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jsr166 |
1.1 |
/* |
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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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* @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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jsr166 |
1.12 |
import static java.util.stream.Collectors.summingInt; |
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jsr166 |
1.1 |
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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jsr166 |
1.10 |
import java.util.Collections; |
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jsr166 |
1.1 |
import java.util.Deque; |
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import java.util.Enumeration; |
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import java.util.Iterator; |
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jsr166 |
1.13 |
import java.util.LinkedList; |
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jsr166 |
1.1 |
import java.util.List; |
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import java.util.ListIterator; |
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import java.util.Map; |
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jsr166 |
1.8 |
import java.util.PriorityQueue; |
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jsr166 |
1.1 |
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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jsr166 |
1.8 |
import java.util.concurrent.PriorityBlockingQueue; |
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jsr166 |
1.1 |
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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* 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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jsr166 |
1.11 |
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 filter; // 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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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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filter = patternArg(args, "filter"); |
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reverse = booleanArg(args, "reverse"); |
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shuffle = booleanArg(args, "shuffle"); |
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warmupNanos = (long) (warmupSeconds * (1000L * 1000L * 1000L)); |
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} |
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jsr166 |
1.1 |
|
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// --------------- GC finalization infrastructure --------------- |
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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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* 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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jsr166 |
1.9 |
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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jsr166 |
1.1 |
} |
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return nanoss; |
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} |
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void time(List<Job> jobs) throws Throwable { |
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jsr166 |
1.9 |
if (warmupNanos > 0) time0(jobs); // Warm up run |
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jsr166 |
1.1 |
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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final String nameHeader = "Method"; |
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final String millisHeader = "Millis"; |
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final String ratioHeader = "Ratio"; |
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int nameWidth = nameHeader.length(); |
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int millisWidth = millisHeader.length(); |
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int ratioWidth = ratioHeader.length(); |
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for (int i = 0; i < size; i++) { |
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nameWidth = Math.max(nameWidth, jobs.get(i).name().length()); |
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milliss[i] = nanoss[i]/(1000L * 1000L); |
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millisWidth = Math.max(millisWidth, |
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String.format("%d", milliss[i]).length()); |
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ratios[i] = (double) nanoss[i] / (double) nanoss[0]; |
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ratioWidth = Math.max(ratioWidth, |
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String.format("%.3f", ratios[i]).length()); |
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} |
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String format = String.format("%%-%ds %%%dd %%%d.3f%%n", |
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nameWidth, millisWidth, ratioWidth); |
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String headerFormat = String.format("%%-%ds %%%ds %%%ds%%n", |
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nameWidth, millisWidth, ratioWidth); |
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System.out.printf(headerFormat, "Method", "Millis", "Ratio"); |
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// Print out absolute and relative times, calibrated against first job |
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for (int i = 0; i < 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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private static String keywordValue(String[] args, String keyword) { |
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for (String arg : args) |
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if (arg.startsWith(keyword)) |
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return arg.substring(keyword.length() + 1); |
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return null; |
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} |
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private static int intArg(String[] args, String keyword, int defaultValue) { |
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String val = keywordValue(args, keyword); |
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return (val == null) ? defaultValue : Integer.parseInt(val); |
