test/java/util/concurrent/ConcurrentHashMap/MapLoops.java - toolchain/jdk/jdk9_jdk - Git at Google

 /*
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
  * published by the Free Software Foundation.
  *
  * This code is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  * version 2 for more details (a copy is included in the LICENSE file that
  * accompanied this code).
  *
  * You should have received a copy of the GNU General Public License version
  * 2 along with this work; if not, write to the Free Software Foundation,
  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  *
  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  * or visit www.oracle.com if you need additional information or have any
  * questions.
  */

 /*
  * This file is available under and governed by the GNU General Public
  * License version 2 only, as published by the Free Software Foundation.
  * However, the following notice accompanied the original version of this
  * file:
  *
  * Written by Doug Lea with assistance from members of JCP JSR-166
  * Expert Group and released to the public domain, as explained at
  * http://creativecommons.org/licenses/publicdomain
  */

 /*
  * @test
  * @bug 4486658
  * @compile MapLoops.java
  * @run main/timeout=1600 MapLoops
  * @summary Exercise multithreaded maps, by default ConcurrentHashMap.
  * Multithreaded hash table test.  Each thread does a random walk
  * though elements of "key" array. On each iteration, it checks if
  * table includes key.  If absent, with probability pinsert it
  * inserts it, and if present, with probability premove it removes
  * it.  (pinsert and premove are expressed as percentages to simplify
  * parsing from command line.)
  */

 import java.util.*;
 import java.util.concurrent.*;

 public class MapLoops {
     static int nkeys       = 10000;
     static int pinsert     = 60;
     static int premove     = 2;
     static int maxThreads  = 100;
     static int nops        = 100000;
     static int removesPerMaxRandom;
     static int insertsPerMaxRandom;

     static final ExecutorService pool = Executors.newCachedThreadPool();

     static final List<Throwable> throwables
         = new CopyOnWriteArrayList<Throwable>();

     public static void main(String[] args) throws Exception {

         Class mapClass = null;
         if (args.length > 0) {
             try {
                 mapClass = Class.forName(args[0]);
             } catch (ClassNotFoundException e) {
                 throw new RuntimeException("Class " + args[0] + " not found.");
             }
         }
         else
             mapClass = java.util.concurrent.ConcurrentHashMap.class;

         if (args.length > 1)
             maxThreads = Integer.parseInt(args[1]);

         if (args.length > 2)
             nkeys = Integer.parseInt(args[2]);

         if (args.length > 3)
             pinsert = Integer.parseInt(args[3]);

         if (args.length > 4)
             premove = Integer.parseInt(args[4]);

         if (args.length > 5)
             nops = Integer.parseInt(args[5]);

         // normalize probabilities wrt random number generator
         removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
         insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));

         System.out.print("Class: " + mapClass.getName());
         System.out.print(" threads: " + maxThreads);
         System.out.print(" size: " + nkeys);
         System.out.print(" ins: " + pinsert);
         System.out.print(" rem: " + premove);
         System.out.print(" ops: " + nops);
         System.out.println();

         int k = 1;
         int warmups = 2;
         for (int i = 1; i <= maxThreads;) {
             Thread.sleep(100);
             test(i, nkeys, mapClass);
             if (warmups > 0)
                 --warmups;
             else if (i == k) {
                 k = i << 1;
                 i = i + (i >>> 1);
             }
             else if (i == 1 && k == 2) {
                 i = k;
                 warmups = 1;
             }
             else
                 i = k;
         }
         pool.shutdown();
         if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS))
             throw new Error();

         if (! throwables.isEmpty())
             throw new Error
                 (throwables.size() + " thread(s) terminated abruptly.");
     }

     static Integer[] makeKeys(int n) {
         LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
         Integer[] key = new Integer[n];
         for (int i = 0; i < key.length; ++i)
             key[i] = new Integer(rng.next());
         return key;
     }

     static void shuffleKeys(Integer[] key) {
         Random rng = new Random();
         for (int i = key.length; i > 1; --i) {
             int j = rng.nextInt(i);
             Integer tmp = key[j];
             key[j] = key[i-1];
             key[i-1] = tmp;
         }
     }

     static void test(int i, int nkeys, Class mapClass) throws Exception {
         System.out.print("Threads: " + i + "\t:");
         Map<Integer, Integer> map = (Map<Integer,Integer>)mapClass.newInstance();
         Integer[] key = makeKeys(nkeys);
         // Uncomment to start with a non-empty table
         //        for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
         //            map.put(key[j], key[j]);
         LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
         CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
         for (int t = 0; t < i; ++t)
             pool.execute(new Runner(map, key, barrier));
         barrier.await();
         barrier.await();
         long time = timer.getTime();
         long tpo = time / (i * (long)nops);
         System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
         double secs = (double)(time) / 1000000000.0;
         System.out.println("\t " + secs + "s run time");
         map.clear();
     }

     static class Runner implements Runnable {
         final Map<Integer,Integer> map;
         final Integer[] key;
         final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
         final CyclicBarrier barrier;
         int position;
         int total;

