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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 static java.util.stream.Collectors.summingInt; |
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import static java.util.stream.Collectors.toCollection; |
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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.Collection; |
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import java.util.Collections; |
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import java.util.Deque; |
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import java.util.HashMap; |
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import java.util.Iterator; |
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import java.util.LinkedList; |
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import java.util.List; |
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import java.util.ListIterator; |
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import java.util.PriorityQueue; |
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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.CopyOnWriteArrayList; |
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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.PriorityBlockingQueue; |
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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.concurrent.atomic.LongAdder; |
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import java.util.regex.Pattern; |
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import java.util.stream.Stream; |
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import java.util.function.ToIntFunction; |
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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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final int iterations; |
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final int size; // number of elements in collections |
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final double warmupSeconds; |
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final long warmupNanos; |
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final Pattern nameFilter; // select subset of Jobs to run |
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final boolean reverse; // reverse order of Jobs |
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final boolean shuffle; // randomize order of Jobs |
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|
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IteratorMicroBenchmark(String[] args) { |
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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", 7.0); |
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nameFilter = patternArg(args, "filter"); |
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reverse = booleanArg(args, "reverse"); |
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shuffle = booleanArg(args, "shuffle"); |
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|
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warmupNanos = (long) (warmupSeconds * (1000L * 1000L * 1000L)); |
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} |
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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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@SuppressWarnings("deprecation") |
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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 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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Job job = jobs.get(i); |
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long totalTime; |
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int runs = 0; |
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long startTime = System.nanoTime(); |
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do { job.work(); runs++; } |
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while ((totalTime = System.nanoTime() - startTime) < warmupNanos); |
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nanoss[i] = totalTime/runs; |
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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 (warmupNanos > 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 boolean booleanArg(String[] args, String keyword) { |
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String val = keywordValue(args, keyword); |
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if (val == null || val.equals("false")) return false; |
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if (val.equals("true")) return true; |
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throw new IllegalArgumentException(val); |
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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> 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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static 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(args).run(); |
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} |
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|
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HashMap<Class<?>, String> goodClassName = new HashMap<>(); |
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|
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String goodClassName(Class<?> klazz) { |
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return goodClassName.computeIfAbsent( |
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klazz, |
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k -> { |
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String simple = k.getSimpleName(); |
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return (simple.equals("SubList")) // too simple! |
