451 lines
20 KiB
Java
451 lines
20 KiB
Java
/*
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* Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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/*
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* This is not a regression test, but a micro-benchmark.
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* Be patient; this runs for half an hour!
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*
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* I have run this as follows:
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*
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* for f in -client -server; do mergeBench dolphin . jr -dsa -da $f IteratorMicroBenchmark.java; done
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*
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*
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* @author Martin Buchholz
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*/
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import java.util.*;
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import java.util.concurrent.*;
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import java.util.regex.Pattern;
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public class IteratorMicroBenchmark {
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abstract static class Job {
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private final String name;
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public Job(String name) { this.name = name; }
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public String name() { return name; }
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public abstract void work() throws Throwable;
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}
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private static void collectAllGarbage() {
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final java.util.concurrent.CountDownLatch drained
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= new java.util.concurrent.CountDownLatch(1);
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try {
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System.gc(); // enqueue finalizable objects
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new Object() { protected void finalize() {
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drained.countDown(); }};
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System.gc(); // enqueue detector
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drained.await(); // wait for finalizer queue to drain
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System.gc(); // cleanup finalized objects
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} catch (InterruptedException e) { throw new Error(e); }
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}
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/**
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* Runs each job for long enough that all the runtime compilers
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* have had plenty of time to warm up, i.e. get around to
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* compiling everything worth compiling.
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* Returns array of average times per job per run.
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*/
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private static long[] time0(Job ... jobs) throws Throwable {
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final long warmupNanos = 10L * 1000L * 1000L * 1000L;
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long[] nanoss = new long[jobs.length];
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for (int i = 0; i < jobs.length; i++) {
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collectAllGarbage();
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long t0 = System.nanoTime();
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long t;
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int j = 0;
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do { jobs[i].work(); j++; }
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while ((t = System.nanoTime() - t0) < warmupNanos);
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nanoss[i] = t/j;
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}
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return nanoss;
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}
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private static void time(Job ... jobs) throws Throwable {
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long[] warmup = time0(jobs); // Warm up run
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long[] nanoss = time0(jobs); // Real timing run
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long[] milliss = new long[jobs.length];
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double[] ratios = new double[jobs.length];
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final String nameHeader = "Method";
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final String millisHeader = "Millis";
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final String ratioHeader = "Ratio";
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int nameWidth = nameHeader.length();
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int millisWidth = millisHeader.length();
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int ratioWidth = ratioHeader.length();
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for (int i = 0; i < jobs.length; i++) {
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nameWidth = Math.max(nameWidth, jobs[i].name().length());
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milliss[i] = nanoss[i]/(1000L * 1000L);
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millisWidth = Math.max(millisWidth,
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String.format("%d", milliss[i]).length());
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ratios[i] = (double) nanoss[i] / (double) nanoss[0];
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ratioWidth = Math.max(ratioWidth,
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String.format("%.3f", ratios[i]).length());
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}
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String format = String.format("%%-%ds %%%dd %%%d.3f%%n",
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nameWidth, millisWidth, ratioWidth);
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String headerFormat = String.format("%%-%ds %%%ds %%%ds%%n",
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nameWidth, millisWidth, ratioWidth);
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System.out.printf(headerFormat, "Method", "Millis", "Ratio");
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// Print out absolute and relative times, calibrated against first job
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for (int i = 0; i < jobs.length; i++)
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System.out.printf(format, jobs[i].name(), milliss[i], ratios[i]);
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}
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private static String keywordValue(String[] args, String keyword) {
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for (String arg : args)
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if (arg.startsWith(keyword))
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return arg.substring(keyword.length() + 1);
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return null;
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}
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private static int intArg(String[] args, String keyword, int defaultValue) {
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String val = keywordValue(args, keyword);
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return val == null ? defaultValue : Integer.parseInt(val);
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}
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private static Pattern patternArg(String[] args, String keyword) {
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String val = keywordValue(args, keyword);
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return val == null ? null : Pattern.compile(val);
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}
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private static Job[] filter(Pattern filter, Job[] jobs) {
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if (filter == null) return jobs;
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Job[] newJobs = new Job[jobs.length];
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int n = 0;
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for (Job job : jobs)
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if (filter.matcher(job.name()).find())
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newJobs[n++] = job;
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// Arrays.copyOf not available in JDK 5
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Job[] ret = new Job[n];
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System.arraycopy(newJobs, 0, ret, 0, n);