         Runner(Map<Integer,Integer> map, Integer[] key,  CyclicBarrier barrier) {
             this.map = map;
             this.key = key;
             this.barrier = barrier;
             position = key.length / 2;
         }

         int step() {
             // random-walk around key positions,  bunching accesses
             int r = rng.next();
             position += (r & 7) - 3;
             while (position >= key.length) position -= key.length;
             while (position < 0) position += key.length;

             Integer k = key[position];
             Integer x = map.get(k);

             if (x != null) {
                 if (x.intValue() != k.intValue())
                     throw new Error("bad mapping: " + x + " to " + k);

                 if (r < removesPerMaxRandom) {
                     if (map.remove(k) != null) {
                         position = total % key.length; // move from position
                         return 2;
                     }
                 }
             }
             else if (r < insertsPerMaxRandom) {
                 ++position;
                 map.put(k, k);
                 return 2;
             }

             // Uncomment to add a little computation between accesses
             //            total += LoopHelpers.compute1(k.intValue());
             total += r;
             return 1;
         }

         public void run() {
             try {
                 barrier.await();
                 int ops = nops;
                 while (ops > 0)
                     ops -= step();
                 barrier.await();
             }
             catch (Throwable throwable) {
                 synchronized(System.err) {
                     System.err.println("--------------------------------");
                     throwable.printStackTrace();
                 }
                 throwables.add(throwable);
             }
         }
     }
 }
	/*
	* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
	*
	* This code is free software; you can redistribute it and/or modify it
	* under the terms of the GNU General Public License version 2 only, as
	* published by the Free Software Foundation.
	*
	* This code is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
	* version 2 for more details (a copy is included in the LICENSE file that
	* accompanied this code).
	*
	* You should have received a copy of the GNU General Public License version
	* 2 along with this work; if not, write to the Free Software Foundation,
	* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
	*
	* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
	* or visit www.oracle.com if you need additional information or have any
	* questions.
	*/

	/*
	* This file is available under and governed by the GNU General Public
	* License version 2 only, as published by the Free Software Foundation.
	* However, the following notice accompanied the original version of this
	* file:
	*
	* Written by Doug Lea with assistance from members of JCP JSR-166
	* Expert Group and released to the public domain, as explained at
	* http://creativecommons.org/licenses/publicdomain
	*/

	/*
	* @test
	* @bug 4486658
	* @compile MapLoops.java
	* @run main/timeout=1600 MapLoops
	* @summary Exercise multithreaded maps, by default ConcurrentHashMap.
	* Multithreaded hash table test. Each thread does a random walk
	* though elements of "key" array. On each iteration, it checks if
	* table includes key. If absent, with probability pinsert it
	* inserts it, and if present, with probability premove it removes
	* it. (pinsert and premove are expressed as percentages to simplify
	* parsing from command line.)
	*/

	import java.util.*;
	import java.util.concurrent.*;

	public class MapLoops {
	static int nkeys = 10000;
	static int pinsert = 60;
	static int premove = 2;
	static int maxThreads = 100;
	static int nops = 100000;
	static int removesPerMaxRandom;
	static int insertsPerMaxRandom;

	static final ExecutorService pool = Executors.newCachedThreadPool();

	static final List<Throwable> throwables
	= new CopyOnWriteArrayList<Throwable>();

	public static void main(String[] args) throws Exception {

	Class mapClass = null;
	if (args.length > 0) {
	try {
	mapClass = Class.forName(args[0]);
	} catch (ClassNotFoundException e) {
	throw new RuntimeException("Class " + args[0] + " not found.");
	}
	}
	else
	mapClass = java.util.concurrent.ConcurrentHashMap.class;

	if (args.length > 1)
	maxThreads = Integer.parseInt(args[1]);

	if (args.length > 2)
	nkeys = Integer.parseInt(args[2]);

	if (args.length > 3)
	pinsert = Integer.parseInt(args[3]);

	if (args.length > 4)
	premove = Integer.parseInt(args[4]);

	if (args.length > 5)
	nops = Integer.parseInt(args[5]);