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? k.getName().replaceFirst(".*\\.", "") |
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: simple; |
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}); |
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} |
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|
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static List<Integer> makeSubList(List<Integer> list) { |
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final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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int size = list.size(); |
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if (size <= 2) return list.subList(0, size); |
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List<Integer> subList = list.subList(rnd.nextInt(0, 2), |
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size - rnd.nextInt(0, 2)); |
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List<Integer> copy = new ArrayList<>(list); |
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subList.clear(); |
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subList.addAll(copy); |
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return subList; |
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} |
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|
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void run() throws Throwable { |
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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, nameFilter); |
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|
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final ArrayList<Integer> al = new ArrayList<>(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 = Stream.<Collection<Integer>>of( |
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al, ad, abq, |
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makeSubList(new ArrayList<>(al)), |
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new LinkedList<>(al), |
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makeSubList(new LinkedList<>(al)), |
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new PriorityQueue<>(al), |
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new Vector<>(al), |
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makeSubList(new Vector<>(al)), |
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new CopyOnWriteArrayList<>(al), |
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makeSubList(new CopyOnWriteArrayList<>(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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new PriorityBlockingQueue<>(al)) |
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.flatMap(x -> jobs(x)) |
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.filter(job -> |
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nameFilter == null || nameFilter.matcher(job.name()).find()) |
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.collect(toCollection(ArrayList::new)); |
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|
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if (reverse) Collections.reverse(jobs); |
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if (shuffle) Collections.shuffle(jobs); |
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|
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time(jobs); |
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} |
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|
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@SafeVarargs @SuppressWarnings("varargs") |
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private <T> Stream<T> concatStreams(Stream<T> ... streams) { |
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return Stream.of(streams).flatMap(s -> s); |
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} |
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|
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Stream<Job> jobs(Collection<Integer> x) { |
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return concatStreams( |
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collectionJobs(x), |
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(x instanceof Deque) |
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? dequeJobs((Deque<Integer>)x) |
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: Stream.empty(), |
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(x instanceof List) |
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? listJobs((List<Integer>)x) |
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: Stream.empty()); |
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} |
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|
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Object sneakyAdder(int[] sneakySum) { |
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return new Object() { |
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public int hashCode() { throw new AssertionError(); } |
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public boolean equals(Object z) { |
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sneakySum[0] += (int) z; return false; }}; |
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} |
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|
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Stream<Job> collectionJobs(Collection<Integer> x) { |
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final String klazz = goodClassName(x.getClass()); |
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return Stream.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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if (x.removeIf(n -> { sum[0] += n; return false; })) |
