {
        LOGGER.info("coolDown()");
    }

    private static long decodeLikeABoss(final byte[] encoded) {
        final long start = System.nanoTime();
        new HexDecoder().decodeLikeABoss(encoded);
        return System.nanoTime() - start;
    }

    private static long decodeLikeAnEngineer(final byte[] encoded) {
        final long start = System.nanoTime();
        new HexDecoder().decodeLikeAnEngineer(encoded);
        return System.nanoTime() - start;
    }

    @Test
    public void testDecode() {

        final double[] elapsedLikeABoss = new double[ROUNDS];
        final double[] elapsedLikeAnEngineer = new double[ROUNDS];

        for (int i = 0; i < ROUNDS; i++) {
            final byte[] encoded = Tests.encodedBytes();
            if (ThreadLocalRandom.current().nextBoolean()) {
                elapsedLikeABoss[i] = decodeLikeABoss(encoded);
                elapsedLikeAnEngineer[i] = decodeLikeAnEngineer(encoded);
            } else {
                elapsedLikeAnEngineer[i] = decodeLikeAnEngineer(encoded);
                elapsedLikeABoss[i] = decodeLikeABoss(encoded);
            }
        }

        LOGGER.log(Level.INFO, "elapsed.like.a.boss: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]", new Object[] {
                StatUtils.mean(elapsedLikeABoss, 1, elapsedLikeABoss.length - 1), elapsedLikeABoss[0],
                elapsedLikeABoss[1], elapsedLikeABoss[2], elapsedLikeABoss[elapsedLikeABoss.length - 3],
                elapsedLikeABoss[elapsedLikeABoss.length - 2], elapsedLikeABoss[elapsedLikeABoss.length - 1] });

        LOGGER.log(Level.INFO, "elapsed.like.an.engineer: {0} [{1}, {2}, {3}, ..., {4}, {5}, {6}]",
                new Object[] { StatUtils.mean(elapsedLikeAnEngineer, 1, elapsedLikeAnEngineer.length - 1),
                        elapsedLikeAnEngineer[0], elapsedLikeAnEngineer[1], elapsedLikeAnEngineer[2],
                        elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 3],
                        elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 2],
                        elapsedLikeAnEngineer[elapsedLikeAnEngineer.length - 1] });
    }

}