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/* |
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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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/* |
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* @test |
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* @summary micro-benchmark correctness mode |
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* @run main IteratorMicroBenchmark iterations=1 size=8 warmup=0 |
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*/ |
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|
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import java.lang.ref.WeakReference; |
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import java.util.ArrayDeque; |
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import java.util.ArrayList; |
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import java.util.Enumeration; |
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import java.util.Iterator; |
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import java.util.List; |
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import java.util.ListIterator; |
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import java.util.Map; |
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import java.util.Vector; |
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import java.util.concurrent.ConcurrentSkipListMap; |
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import java.util.concurrent.CountDownLatch; |
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import java.util.concurrent.ThreadLocalRandom; |
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import java.util.concurrent.TimeUnit; |
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import java.util.regex.Pattern; |
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|
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/** |
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* Usage: [iterations=N] [size=N] [filter=REGEXP] [warmup=SECONDS] |
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* |
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* To run this in micro-benchmark mode, simply run as a normal java program. |
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* Be patient; this runs for an hour! |
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* For faster runs, restrict execution using command line args. |
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* |
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* @author Martin Buchholz |
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*/ |
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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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|
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static double warmupSeconds = 10; |
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|
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// --------------- GC finalization infrastructure --------------- |
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|
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/** No guarantees, but effective in practice. */ |
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static void forceFullGc() { |
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CountDownLatch finalizeDone = new CountDownLatch(1); |
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WeakReference<?> ref = new WeakReference<Object>(new Object() { |
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protected void finalize() { finalizeDone.countDown(); }}); |
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try { |
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for (int i = 0; i < 10; i++) { |
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System.gc(); |
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if (finalizeDone.await(1L, TimeUnit.SECONDS) && ref.get() == null) { |
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System.runFinalization(); // try to pick up stragglers |
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return; |
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} |
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} |
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} catch (InterruptedException unexpected) { |
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throw new AssertionError("unexpected InterruptedException"); |
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} |
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throw new AssertionError("failed to do a \"full\" gc"); |
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} |
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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 = (long) (warmupSeconds * 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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if (warmupNanos > 0) forceFullGc(); |
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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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|
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private static void time(Job ... jobs) throws Throwable { |
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if (warmupSeconds > 0) 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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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private static double doubleArg(String[] args, String keyword, double defaultValue) { |
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String val = keywordValue(args, keyword); |
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return (val == null) ? defaultValue : Double.parseDouble(val); |
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} |
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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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|
