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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.Arrays; |
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import java.util.ArrayList; |
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import java.util.Collection; |
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import java.util.Deque; |
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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.Spliterator; |
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import java.util.Vector; |
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import java.util.concurrent.ArrayBlockingQueue; |
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import java.util.concurrent.ConcurrentLinkedDeque; |
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import java.util.concurrent.ConcurrentLinkedQueue; |
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import java.util.concurrent.LinkedBlockingDeque; |
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import java.util.concurrent.LinkedBlockingQueue; |
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import java.util.concurrent.LinkedTransferQueue; |
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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 program runs for a very long time. |
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* For faster runs, restrict execution using command line args. |
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* |
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* This is an interface based version of ArrayList/IteratorMicroBenchmark |
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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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int iterations; |
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int size; |
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double warmupSeconds; |
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Pattern filter; |
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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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long[] time0(List<Job> jobs) throws Throwable { |
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final long warmupNanos = (long) (warmupSeconds * 1000L * 1000L * 1000L); |
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final int size = jobs.size(); |
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long[] nanoss = new long[size]; |
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for (int i = 0; i < size; 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.get(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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void time(List<Job> jobs) throws Throwable { |
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if (warmupSeconds > 0) time0(jobs); // Warm up run |
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final int size = jobs.size(); |
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final long[] nanoss = time0(jobs); // Real timing run |
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final long[] milliss = new long[size]; |
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final double[] ratios = new double[size]; |
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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 < size; i++) { |
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nameWidth = Math.max(nameWidth, jobs.get(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 < size; i++) |
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System.out.printf(format, jobs.get(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 List<Job> filter(Pattern filter, List<Job> jobs) { |
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if (filter == null) return jobs; |
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ArrayList<Job> newJobs = new ArrayList<>(); |
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for (Job job : jobs) |
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if (filter.matcher(job.name()).find()) |
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newJobs.add(job); |
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return newJobs; |
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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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// 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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volatile Check check = new Check(); |
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|
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public static void main(String[] args) throws Throwable { |
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new IteratorMicroBenchmark().run(args); |
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} |
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|
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void run(String[] args) throws Throwable { |
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iterations = intArg(args, "iterations", 10_000); |
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size = intArg(args, "size", 1000); |
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warmupSeconds = doubleArg(args, "warmup", 5); |
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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 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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al.add(rnd.nextInt(size)); |
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|
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final ArrayDeque<Integer> ad = new ArrayDeque<>(al); |
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final ArrayBlockingQueue<Integer> abq = new ArrayBlockingQueue<>(al.size()); |
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abq.addAll(al); |
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|
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// shuffle circular array 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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abq.add(abq.remove()); |
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} |
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|
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ArrayList<Job> jobs = new ArrayList<>(Arrays.asList()); |
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|
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List.of(al, ad, abq, |
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new Vector<>(al), |
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new ConcurrentLinkedQueue<>(al), |
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new ConcurrentLinkedDeque<>(al), |
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new LinkedBlockingQueue<>(al), |
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new LinkedBlockingDeque<>(al), |
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new LinkedTransferQueue<>(al)) |
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.stream() |
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.forEach(x -> { |
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jobs.addAll(collectionJobs(x)); |
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if (x instanceof Deque) |
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jobs.addAll(dequeJobs((Deque<Integer>)x)); |
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}); |
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|
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time(filter(filter, jobs)); |
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} |
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|
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List<Job> collectionJobs(Collection<Integer> x) { |
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String klazz = x.getClass().getSimpleName(); |
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return List.of( |
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new Job(klazz + " 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 : x) |
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sum += n; |
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check.sum(sum);}}}, |
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new Job(klazz + " .iterator().forEachRemaining()") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.iterator().forEachRemaining(n -> sum[0] += n); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .spliterator().tryAdvance()") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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Spliterator<Integer> spliterator = x.spliterator(); |
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do {} while (spliterator.tryAdvance(n -> sum[0] += n)); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .spliterator().forEachRemaining()") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.spliterator().forEachRemaining(n -> sum[0] += n); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .removeIf") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.removeIf(n -> { sum[0] += n; return false; }); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .forEach") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.forEach(n -> sum[0] += n); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .toArray()") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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for (Object o : x.toArray()) |
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sum[0] += (Integer) o; |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " .toArray(a)") { |
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public void work() throws Throwable { |
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Integer[] a = new Integer[x.size()]; |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.toArray(a); |
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for (Object o : a) |
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sum[0] += (Integer) o; |
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check.sum(sum[0]);}}}); |
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} |
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|
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List<Job> dequeJobs(Deque<Integer> x) { |
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String klazz = x.getClass().getSimpleName(); |
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return List.of( |
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new Job(klazz + " .descendingIterator() 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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Iterator<Integer> it = x.descendingIterator(); |
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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(klazz + " .descendingIterator().forEachRemaining()") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.descendingIterator().forEachRemaining(n -> sum[0] += n); |
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check.sum(sum[0]);}}}); |
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} |
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} |
