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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 RemoveMicroBenchmark iterations=1 size=8 warmup=0 |
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*/ |
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|
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import static java.util.concurrent.TimeUnit.MILLISECONDS; |
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import static java.util.stream.Collectors.toCollection; |
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|
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import java.lang.ref.ReferenceQueue; |
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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.Queue; |
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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.BlockingDeque; |
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import java.util.concurrent.BlockingQueue; |
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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.CountDownLatch; |
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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.ThreadLocalRandom; |
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import java.util.concurrent.TimeUnit; |
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import java.util.regex.Pattern; |
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import java.util.stream.Stream; |
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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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* @author Martin Buchholz |
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*/ |
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public class RemoveMicroBenchmark { |
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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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public void run() { |
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try { work(); } |
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catch (Throwable ex) { |
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// current job cannot always be deduced from stacktrace. |
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throw new RuntimeException("Job failed: " + name(), ex); |
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} |
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} |
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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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final ArrayList<Integer> elements; // contains size random Integers |
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|
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RemoveMicroBenchmark(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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elements = ThreadLocalRandom.current().ints(size) |
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.mapToObj(x -> x) |
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.collect(toCollection(ArrayList::new)); |
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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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long timeoutMillis = 1000L; |
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CountDownLatch finalized = new CountDownLatch(1); |
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ReferenceQueue<Object> queue = new ReferenceQueue<>(); |
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WeakReference<Object> ref = new WeakReference<>( |
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new Object() { protected void finalize() { finalized.countDown(); }}, |
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queue); |
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try { |
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for (int tries = 3; tries--> 0; ) { |
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System.gc(); |
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if (finalized.await(timeoutMillis, MILLISECONDS) |
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&& queue.remove(timeoutMillis) != null |
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&& 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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timeoutMillis *= 4; |
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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) { |
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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.run(); 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 RemoveMicroBenchmark(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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String goodClassName(Object x) { |
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return goodClassName(x.getClass()); |
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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 = rnd.nextInt(4); |
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for (int i = size; i--> 0; ) |
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list.add(rnd.nextInt()); |
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int index = rnd.nextInt(size + 1); |
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return list.subList(index, index); |
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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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@SafeVarargs @SuppressWarnings("varargs") |
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private static <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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Class<?> topLevelClass(Object x) { |
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for (Class<?> k = x.getClass();; ) { |
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Class<?> enclosing = k.getEnclosingClass(); |
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if (enclosing == null) |
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return k; |
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k = enclosing; |
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} |
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} |