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} |
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private static 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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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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202 |
jsr166 |
1.10 |
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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209 |
jsr166 |
1.1 |
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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218 |
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private static void deoptimize(int sum) { |
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if (sum == 42) |
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System.out.println("the answer"); |
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} |
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private static <T> List<T> asSubList(List<T> list) { |
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return list.subList(0, list.size()); |
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} |
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private static <T> Iterable<T> backwards(final List<T> list) { |
228 |
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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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// Checks for correctness *and* prevents loop optimizations |
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class Check { |
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private int sum; |
240 |
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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) |
244 |
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throw new AssertionError("Sum mismatch"); |
245 |
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} |
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} |
247 |
jsr166 |
1.2 |
volatile Check check = new Check(); |
248 |
jsr166 |
1.1 |
|
249 |
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public static void main(String[] args) throws Throwable { |
250 |
jsr166 |
1.11 |
new IteratorMicroBenchmark(args).run(); |
251 |
jsr166 |
1.1 |
} |
252 |
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253 |
jsr166 |
1.11 |
void run() throws Throwable { |
254 |
jsr166 |
1.1 |
// System.out.printf( |
255 |
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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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258 |
jsr166 |
1.17 |
final ArrayList<Integer> al = new ArrayList<>(size); |
259 |
jsr166 |
1.1 |
|
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// Populate collections with random data |
261 |
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final ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
262 |
jsr166 |
1.3 |
for (int i = 0; i < size; i++) |
263 |
jsr166 |
1.1 |
al.add(rnd.nextInt(size)); |
264 |
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265 |
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final ArrayDeque<Integer> ad = new ArrayDeque<>(al); |
266 |
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final ArrayBlockingQueue<Integer> abq = new ArrayBlockingQueue<>(al.size()); |
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abq.addAll(al); |
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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()); |
273 |
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} |
274 |
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275 |
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ArrayList<Job> jobs = new ArrayList<>(Arrays.asList()); |
276 |
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277 |
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List.of(al, ad, abq, |
278 |
jsr166 |
1.13 |
new LinkedList<>(al), |
279 |
jsr166 |
1.8 |
new PriorityQueue<>(al), |
280 |
jsr166 |
1.1 |
new Vector<>(al), |
281 |
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new ConcurrentLinkedQueue<>(al), |
282 |
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new ConcurrentLinkedDeque<>(al), |
283 |
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new LinkedBlockingQueue<>(al), |
284 |
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new LinkedBlockingDeque<>(al), |
285 |
jsr166 |
1.8 |
new LinkedTransferQueue<>(al), |
286 |
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new PriorityBlockingQueue<>(al)) |
287 |
jsr166 |
1.1 |
.stream() |
288 |
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.forEach(x -> { |
289 |
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jobs.addAll(collectionJobs(x)); |
290 |
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if (x instanceof Deque) |
291 |
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jobs.addAll(dequeJobs((Deque<Integer>)x)); |
292 |
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}); |
293 |
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|
294 |
jsr166 |
1.11 |
if (reverse) Collections.reverse(jobs); |
295 |
jsr166 |
1.10 |
if (shuffle) Collections.shuffle(jobs); |
296 |
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297 |
jsr166 |
1.1 |
time(filter(filter, jobs)); |
298 |
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} |
299 |
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300 |
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List<Job> collectionJobs(Collection<Integer> x) { |
301 |
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String klazz = x.getClass().getSimpleName(); |
302 |
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return List.of( |
303 |
jsr166 |
1.5 |
new Job(klazz + " iterate for loop") { |
304 |
jsr166 |
1.1 |
public void work() throws Throwable { |
305 |
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for (int i = 0; i < iterations; i++) { |
306 |
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int sum = 0; |
307 |
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for (Integer n : x) |
308 |
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sum += n; |
309 |
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check.sum(sum);}}}, |
310 |
jsr166 |
1.18 |
new Job(klazz + " iterator().forEachRemaining()") { |
311 |
jsr166 |
1.1 |
public void work() throws Throwable { |
312 |
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int[] sum = new int[1]; |
313 |
|
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for (int i = 0; i < iterations; i++) { |
314 |