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return ret;
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}
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private static void deoptimize(int sum) {
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if (sum == 42)
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System.out.println("the answer");
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}
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private static <T> List<T> asSubList(List<T> list) {
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return list.subList(0, list.size());
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}
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private static <T> Iterable<T> backwards(final List<T> list) {
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return new Iterable<T>() {
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public Iterator<T> iterator() {
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return new Iterator<T>() {
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final ListIterator<T> it = list.listIterator(list.size());
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public boolean hasNext() { return it.hasPrevious(); }
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public T next() { return it.previous(); }
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public void remove() { it.remove(); }};}};
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}
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/**
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* Usage: [iterations=N] [size=N] [filter=REGEXP]
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*/
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public static void main(String[] args) throws Throwable {
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final int iterations = intArg(args, "iterations", 100000);
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final int size = intArg(args, "size", 1000);
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final Pattern filter = patternArg(args, "filter");
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final ConcurrentSkipListMap<Integer,Integer> m
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= new ConcurrentSkipListMap<Integer,Integer>();
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final Vector<Integer> v = new Vector<Integer>(size);
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final ArrayList<Integer> al = new ArrayList<Integer>(size);
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// Populate collections with random data
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final Random rnd = new Random();
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for (int i = 0; i < size; i++) {
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m.put(rnd.nextInt(size), rnd.nextInt(size));
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v.add(rnd.nextInt(size));
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}
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al.addAll(v);
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// Also test "short" collections
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final int shortSize = 5;
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final Vector<Integer> sv = new Vector<Integer>(v.subList(0, shortSize));
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final ArrayList<Integer> sal = new ArrayList<Integer>(sv);
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// Checks for correctness *and* prevents loop optimizations
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class Check {
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private int sum;
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public void sum(int sum) {
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if (this.sum == 0)
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this.sum = sum;
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if (this.sum != sum)
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throw new AssertionError("Sum mismatch");
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}
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}
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final Check check = new Check();
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final Check shortCheck = new Check();
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Job[] jobs = {
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// new Job("Vector iterate desugared") {
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// public void work() throws Throwable {
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// for (int i = 0; i < iterations; i++) {
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// int sum = 0;
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// for (Iterator<Integer> it = v.iterator(); it.hasNext();)
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// sum += it.next();
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// check.sum(sum);}}},
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new Job("array loop") {
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public void work() throws Throwable {
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Integer[] a = al.toArray(new Integer[0]);
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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int size = a.length;
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for (int j = 0; j < size; ++j)
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sum += a[j];
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check.sum(sum);}}},
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new Job("Vector get loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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int size = v.size();
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for (int j = 0; j < size; ++j)
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sum += v.get(j);
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check.sum(sum);}}},
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new Job("Vector iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : v)
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sum += n;
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check.sum(sum);}}},
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new Job("Vector descending listIterator loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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ListIterator<Integer> it = v.listIterator(al.size());
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while (it.hasPrevious())
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sum += it.previous();
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check.sum(sum);}}},
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new Job("Vector Enumeration loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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Enumeration<Integer> it = v.elements();
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while (it.hasMoreElements())
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sum += it.nextElement();
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check.sum(sum);}}},
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new Job("Vector subList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : asSubList(v))
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sum += n;
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check.sum(sum);}}},
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new Job("Vector subList subList subList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : asSubList(asSubList(asSubList(v))))
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sum += n;
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check.sum(sum);}}},
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new Job("Vector backwards wrapper ListIterator for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : backwards(v))
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sum += n;
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check.sum(sum);}}},
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new Job("Vector backwards wrapper subList ListIterator for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : backwards(asSubList(v)))
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sum += n;
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check.sum(sum);}}},
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// new Job("Vector iterate for loop invokeinterface") {
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// public void work() throws Throwable {
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// final List<Integer> l = v;
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// for (int i = 0; i < iterations; i++) {
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// int sum = 0;
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// for (Integer n : l)
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// sum += n;
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// check.sum(sum);}}},
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// new Job("Vector subList iterate for loop invokeinterface") {