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|
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void run() throws Throwable { |
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ArrayList<Job> jobs = Stream.<Collection<Integer>>of( |
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new ArrayList<>(), |
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makeSubList(new ArrayList<>()), |
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new LinkedList<>(), |
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makeSubList(new LinkedList<>()), |
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new Vector<>(), |
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makeSubList(new Vector<>()), |
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new CopyOnWriteArrayList<>(), |
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makeSubList(new CopyOnWriteArrayList<>()), |
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new ArrayDeque<>(), |
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new PriorityQueue<>(), |
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new ArrayBlockingQueue<>(elements.size()), |
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new ConcurrentLinkedQueue<>(), |
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new ConcurrentLinkedDeque<>(), |
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new LinkedBlockingQueue<>(), |
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new LinkedBlockingDeque<>(), |
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new LinkedTransferQueue<>(), |
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new PriorityBlockingQueue<>()) |
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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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Stream<Job> jobs(Collection<Integer> x) { |
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return concatStreams( |
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collectionJobs(x), |
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|
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(CopyOnWriteArrayList.class.isAssignableFrom(topLevelClass(x))) |
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? Stream.empty() |
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: iteratorRemoveJobs(x), |
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|
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(x instanceof Queue) |
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? queueJobs((Queue<Integer>)x) |
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: Stream.empty(), |
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|
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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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|
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(x instanceof BlockingQueue) |
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? blockingQueueJobs((BlockingQueue<Integer>)x) |
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: Stream.empty(), |
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|
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(x instanceof BlockingDeque) |
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? blockingDequeJobs((BlockingDeque<Integer>)x) |
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: Stream.empty()); |
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} |
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|
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Collection<Integer> universeRecorder(int[] sum) { |
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return new ArrayList<>() { |
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public boolean contains(Object x) { |
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sum[0] += (Integer) x; |
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return true; |
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}}; |
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} |
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|
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Collection<Integer> emptyRecorder(int[] sum) { |
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return new ArrayList<>() { |
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public boolean contains(Object x) { |
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sum[0] += (Integer) x; |
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return false; |
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}}; |
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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); |
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return Stream.of( |
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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.addAll(elements); |
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x.removeIf(n -> { sum[0] += n; return true; }); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " removeIf rnd-two-pass") { |
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public void work() throws Throwable { |
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ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
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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.addAll(elements); |
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x.removeIf(n -> { |
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boolean b = rnd.nextBoolean(); |
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if (b) sum[0] += n; |
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return b; }); |
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x.removeIf(n -> { sum[0] += n; return true; }); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " removeAll") { |
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public void work() throws Throwable { |
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int[] sum = new int[1]; |
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Collection<Integer> universe = universeRecorder(sum); |
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for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.addAll(elements); |
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x.removeAll(universe); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " retainAll") { |