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throw new AssertionError(); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " contains") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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Object sneakyAdder = sneakyAdder(sum); |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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if (x.contains(sneakyAdder)) throw new AssertionError(); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " remove(Object)") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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Object sneakyAdder = sneakyAdder(sum); |
| 392 |
for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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if (x.remove(sneakyAdder)) throw new AssertionError(); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " forEach") { |
| 397 |
public void work() throws Throwable { |
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int[] sum = new int[1]; |
| 399 |
for (int i = 0; i < iterations; i++) { |
| 400 |
sum[0] = 0; |
| 401 |
x.forEach(n -> sum[0] += n); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " toArray()") { |
| 404 |
public void work() throws Throwable { |
| 405 |
int[] sum = new int[1]; |
| 406 |
for (int i = 0; i < iterations; i++) { |
| 407 |
sum[0] = 0; |
| 408 |
for (Object o : x.toArray()) |
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sum[0] += (Integer) o; |
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check.sum(sum[0]);}}}, |
| 411 |
new Job(klazz + " toArray(a)") { |
| 412 |
public void work() throws Throwable { |
| 413 |
Integer[] a = new Integer[x.size()]; |
| 414 |
int[] sum = new int[1]; |
| 415 |
for (int i = 0; i < iterations; i++) { |
| 416 |
sum[0] = 0; |
| 417 |
x.toArray(a); |
| 418 |
for (Object o : a) |
| 419 |
sum[0] += (Integer) o; |
| 420 |
check.sum(sum[0]);}}}, |
| 421 |
new Job(klazz + " toArray(empty)") { |
| 422 |
public void work() throws Throwable { |
| 423 |
Integer[] empty = new Integer[0]; |
| 424 |
int[] sum = new int[1]; |
| 425 |
for (int i = 0; i < iterations; i++) { |
| 426 |
sum[0] = 0; |
| 427 |
for (Integer o : x.toArray(empty)) |
| 428 |
sum[0] += o; |
| 429 |
check.sum(sum[0]);}}}, |
| 430 |
new Job(klazz + " stream().forEach") { |
| 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 |
x.stream().forEach(n -> sum[0] += n); |
| 436 |
check.sum(sum[0]);}}}, |
| 437 |
new Job(klazz + " stream().mapToInt") { |
| 438 |
public void work() throws Throwable { |
| 439 |
for (int i = 0; i < iterations; i++) { |
| 440 |
check.sum(x.stream().mapToInt(e -> e).sum());}}}, |
| 441 |
new Job(klazz + " stream().collect") { |
| 442 |
public void work() throws Throwable { |
| 443 |
for (int i = 0; i < iterations; i++) { |
| 444 |
check.sum(x.stream() |
| 445 |
.collect(summingInt(e -> e)));}}}, |
| 446 |
new Job(klazz + " stream()::iterator") { |
| 447 |
public void work() throws Throwable { |
| 448 |
int[] sum = new int[1]; |
| 449 |
for (int i = 0; i < iterations; i++) { |
| 450 |
sum[0] = 0; |
| 451 |
for (Integer o : (Iterable<Integer>) x.stream()::iterator) |
| 452 |
sum[0] += o; |
| 453 |
check.sum(sum[0]);}}}, |
| 454 |
new Job(klazz + " parallelStream().forEach") { |
| 455 |
public void work() throws Throwable { |
| 456 |
for (int i = 0; i < iterations; i++) { |
| 457 |
LongAdder sum = new LongAdder(); |
| 458 |
x.parallelStream().forEach(n -> sum.add(n)); |
| 459 |
check.sum((int) sum.sum());}}}, |
| 460 |
new Job(klazz + " parallelStream().mapToInt") { |
| 461 |
public void work() throws Throwable { |
| 462 |
for (int i = 0; i < iterations; i++) { |
| 463 |
check.sum(x.parallelStream().mapToInt(e -> e).sum());}}}, |
| 464 |
new Job(klazz + " parallelStream().collect") { |
| 465 |
public void work() throws Throwable { |
| 466 |
for (int i = 0; i < iterations; i++) { |
| 467 |
check.sum(x.parallelStream() |
| 468 |
.collect(summingInt(e -> e)));}}}, |
| 469 |
new Job(klazz + " parallelStream()::iterator") { |
| 470 |
public void work() throws Throwable { |
| 471 |
int[] sum = new int[1]; |
| 472 |
for (int i = 0; i < iterations; i++) { |
| 473 |
sum[0] = 0; |
| 474 |
for (Integer o : (Iterable<Integer>) x.parallelStream()::iterator) |
| 475 |
sum[0] += o; |
| 476 |
check.sum(sum[0]);}}}); |
| 477 |
} |
| 478 |
|
| 479 |
Stream<Job> dequeJobs(Deque<Integer> x) { |
| 480 |
String klazz = goodClassName(x.getClass()); |
| 481 |
return Stream.of( |
| 482 |
new Job(klazz + " descendingIterator() loop") { |
| 483 |
public void work() throws Throwable { |
| 484 |
for (int i = 0; i < iterations; i++) { |
| 485 |
int sum = 0; |
| 486 |
Iterator<Integer> it = x.descendingIterator(); |
| 487 |
while (it.hasNext()) |
| 488 |
sum += it.next(); |
| 489 |
check.sum(sum);}}}, |
| 490 |
new Job(klazz + " descendingIterator().forEachRemaining()") { |
| 491 |
public void work() throws Throwable { |
| 492 |
int[] sum = new int[1]; |
| 493 |
for (int i = 0; i < iterations; i++) { |
| 494 |
sum[0] = 0; |
| 495 |
x.descendingIterator().forEachRemaining(n -> sum[0] += n); |
| 496 |
check.sum(sum[0]);}}}); |
| 497 |
} |
| 498 |
|
| 499 |
<T> Job iterateJob(String name, T x, ToIntFunction<T> sumFunction) { |
| 500 |
return new Job(name) { |
| 501 |
public void work() throws Throwable { |
| 502 |
for (int i = 0; i < iterations; i++) { |
| 503 |
check.sum(sumFunction.applyAsInt(x));}}}; |
| 504 |
} |
| 505 |
|
| 506 |
Stream<Job> listJobs(List<Integer> x) { |
| 507 |
final String klazz = goodClassName(x.getClass()); |
| 508 |
final int[] sneakySum = new int[1]; |
| 509 |
final Object sneakyAdder = sneakyAdder(sneakySum); |
| 510 |
|
| 511 |
return Stream.of( |
| 512 |
iterateJob( |
| 513 |
klazz + " indexOf", x, |
| 514 |
z -> { |
| 515 |
sneakySum[0] = 0; |
| 516 |
if (z.indexOf(sneakyAdder) != -1) throw new AssertionError(); |
| 517 |
return sneakySum[0]; }), |
| 518 |
iterateJob( |
| 519 |
klazz + " lastIndexOf", x, |
| 520 |
z -> { |
| 521 |
sneakySum[0] = 0; |
| 522 |
if (z.lastIndexOf(sneakyAdder) != -1) throw new AssertionError(); |
| 523 |
return sneakySum[0]; })); |
| 524 |
} |
| 525 |
} |