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sum[0] = 0; |
315 |
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x.iterator().forEachRemaining(n -> sum[0] += n); |
316 |
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check.sum(sum[0]);}}}, |
317 |
jsr166 |
1.18 |
new Job(klazz + " spliterator().tryAdvance()") { |
318 |
jsr166 |
1.1 |
public void work() throws Throwable { |
319 |
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int[] sum = new int[1]; |
320 |
|
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for (int i = 0; i < iterations; i++) { |
321 |
|
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sum[0] = 0; |
322 |
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Spliterator<Integer> spliterator = x.spliterator(); |
323 |
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do {} while (spliterator.tryAdvance(n -> sum[0] += n)); |
324 |
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check.sum(sum[0]);}}}, |
325 |
jsr166 |
1.18 |
new Job(klazz + " spliterator().forEachRemaining()") { |
326 |
jsr166 |
1.1 |
public void work() throws Throwable { |
327 |
|
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int[] sum = new int[1]; |
328 |
|
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for (int i = 0; i < iterations; i++) { |
329 |
|
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sum[0] = 0; |
330 |
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x.spliterator().forEachRemaining(n -> sum[0] += n); |
331 |
|
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check.sum(sum[0]);}}}, |
332 |
jsr166 |
1.18 |
new Job(klazz + " removeIf") { |
333 |
jsr166 |
1.1 |
public void work() throws Throwable { |
334 |
|
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int[] sum = new int[1]; |
335 |
|
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for (int i = 0; i < iterations; i++) { |
336 |
|
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sum[0] = 0; |
337 |
jsr166 |
1.16 |
if (x.removeIf(n -> { sum[0] += n; return false; })) |
338 |
|
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throw new AssertionError(); |
339 |
jsr166 |
1.1 |
check.sum(sum[0]);}}}, |
340 |
jsr166 |
1.18 |
new Job(klazz + " contains") { |
341 |
jsr166 |
1.14 |
public void work() throws Throwable { |
342 |
|
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int[] sum = new int[1]; |
343 |
jsr166 |
1.15 |
Object y = new Object() { |
344 |
|
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public boolean equals(Object z) { |
345 |
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sum[0] += (int) z; return false; }}; |
346 |
jsr166 |
1.14 |
for (int i = 0; i < iterations; i++) { |
347 |
|
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sum[0] = 0; |
348 |
jsr166 |
1.16 |
if (x.contains(y)) throw new AssertionError(); |
349 |
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check.sum(sum[0]);}}}, |
350 |
jsr166 |
1.18 |
new Job(klazz + " remove(Object)") { |
351 |
jsr166 |
1.16 |
public void work() throws Throwable { |
352 |
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int[] sum = new int[1]; |
353 |
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Object y = new Object() { |
354 |
|
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public boolean equals(Object z) { |
355 |
|
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sum[0] += (int) z; return false; }}; |
356 |
|
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for (int i = 0; i < iterations; i++) { |
357 |
|
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sum[0] = 0; |
358 |
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if (x.remove(y)) throw new AssertionError(); |
359 |
jsr166 |
1.14 |
check.sum(sum[0]);}}}, |
360 |
jsr166 |
1.18 |
new Job(klazz + " forEach") { |
361 |
jsr166 |
1.1 |
public void work() throws Throwable { |
362 |
|
|
int[] sum = new int[1]; |
363 |
|
|
for (int i = 0; i < iterations; i++) { |
364 |
|
|
sum[0] = 0; |
365 |
|
|
x.forEach(n -> sum[0] += n); |
366 |
jsr166 |
1.6 |
check.sum(sum[0]);}}}, |
367 |
jsr166 |
1.18 |
new Job(klazz + " toArray()") { |
368 |
jsr166 |
1.6 |
public void work() throws Throwable { |
369 |
|
|
int[] sum = new int[1]; |
370 |
|
|
for (int i = 0; i < iterations; i++) { |
371 |
|
|
sum[0] = 0; |
372 |
|
|
for (Object o : x.toArray()) |
373 |
|
|
sum[0] += (Integer) o; |
374 |
|
|
check.sum(sum[0]);}}}, |
375 |
jsr166 |
1.18 |
new Job(klazz + " toArray(a)") { |
376 |
jsr166 |
1.6 |
public void work() throws Throwable { |
377 |
|
|
Integer[] a = new Integer[x.size()]; |
378 |
|
|
int[] sum = new int[1]; |
379 |
|
|
for (int i = 0; i < iterations; i++) { |
380 |
|
|
sum[0] = 0; |
381 |
|
|
x.toArray(a); |
382 |
|
|
for (Object o : a) |
383 |
|
|
sum[0] += (Integer) o; |
384 |
jsr166 |
1.7 |
check.sum(sum[0]);}}}, |
385 |
jsr166 |
1.18 |
new Job(klazz + " toArray(empty)") { |
386 |
jsr166 |
1.7 |
public void work() throws Throwable { |
387 |
|
|
Integer[] empty = new Integer[0]; |
388 |
|
|
int[] sum = new int[1]; |
389 |
|
|
for (int i = 0; i < iterations; i++) { |
390 |
|
|
sum[0] = 0; |
391 |
|
|
for (Integer o : x.toArray(empty)) |
392 |
|
|
sum[0] += o; |
393 |
jsr166 |
1.12 |
check.sum(sum[0]);}}}, |
394 |
jsr166 |
1.18 |
new Job(klazz + " stream().collect") { |
395 |
jsr166 |
1.12 |
public void work() throws Throwable { |
396 |
|
|
for (int i = 0; i < iterations; i++) { |
397 |
|
|
check.sum(x.stream() |
398 |
|
|
.collect(summingInt(e -> e)));}}}, |
399 |
jsr166 |
1.18 |
new Job(klazz + " parallelStream().collect") { |
400 |
jsr166 |
1.12 |
public void work() throws Throwable { |
401 |
|
|
for (int i = 0; i < iterations; i++) { |
402 |
|
|
check.sum(x.parallelStream() |
403 |
|
|
.collect(summingInt(e -> e)));}}}); |
404 |
jsr166 |
1.1 |
} |
405 |
|
|
|
406 |
|
|
List<Job> dequeJobs(Deque<Integer> x) { |
407 |
|
|
String klazz = x.getClass().getSimpleName(); |
408 |
|
|
return List.of( |
409 |
jsr166 |
1.18 |
new Job(klazz + " descendingIterator() loop") { |
410 |
jsr166 |
1.1 |
public void work() throws Throwable { |
411 |
|
|
for (int i = 0; i < iterations; i++) { |
412 |
|
|
int sum = 0; |
413 |
|
|
Iterator<Integer> it = x.descendingIterator(); |
414 |
|
|
while (it.hasNext()) |
415 |
|
|
sum += it.next(); |
416 |
|
|
check.sum(sum);}}}, |
417 |
jsr166 |
1.18 |
new Job(klazz + " descendingIterator().forEachRemaining()") { |
418 |
jsr166 |
1.1 |
public void work() throws Throwable { |
419 |
|
|
int[] sum = new int[1]; |
420 |
|
|
for (int i = 0; i < iterations; i++) { |
421 |
|
|
sum[0] = 0; |
422 |
|
|
x.descendingIterator().forEachRemaining(n -> sum[0] += n); |
423 |
|
|
check.sum(sum[0]);}}}); |
424 |
|
|
} |
425 |
|
|
} |