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public void work() throws Throwable { |
| 410 |
int[] sum = new int[1]; |
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Collection<Integer> empty = emptyRecorder(sum); |
| 412 |
for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.addAll(elements); |
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x.retainAll(empty); |
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check.sum(sum[0]);}}}, |
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new Job(klazz + " clear") { |
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public void work() throws Throwable { |
| 419 |
int[] sum = new int[1]; |
| 420 |
for (int i = 0; i < iterations; i++) { |
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sum[0] = 0; |
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x.addAll(elements); |
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x.forEach(e -> sum[0] += e); |
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x.clear(); |
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check.sum(sum[0]);}}}); |
| 426 |
} |
| 427 |
|
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Stream<Job> iteratorRemoveJobs(Collection<Integer> x) { |
| 429 |
final String klazz = goodClassName(x); |
| 430 |
return Stream.of( |
| 431 |
new Job(klazz + " Iterator.remove") { |
| 432 |
public void work() throws Throwable { |
| 433 |
int[] sum = new int[1]; |
| 434 |
for (int i = 0; i < iterations; i++) { |
| 435 |
sum[0] = 0; |
| 436 |
x.addAll(elements); |
| 437 |
Iterator<Integer> it = x.iterator(); |
| 438 |
while (it.hasNext()) { |
| 439 |
sum[0] += it.next(); |
| 440 |
it.remove(); |
| 441 |
} |
| 442 |
check.sum(sum[0]);}}}, |
| 443 |
new Job(klazz + " Iterator.remove-rnd-two-pass") { |
| 444 |
public void work() throws Throwable { |
| 445 |
ThreadLocalRandom rnd = ThreadLocalRandom.current(); |
| 446 |
int[] sum = new int[1]; |
| 447 |
for (int i = 0; i < iterations; i++) { |
| 448 |
sum[0] = 0; |
| 449 |
x.addAll(elements); |
| 450 |
for (Iterator<Integer> it = x.iterator(); |
| 451 |
it.hasNext(); ) { |
| 452 |
Integer e = it.next(); |
| 453 |
if (rnd.nextBoolean()) { |
| 454 |
sum[0] += e; |
| 455 |
it.remove(); |
| 456 |
} |
| 457 |
} |
| 458 |
for (Iterator<Integer> it = x.iterator(); |
| 459 |
it.hasNext(); ) { |
| 460 |
sum[0] += it.next(); |
| 461 |
it.remove(); |
| 462 |
} |
| 463 |
check.sum(sum[0]);}}}); |
| 464 |
} |
| 465 |
|
| 466 |
Stream<Job> queueJobs(Queue<Integer> x) { |
| 467 |
final String klazz = goodClassName(x); |
| 468 |
return Stream.of( |
| 469 |
new Job(klazz + " poll()") { |
| 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 |
x.addAll(elements); |
| 475 |
for (Integer e; (e = x.poll()) != null; ) |
| 476 |
sum[0] += e; |
| 477 |
check.sum(sum[0]);}}}); |
| 478 |
} |
| 479 |
|
| 480 |
Stream<Job> dequeJobs(Deque<Integer> x) { |
| 481 |
final String klazz = goodClassName(x); |
| 482 |
return Stream.of( |
| 483 |
new Job(klazz + " descendingIterator().remove") { |
| 484 |
public void work() throws Throwable { |
| 485 |
int[] sum = new int[1]; |
| 486 |
for (int i = 0; i < iterations; i++) { |
| 487 |
sum[0] = 0; |
| 488 |
x.addAll(elements); |
| 489 |
Iterator<Integer> it = x.descendingIterator(); |
| 490 |
while (it.hasNext()) { |
| 491 |
sum[0] += it.next(); |
| 492 |
it.remove(); |
| 493 |
} |
| 494 |
check.sum(sum[0]);}}}, |
| 495 |
new Job(klazz + " pollFirst()") { |
| 496 |
public void work() throws Throwable { |
| 497 |
int[] sum = new int[1]; |
| 498 |
for (int i = 0; i < iterations; i++) { |
| 499 |
sum[0] = 0; |
| 500 |
x.addAll(elements); |
| 501 |
for (Integer e; (e = x.pollFirst()) != null; ) |
| 502 |
sum[0] += e; |
| 503 |
check.sum(sum[0]);}}}, |
| 504 |
new Job(klazz + " pollLast()") { |
| 505 |
public void work() throws Throwable { |
| 506 |
int[] sum = new int[1]; |
| 507 |
for (int i = 0; i < iterations; i++) { |
| 508 |
sum[0] = 0; |
| 509 |
x.addAll(elements); |
| 510 |
for (Integer e; (e = x.pollLast()) != null; ) |
| 511 |
sum[0] += e; |
| 512 |
check.sum(sum[0]);}}}); |
| 513 |
} |
| 514 |
|
| 515 |
Stream<Job> blockingQueueJobs(BlockingQueue<Integer> x) { |
| 516 |
final String klazz = goodClassName(x); |
| 517 |
return Stream.of( |
| 518 |
new Job(klazz + " timed poll()") { |
| 519 |
public void work() throws Throwable { |
| 520 |
int[] sum = new int[1]; |
| 521 |
for (int i = 0; i < iterations; i++) { |
| 522 |
sum[0] = 0; |
| 523 |
x.addAll(elements); |
| 524 |
for (Integer e; (e = x.poll(0L, TimeUnit.DAYS)) != null; ) |
| 525 |
sum[0] += e; |
| 526 |
check.sum(sum[0]);}}}, |
| 527 |
new Job(klazz + " drainTo(sink)") { |
| 528 |
public void work() throws Throwable { |
| 529 |
ArrayList<Integer> sink = new ArrayList<>(); |
| 530 |
int[] sum = new int[1]; |
| 531 |
for (int i = 0; i < iterations; i++) { |
| 532 |
sum[0] = 0; |
| 533 |
sink.clear(); |
| 534 |
x.addAll(elements); |
| 535 |
x.drainTo(sink); |
| 536 |
sink.forEach(e -> sum[0] += e); |
| 537 |
check.sum(sum[0]);}}}, |
| 538 |
new Job(klazz + " drainTo(sink, n)") { |
| 539 |
public void work() throws Throwable { |
| 540 |
ArrayList<Integer> sink = new ArrayList<>(); |
| 541 |
int[] sum = new int[1]; |
| 542 |
for (int i = 0; i < iterations; i++) { |
| 543 |
sum[0] = 0; |
| 544 |
sink.clear(); |
| 545 |
x.addAll(elements); |
| 546 |
x.drainTo(sink, elements.size()); |
| 547 |
sink.forEach(e -> sum[0] += e); |
| 548 |
check.sum(sum[0]);}}}); |
| 549 |
} |
| 550 |
|
| 551 |
Stream<Job> blockingDequeJobs(BlockingDeque<Integer> x) { |
| 552 |
final String klazz = goodClassName(x); |
| 553 |
return Stream.of( |
| 554 |
new Job(klazz + " timed pollFirst()") { |
| 555 |
public void work() throws Throwable { |
| 556 |
int[] sum = new int[1]; |
| 557 |
for (int i = 0; i < iterations; i++) { |
| 558 |
sum[0] = 0; |
| 559 |
x.addAll(elements); |
| 560 |
for (Integer e; (e = x.pollFirst(0L, TimeUnit.DAYS)) != null; ) |
| 561 |
sum[0] += e; |
| 562 |
check.sum(sum[0]);}}}, |
| 563 |
new Job(klazz + " timed pollLast()") { |
| 564 |
public void work() throws Throwable { |
| 565 |
int[] sum = new int[1]; |
| 566 |
for (int i = 0; i < iterations; i++) { |
| 567 |
sum[0] = 0; |
| 568 |
x.addAll(elements); |
| 569 |
for (Integer e; (e = x.pollLast(0L, TimeUnit.DAYS)) != null; ) |
| 570 |
sum[0] += e; |
| 571 |
check.sum(sum[0]);}}}); |
| 572 |
} |
| 573 |
} |
