Java example source code file (BaseBench.java)

This example Java source code file (BaseBench.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

args, basebench, jobjc, jobjcruntime, nativeargumentbuffer, pooledtestcase, string, task, unsafe

The BaseBench.java Java example source code

/*
 * Copyright (c) 2011, 2012, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package com.apple.jobjc;

import sun.misc.Unsafe;

public class BaseBench extends PooledTestCase {
    protected final static JObjCRuntime RUNTIME = JObjCRuntime.getInstance();
    protected final static JObjC JOBJC = JObjC.getInstance();
    protected final static Unsafe UNSAFE = JObjCRuntime.getInstance().unsafe;
    protected final static NativeArgumentBuffer ARGS = JObjCRuntime.getInstance().getThreadLocalState();

    public abstract static class Task{
        final String name;
        public Task(String name){ this.name = name; }
        public abstract void run();
    }

    public void bench(final String title, final long warmup, final long runs, final long iterations, final Task... tasks){
        final long[] runtimes = new long[tasks.length];

        for(int t = 0; t < tasks.length; ++t){
            long runtime = 0;
            for(int i = 0; i < warmup; ++i)
                singleBench(iterations, tasks[t]);
            for(int i = 0; i < runs; ++i)
                runtime = runtime + singleBench(iterations, tasks[t]);
            runtimes[t] = runtime;
        }

        final float[] relatives = new float[tasks.length];

        for(int t = 0; t < tasks.length; ++t)
            relatives[t] = ((float) runtimes[t] / (float) runs);

        float min = relatives[0];
        for(float t : relatives)
            if(t < min)
                min = t;

        for(int t = 0; t < tasks.length; ++t)
            relatives[t] = relatives[t] / min;

        System.out.format("\n* %1$s\n", title);
        for(int t = 0; t < tasks.length; ++t)
            System.out.format("%1$60s : %2$.1f\n", tasks[t].name, relatives[t]);
    }

    public long singleBench(final long iterations, final Task task){
        long start = System.currentTimeMillis();
        for(long i = 0; i < iterations; ++i)
            task.run();
        long end = System.currentTimeMillis();
        return end - start;
    }
}