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Library providing immutable/persistent collection classes for
Java. While collections are immutable they provide methods for
adding and removing values by creating new modified copies of
themselves. Each copy shares almost all of its structure with
other copies to minimize memory consumption.
///###////////////////////////////////////////////////////////////////////////
//
// Burton Computer Corporation
// http://www.burton-computer.com
//
// Copyright (c) 2014, Burton Computer Corporation
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in
// the documentation and/or other materials provided with the
// distribution.
//
// Neither the name of the Burton Computer Corporation nor the names
// of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package org.javimmutable.collections.hash;
import org.javimmutable.collections.JImmutableArray;
import org.javimmutable.collections.JImmutableMap;
import org.javimmutable.collections.array.trie32.TrieArray;
import org.javimmutable.collections.common.MutableDelta;
import java.util.HashMap;
import java.util.Map;
import java.util.Random;
public class TimingComparison
{
public static void main(String[] argv)
throws Exception
{
if (argv.length != 2) {
System.err.println("usage: TimingComparison seed loops");
System.exit(1);
}
final int seed = Integer.valueOf(argv[0]);
final int loops = Integer.valueOf(argv[1]);
final int maxValue = 10 * loops;
final int maxKey = 100000000;
final int maxCommand = 10;
MutableDelta javaElapsed = new MutableDelta();
MutableDelta hashElapsed = new MutableDelta();
MutableDelta arrayElapsed = new MutableDelta();
System.out.println("warm up runs");
runLoop(seed, loops, maxValue, maxKey, maxCommand, new MutableDelta(), new MutableDelta(), new MutableDelta());
runLoop(seed, loops, maxValue, maxKey, maxCommand, new MutableDelta(), new MutableDelta(), new MutableDelta());
runLoop(seed, loops, maxValue, maxKey, maxCommand, new MutableDelta(), new MutableDelta(), new MutableDelta());
runLoop(seed, loops, maxValue, maxKey, maxCommand, new MutableDelta(), new MutableDelta(), new MutableDelta());
System.out.println();
System.out.println("real runs");
for (int i = 0; i < 25; ++i) {
runLoop(seed + i, loops, maxValue, maxKey, maxCommand, javaElapsed, hashElapsed, arrayElapsed);
System.out.println();
}
System.out.printf("java avg: %.1f hash avg: %.1f array avg: %.1f%n", javaElapsed.getValue() / 25.0, hashElapsed.getValue() / 25.0, arrayElapsed.getValue() / 25.0);
}
@SuppressWarnings("UnusedAssignment")
private static void runLoop(int seed,
int loops,
int maxValue,
int maxKey,
int maxCommand,
MutableDelta javaElapsed,
MutableDelta hashElapsed,
MutableDelta arrayElapsed)
{
Random random = new Random(seed);
int adds = 0;
int removes = 0;
int gets = 0;
long startMillis = System.currentTimeMillis();
Map expected = new HashMap();
for (int i = 1; i <= loops; ++i) {
int command = random.nextInt(maxCommand);
if (command <= 2) {
Integer key = random.nextInt(maxKey);
Integer value = random.nextInt(maxValue);
expected.put(key, value);
adds += 1;
} else if (command == 3) {
Integer key = random.nextInt(maxKey);
expected.remove(key);
removes += 1;
} else {
Integer key = random.nextInt(maxKey);
expected.get(key);
gets += 1;
}
}
long endMillis = System.currentTimeMillis();
javaElapsed.add((int)(endMillis - startMillis));
System.out.printf("java map adds %d removes %d gets %d size %d elapsed %d%n", adds, removes, gets, expected.size(), (endMillis - startMillis));
expected = null;
System.gc();
random = new Random(seed);
adds = 0;
removes = 0;
gets = 0;
startMillis = System.currentTimeMillis();
JImmutableMap map = JImmutableHashMap.of();
for (int i = 1; i <= loops; ++i) {
int command = random.nextInt(maxCommand);
if (command <= 2) {
Integer key = random.nextInt(maxKey);
Integer value = random.nextInt(maxValue);
map = map.assign(key, value);
adds += 1;
} else if (command == 3) {
Integer key = random.nextInt(maxKey);
map = map.delete(key);
removes += 1;
} else {
Integer key = random.nextInt(maxKey);
map.getValueOr(key, null);
gets += 1;
}
}
endMillis = System.currentTimeMillis();
hashElapsed.add((int)(endMillis - startMillis));
System.out.printf("jimm map adds %d removes %d gets %d size %d elapsed %d%n", adds, removes, gets, map.size(), (endMillis - startMillis));
map = null;
System.gc();
random = new Random(seed);
adds = 0;
removes = 0;
gets = 0;
startMillis = System.currentTimeMillis();
JImmutableArray array = TrieArray.of();
for (int i = 1; i <= loops; ++i) {
int command = random.nextInt(maxCommand);
if (command <= 2) {
Integer key = random.nextInt(maxKey);
Integer value = random.nextInt(maxValue);
array = array.assign(key, value);
adds += 1;
} else if (command == 3) {
Integer key = random.nextInt(maxKey);
array = array.delete(key);
removes += 1;
} else {
Integer key = random.nextInt(maxKey);
array.find(key);
gets += 1;
}
}
endMillis = System.currentTimeMillis();
arrayElapsed.add((int)(endMillis - startMillis));
System.out.printf("jimm ary adds %d removes %d gets %d size %d elapsed %d%n", adds, removes, gets, array.size(), (endMillis - startMillis));
array = null;
System.gc();
}
}