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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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|
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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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|
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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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|
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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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public static void main(String[] args) throws Throwable { |
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final int iterations = intArg(args, "iterations", 100_000); |
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final int size = intArg(args, "size", 1000); |
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warmupSeconds = doubleArg(args, "warmup", 10); |
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final Pattern filter = patternArg(args, "filter"); |
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// System.out.printf( |
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// "iterations=%d size=%d, warmup=%1g, filter=\"%s\"%n", |
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// iterations, size, warmupSeconds, filter); |
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|
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final ConcurrentSkipListMap<Integer,Integer> m |
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= new ConcurrentSkipListMap<Integer,Integer>(); |
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final ArrayList<Integer> al = new ArrayList<Integer>(size); |
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|
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// Populate collections with random data |
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final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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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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al.add(rnd.nextInt(size)); |
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} |
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final Vector<Integer> v = new Vector<Integer>(al); |
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final ArrayDeque<Integer> ad = new ArrayDeque<Integer>(al); |
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// shuffle ArrayDeque elements so they wrap |
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for (int i = 0, n = rnd.nextInt(size); i < n; i++) |
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ad.addLast(ad.removeFirst()); |
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|
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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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|
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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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|
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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("descending 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 = size - 1; j >= 0; 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("ArrayDeque 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 : ad) |
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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 { |
| 387 |
for (int i = 0; i < iterations; i++) { |
| 388 |
int sum = 0; |
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ListIterator<Integer> it = al.listIterator(al.size()); |
| 390 |
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 { |
| 395 |
for (int i = 0; i < iterations; i++) { |
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int sum = 0; |
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ListIterator<Integer> it = al.listIterator(); |
| 398 |
while (it.hasNext()) |
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sum += it.next(); |
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check.sum(sum);}}}, |
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new Job("ArrayDeque descending iterator loop") { |
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public void work() throws Throwable { |
| 403 |
for (int i = 0; i < iterations; i++) { |
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int sum = 0; |
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Iterator<Integer> it = ad.descendingIterator(); |
| 406 |
while (it.hasNext()) |
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sum += it.next(); |
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check.sum(sum);}}}, |
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new Job("ArrayList.forEach") { |
| 410 |
public void work() throws Throwable { |
| 411 |
int[] sum = new int[1]; |
| 412 |
for (int i = 0; i < iterations; i++) { |
| 413 |
sum[0] = 0; |
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al.forEach(n -> sum[0] += n); |
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check.sum(sum[0]);}}}, |
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new Job("ArrayDeque.forEach") { |
| 417 |
public void work() throws Throwable { |
| 418 |
int[] sum = new int[1]; |
| 419 |
for (int i = 0; i < iterations; i++) { |
| 420 |
sum[0] = 0; |
| 421 |
ad.forEach(n -> sum[0] += n); |
| 422 |
check.sum(sum[0]);}}}, |
| 423 |
new Job("Vector.forEach") { |
| 424 |
public void work() throws Throwable { |
| 425 |
int[] sum = new int[1]; |
| 426 |
for (int i = 0; i < iterations; i++) { |
| 427 |
sum[0] = 0; |
| 428 |
v.forEach(n -> sum[0] += n); |
| 429 |
check.sum(sum[0]);}}}, |
| 430 |
new Job("ArrayList.iterator().forEachRemaining()") { |
| 431 |
public void work() throws Throwable { |
| 432 |
int[] sum = new int[1]; |
| 433 |
for (int i = 0; i < iterations; i++) { |