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// public void work() throws Throwable {
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// final List<Integer> l = v;
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// for (int i = 0; i < iterations; i++) {
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// int sum = 0;
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// for (Integer n : asSubList(l))
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// sum += n;
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// check.sum(sum);}}},
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new Job("Short Vector get loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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int size = sv.size();
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for (int j = 0; j < size; ++j)
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sum += sv.get(j);
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shortCheck.sum(sum);}}},
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new Job("Short Vector iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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for (Integer n : sv)
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sum += n;
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shortCheck.sum(sum);}}},
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new Job("Short Vector sublist iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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for (Integer n : asSubList(sv))
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sum += n;
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shortCheck.sum(sum);}}},
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new Job("ArrayList get loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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int size = al.size();
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for (int j = 0; j < size; ++j)
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sum += al.get(j);
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check.sum(sum);}}},
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new Job("ArrayList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : al)
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sum += n;
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check.sum(sum);}}},
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new Job("ArrayList descending listIterator loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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ListIterator<Integer> it = al.listIterator(al.size());
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while (it.hasPrevious())
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sum += it.previous();
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check.sum(sum);}}},
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new Job("ArrayList listIterator loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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ListIterator<Integer> it = al.listIterator();
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while (it.hasNext())
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sum += it.next();
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check.sum(sum);}}},
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new Job("ArrayList subList get loop") {
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public void work() throws Throwable {
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List<Integer> sl = asSubList(al);
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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int size = sl.size();
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for (int j = 0; j < size; ++j)
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sum += sl.get(j);
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check.sum(sum);}}},
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new Job("ArrayList subList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : asSubList(al))
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sum += n;
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check.sum(sum);}}},
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new Job("ArrayList subList subList subList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : asSubList(asSubList(asSubList(al))))
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sum += n;
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check.sum(sum);}}},
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new Job("ArrayList backwards wrapper ListIterator for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : backwards(al))
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sum += n;
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check.sum(sum);}}},
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new Job("ArrayList backwards wrapper subList ListIterator for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Integer n : backwards(asSubList(al)))
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sum += n;
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check.sum(sum);}}},
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// new Job("ArrayList iterate desugared") {
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// public void work() throws Throwable {
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// for (int i = 0; i < iterations; i++) {
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// int sum = 0;
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// for (Iterator<Integer> it = al.iterator(); it.hasNext();)
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// sum += it.next();
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// check.sum(sum);}}},
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new Job("Short ArrayList get loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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int size = sal.size();
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for (int j = 0; j < size; ++j)
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sum += sal.get(j);
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shortCheck.sum(sum);}}},
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new Job("Short ArrayList iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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for (Integer n : sal)
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sum += n;
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shortCheck.sum(sum);}}},
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new Job("Short ArrayList sublist iterate for loop") {
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public void work() throws Throwable {
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for (int i = 0; i < (iterations * size / shortSize); i++) {
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int sum = 0;
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for (Integer n : asSubList(sal))
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sum += n;
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shortCheck.sum(sum);}}},
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new Job("Vector ArrayList alternating iteration") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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Iterator<Integer> it1 = v.iterator();
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Iterator<Integer> it2 = al.iterator();
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while (it1.hasNext())
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sum += it1.next() + it2.next();
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check.sum(sum/2);}}},
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new Job("Vector ArrayList alternating invokeVirtual iteration") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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List<Iterator<Integer>> its
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= new ArrayList<Iterator<Integer>>(2);
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its.add(v.iterator());
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its.add(al.iterator());
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for (int k = 0; its.get(k).hasNext(); k = (k == 0) ? 1 : 0)
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sum += its.get(k).next();
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check.sum(sum/2);}}},
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new Job("ConcurrentSkipListMap entrySet iterate") {
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public void work() throws Throwable {
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for (int i = 0; i < iterations; i++) {
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int sum = 0;
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for (Map.Entry<Integer,Integer> e : m.entrySet())
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sum += e.getKey();
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deoptimize(sum);}}}
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};
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time(filter(filter, jobs));
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}
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}
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