	// normalize probabilities wrt random number generator
	removesPerMaxRandom = (int)(((double)premove/100.0 * 0x7FFFFFFFL));
	insertsPerMaxRandom = (int)(((double)pinsert/100.0 * 0x7FFFFFFFL));

	System.out.print("Class: " + mapClass.getName());
	System.out.print(" threads: " + maxThreads);
	System.out.print(" size: " + nkeys);
	System.out.print(" ins: " + pinsert);
	System.out.print(" rem: " + premove);
	System.out.print(" ops: " + nops);
	System.out.println();

	int k = 1;
	int warmups = 2;
	for (int i = 1; i <= maxThreads;) {
	Thread.sleep(100);
	test(i, nkeys, mapClass);
	if (warmups > 0)
	--warmups;
	else if (i == k) {
	k = i << 1;
	i = i + (i >>> 1);
	}
	else if (i == 1 && k == 2) {
	i = k;
	warmups = 1;
	}
	else
	i = k;
	}
	pool.shutdown();
	if (! pool.awaitTermination(Long.MAX_VALUE, TimeUnit.NANOSECONDS))
	throw new Error();

	if (! throwables.isEmpty())
	throw new Error
	(throwables.size() + " thread(s) terminated abruptly.");
	}

	static Integer[] makeKeys(int n) {
	LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
	Integer[] key = new Integer[n];
	for (int i = 0; i < key.length; ++i)
	key[i] = new Integer(rng.next());
	return key;
	}

	static void shuffleKeys(Integer[] key) {
	Random rng = new Random();
	for (int i = key.length; i > 1; --i) {
	int j = rng.nextInt(i);
	Integer tmp = key[j];
	key[j] = key[i-1];
	key[i-1] = tmp;
	}
	}

	static void test(int i, int nkeys, Class mapClass) throws Exception {
	System.out.print("Threads: " + i + "\t:");
	Map<Integer, Integer> map = (Map<Integer,Integer>)mapClass.newInstance();
	Integer[] key = makeKeys(nkeys);
	// Uncomment to start with a non-empty table
	// for (int j = 0; j < nkeys; j += 4) // start 1/4 occupied
	// map.put(key[j], key[j]);
	LoopHelpers.BarrierTimer timer = new LoopHelpers.BarrierTimer();
	CyclicBarrier barrier = new CyclicBarrier(i+1, timer);
	for (int t = 0; t < i; ++t)
	pool.execute(new Runner(map, key, barrier));
	barrier.await();
	barrier.await();
	long time = timer.getTime();
	long tpo = time / (i * (long)nops);
	System.out.print(LoopHelpers.rightJustify(tpo) + " ns per op");
	double secs = (double)(time) / 1000000000.0;
	System.out.println("\t " + secs + "s run time");
	map.clear();
	}

	static class Runner implements Runnable {
	final Map<Integer,Integer> map;
	final Integer[] key;
	final LoopHelpers.SimpleRandom rng = new LoopHelpers.SimpleRandom();
	final CyclicBarrier barrier;
	int position;
	int total;

	Runner(Map<Integer,Integer> map, Integer[] key, CyclicBarrier barrier) {
	this.map = map;
	this.key = key;
	this.barrier = barrier;
	position = key.length / 2;
	}

	int step() {
	// random-walk around key positions, bunching accesses
	int r = rng.next();
	position += (r & 7) - 3;
	while (position >= key.length) position -= key.length;
	while (position < 0) position += key.length;

	Integer k = key[position];
	Integer x = map.get(k);

	if (x != null) {
	if (x.intValue() != k.intValue())
	throw new Error("bad mapping: " + x + " to " + k);

	if (r < removesPerMaxRandom) {
	if (map.remove(k) != null) {
	position = total % key.length; // move from position
	return 2;
	}
	}
	}
	else if (r < insertsPerMaxRandom) {
	++position;
	map.put(k, k);
	return 2;
	}

	// Uncomment to add a little computation between accesses
	// total += LoopHelpers.compute1(k.intValue());
	total += r;
	return 1;
	}

	public void run() {
	try {
	barrier.await();
	int ops = nops;
	while (ops > 0)
	ops -= step();
	barrier.await();
	}
	catch (Throwable throwable) {
	synchronized(System.err) {
	System.err.println("--------------------------------");
	throwable.printStackTrace();
	}
	throwables.add(throwable);
	}
	}
	}
	}