| 434 |
sum[0] = 0; |
| 435 |
al.iterator().forEachRemaining(n -> sum[0] += n); |
| 436 |
check.sum(sum[0]);}}}, |
| 437 |
new Job("ArrayDeque.descendingIterator().forEachRemaining()") { |
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public void work() throws Throwable { |
| 439 |
int[] sum = new int[1]; |
| 440 |
for (int i = 0; i < iterations; i++) { |
| 441 |
sum[0] = 0; |
| 442 |
ad.descendingIterator().forEachRemaining(n -> sum[0] += n); |
| 443 |
check.sum(sum[0]);}}}, |
| 444 |
new Job("ArrayDeque.iterator().forEachRemaining()") { |
| 445 |
public void work() throws Throwable { |
| 446 |
int[] sum = new int[1]; |
| 447 |
for (int i = 0; i < iterations; i++) { |
| 448 |
sum[0] = 0; |
| 449 |
ad.iterator().forEachRemaining(n -> sum[0] += n); |
| 450 |
check.sum(sum[0]);}}}, |
| 451 |
new Job("Vector.iterator().forEachRemaining()") { |
| 452 |
public void work() throws Throwable { |
| 453 |
int[] sum = new int[1]; |
| 454 |
for (int i = 0; i < iterations; i++) { |
| 455 |
sum[0] = 0; |
| 456 |
v.iterator().forEachRemaining(n -> sum[0] += n); |
| 457 |
check.sum(sum[0]);}}}, |
| 458 |
new Job("ArrayList.spliterator().forEachRemaining()") { |
| 459 |
public void work() throws Throwable { |
| 460 |
int[] sum = new int[1]; |
| 461 |
for (int i = 0; i < iterations; i++) { |
| 462 |
sum[0] = 0; |
| 463 |
al.spliterator().forEachRemaining(n -> sum[0] += n); |
| 464 |
check.sum(sum[0]);}}}, |
| 465 |
new Job("ArrayDeque.spliterator().forEachRemaining()") { |
| 466 |
public void work() throws Throwable { |
| 467 |
int[] sum = new int[1]; |
| 468 |
for (int i = 0; i < iterations; i++) { |
| 469 |
sum[0] = 0; |
| 470 |
ad.spliterator().forEachRemaining(n -> sum[0] += n); |
| 471 |
check.sum(sum[0]);}}}, |
| 472 |
new Job("Vector.spliterator().forEachRemaining()") { |
| 473 |
public void work() throws Throwable { |
| 474 |
int[] sum = new int[1]; |
| 475 |
for (int i = 0; i < iterations; i++) { |
| 476 |
sum[0] = 0; |
| 477 |
v.spliterator().forEachRemaining(n -> sum[0] += n); |
| 478 |
check.sum(sum[0]);}}}, |
| 479 |
new Job("ArrayList subList get loop") { |
| 480 |
public void work() throws Throwable { |
| 481 |
List<Integer> sl = asSubList(al); |
| 482 |
for (int i = 0; i < iterations; i++) { |
| 483 |
int sum = 0; |
| 484 |
int size = sl.size(); |
| 485 |
for (int j = 0; j < size; ++j) |
| 486 |
sum += sl.get(j); |
| 487 |
check.sum(sum);}}}, |
| 488 |
new Job("ArrayList subList iterate for loop") { |
| 489 |
public void work() throws Throwable { |
| 490 |
for (int i = 0; i < iterations; i++) { |
| 491 |
int sum = 0; |
| 492 |
for (Integer n : asSubList(al)) |
| 493 |
sum += n; |
| 494 |
check.sum(sum);}}}, |
| 495 |
new Job("ArrayList subList subList subList iterate for loop") { |
| 496 |
public void work() throws Throwable { |
| 497 |
for (int i = 0; i < iterations; i++) { |
| 498 |
int sum = 0; |
| 499 |
for (Integer n : asSubList(asSubList(asSubList(al)))) |
| 500 |
sum += n; |
| 501 |
check.sum(sum);}}}, |
| 502 |
new Job("ArrayList backwards wrapper ListIterator for loop") { |
| 503 |
public void work() throws Throwable { |
| 504 |
for (int i = 0; i < iterations; i++) { |
| 505 |
int sum = 0; |
| 506 |
for (Integer n : backwards(al)) |
| 507 |
sum += n; |
| 508 |
check.sum(sum);}}}, |
| 509 |
new Job("ArrayList backwards wrapper subList ListIterator for loop") { |
| 510 |
public void work() throws Throwable { |
| 511 |
for (int i = 0; i < iterations; i++) { |
| 512 |
int sum = 0; |
| 513 |
for (Integer n : backwards(asSubList(al))) |
| 514 |
sum += n; |
| 515 |
check.sum(sum);}}}, |
| 516 |
// new Job("ArrayList iterate desugared") { |
| 517 |
// public void work() throws Throwable { |
| 518 |
// for (int i = 0; i < iterations; i++) { |
| 519 |
// int sum = 0; |
| 520 |
// for (Iterator<Integer> it = al.iterator(); it.hasNext();) |
| 521 |
// sum += it.next(); |
| 522 |
// check.sum(sum);}}}, |
| 523 |
new Job("Short ArrayList get loop") { |
| 524 |
public void work() throws Throwable { |
| 525 |
for (int i = 0; i < (iterations * size / shortSize); i++) { |
| 526 |
int sum = 0; |
| 527 |
int size = sal.size(); |
| 528 |
for (int j = 0; j < size; ++j) |
| 529 |
sum += sal.get(j); |
| 530 |
shortCheck.sum(sum);}}}, |
| 531 |
new Job("Short ArrayList iterate for loop") { |
| 532 |
public void work() throws Throwable { |
| 533 |
for (int i = 0; i < (iterations * size / shortSize); i++) { |
| 534 |
int sum = 0; |
| 535 |
for (Integer n : sal) |
| 536 |
sum += n; |
| 537 |
shortCheck.sum(sum);}}}, |
| 538 |
new Job("Short ArrayList sublist iterate for loop") { |
| 539 |
public void work() throws Throwable { |
| 540 |
for (int i = 0; i < (iterations * size / shortSize); i++) { |
| 541 |
int sum = 0; |
| 542 |
for (Integer n : asSubList(sal)) |
| 543 |
sum += n; |
| 544 |
shortCheck.sum(sum);}}}, |
| 545 |
new Job("Vector ArrayList alternating iteration") { |
| 546 |
public void work() throws Throwable { |
| 547 |
for (int i = 0; i < iterations; i++) { |
| 548 |
int sum = 0; |
| 549 |
Iterator<Integer> it1 = v.iterator(); |
| 550 |
Iterator<Integer> it2 = al.iterator(); |
| 551 |
while (it1.hasNext()) |
| 552 |
sum += it1.next() + it2.next(); |
| 553 |
check.sum(sum/2);}}}, |
| 554 |
new Job("Vector ArrayList alternating invokeVirtual iteration") { |
| 555 |
public void work() throws Throwable { |
| 556 |
for (int i = 0; i < iterations; i++) { |
| 557 |
int sum = 0; |
| 558 |
List<Iterator<Integer>> its |
| 559 |
= new ArrayList<Iterator<Integer>>(2); |
| 560 |
its.add(v.iterator()); |
| 561 |
its.add(al.iterator()); |
| 562 |
for (int k = 0; its.get(k).hasNext(); k = (k == 0) ? 1 : 0) |
| 563 |
sum += its.get(k).next(); |
| 564 |
check.sum(sum/2);}}}, |
| 565 |
new Job("ConcurrentSkipListMap entrySet iterate") { |
| 566 |
public void work() throws Throwable { |
| 567 |
for (int i = 0; i < iterations; i++) { |
| 568 |
int sum = 0; |
| 569 |
for (Map.Entry<Integer,Integer> e : m.entrySet()) |
| 570 |
sum += e.getKey(); |
| 571 |
deoptimize(sum);}}} |
| 572 |
}; |
| 573 |
|
| 574 |
time(filter(filter, jobs)); |
| 575 |
} |
| 576 |
} |
