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LANG-1110: Implement HashSetvBitSetTest using JMH
(side effect: closes #253, closes #191)
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pascalschumacher
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@ -46,6 +46,8 @@ The <action> type attribute can be add,update,fix,remove.
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<body>
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<release version="3.6" date="2017-MM-DD" description="TBD">
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<action issue="LANG-1110" type="update" dev="pschumacher" due-to="Bruno P. Kinoshita">Implement HashSetvBitSetTest using JMH</action>
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<action issue="LANG-1256" type="add" dev="pschumacher" due-to="C0rWin">Add JMH maven dependencies</action>
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<action issue="LANG-1167" type="add" dev="chtompki" due-to="Mark Dacek">Add null filter to ReflectionToStringBuilder</action>
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<action issue="LANG-1312" type="fix" dev="britter">LocaleUtils#toLocale does not support language followed by UN M.49 numeric-3 area code followed by variant</action>
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<action issue="LANG-1300" type="fix" dev="chtompki" due-to="Mark Dacek">Clarify or improve behaviour of int-based indexOf methods in StringUtils</action>
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@ -18,86 +18,63 @@
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import java.util.BitSet;
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import java.util.HashSet;
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import java.util.concurrent.TimeUnit;
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import org.junit.Assert;
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import org.junit.Test;
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import org.openjdk.jmh.annotations.Benchmark;
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import org.openjdk.jmh.annotations.BenchmarkMode;
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import org.openjdk.jmh.annotations.Mode;
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import org.openjdk.jmh.annotations.OutputTimeUnit;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.State;
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/**
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* Test to show whether using BitSet for removeAll() methods is faster than using HashSet.
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*/
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@State(Scope.Thread)
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public class HashSetvBitSetTest {
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private static final int LOOPS = 2000; // number of times to invoke methods
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private static final int LOOPS2 = 10000;
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private static final int numberOfElementsToCompute = 10;
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@Test
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public void testTimes() {
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timeHashSet(10); // warmup
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timeBitSet(10); // warmup
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long timeDiff = printTimes(0);
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timeDiff += printTimes(5);
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timeDiff += printTimes(10);
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timeDiff += printTimes(200);
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timeDiff += printTimes(50);
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timeDiff += printTimes(100);
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timeDiff += printTimes(1000);
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timeDiff += printTimes(2000);
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Assert.assertTrue(timeDiff <= 0);
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}
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/**
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* @return bitSet - HashSet
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*/
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private long printTimes(final int count) {
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final long hashSet = timeHashSet(count);
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final long bitSet = timeBitSet(count);
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// If percent is less than 100, then bitset is faster
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System.out.println("Ratio="+(bitSet*100/hashSet)+"% count="+count+" hash="+hashSet+" bits="+bitSet);
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return bitSet - hashSet;
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}
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private static long timeHashSet(final int count) {
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int [] result = new int[0];
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final long start = System.nanoTime();
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for (int i = 0; i < LOOPS; i++) {
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result = testHashSet(count);
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@Benchmark
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public int[] testHashSet() {
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final HashSet<Integer> toRemove = new HashSet<Integer>();
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int found = 0;
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for (int i = 0; i < numberOfElementsToCompute; i++) {
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toRemove.add(found++);
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}
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final long elapsed = System.nanoTime() - start;
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Assert.assertEquals(count, result.length);
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return elapsed;
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return extractIndices(toRemove);
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}
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private static long timeBitSet(final int count) {
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int [] result = new int[0];
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final long start = System.nanoTime();
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for (int i = 0; i < LOOPS; i++) {
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result = testBitSet(count);
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}
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final long elapsed = System.nanoTime() - start;
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Assert.assertEquals(count, result.length);
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return elapsed;
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}
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@SuppressWarnings("boxing")
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private static int[] testHashSet(final int count) {
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final HashSet<Integer> toRemove = new HashSet<>();
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int found = 0;
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for (int i = 0; i < count; i++) {
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toRemove.add(found++);
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}
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return extractIndices(toRemove);
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}
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private static int[] testBitSet(final int count) {
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@Benchmark
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public int[] testBitSet() {
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final BitSet toRemove = new BitSet();
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int found = 0;
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for (int i = 0; i < count; i++) {
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for (int i = 0; i < numberOfElementsToCompute; i++) {
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toRemove.set(found++);
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}
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return extractIndices(toRemove);
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}
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@Benchmark
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public int[] timeBitSetRemoveAll() {
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final BitSet toRemove = new BitSet();
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final int[] array = new int[100];
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toRemove.set(10, 20);
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return (int[]) ArrayUtils.removeAll(array, toRemove);
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}
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@Benchmark
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public int[] timeExtractRemoveAll() {
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final BitSet toRemove = new BitSet();
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final int[] array = new int[100];
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toRemove.set(10, 20);
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final int[] extractIndices = extractIndices(toRemove);
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return (int[]) ArrayUtils.removeAll((Object)array, extractIndices);
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}
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// --- utility methods
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private static int[] extractIndices(final HashSet<Integer> coll) {
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final int[] result = new int[coll.size()];
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int i = 0;
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@ -116,59 +93,4 @@ private static int[] extractIndices(final BitSet coll) {
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}
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return result;
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}
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@Test
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public void testTimesExtractOrBitset() {
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final BitSet toRemove = new BitSet();
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final int[] array = new int[100];
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toRemove.set(10, 20);
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timeBitSetRemoveAll(array, toRemove); // warmup
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timeExtractRemoveAll(array, toRemove); // warmup
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long timeDiff = printTimes(100,1);
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timeDiff += printTimes(100,10);
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timeDiff += printTimes(100,50);
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timeDiff += printTimes(100,100);
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timeDiff += printTimes(1000,10);
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timeDiff += printTimes(1000,100);
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timeDiff += printTimes(1000,500);
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timeDiff += printTimes(1000,1000);
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Assert.assertTrue(timeDiff <= 0);
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}
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private long printTimes(final int arraySize, final int bitSetSize) {
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final int[] array = new int[arraySize];
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final BitSet remove = new BitSet();
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for (int i = 0; i < bitSetSize; i++) {
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remove.set(i);
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}
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final long bitSet = timeBitSetRemoveAll(array, remove );
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final long extract = timeExtractRemoveAll(array, remove);
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// If percent is less than 100, then direct use of bitset is faster
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System.out.println("Ratio="+(bitSet*100/extract)+"% array="+array.length+" count="+remove.cardinality()+" extract="+extract+" bitset="+bitSet);
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return bitSet - extract;
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}
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private long timeBitSetRemoveAll(final int[] array, final BitSet toRemove) {
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int[] output = new int[0];
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final long start = System.nanoTime();
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for(int i = 0; i < LOOPS2; i++){
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output = (int[]) ArrayUtils.removeAll(array, toRemove);
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}
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final long end = System.nanoTime();
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Assert.assertEquals(array.length-toRemove.cardinality(), output.length);
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return end - start;
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}
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private long timeExtractRemoveAll(final int[] array, final BitSet toRemove) {
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int[] output = new int[0];
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final long start = System.nanoTime();
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for(int i = 0; i < LOOPS2; i++){
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final int[] extractIndices = extractIndices(toRemove);
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output = (int[]) ArrayUtils.removeAll((Object)array, extractIndices);
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}
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final long end = System.nanoTime();
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Assert.assertEquals(array.length-toRemove.cardinality(), output.length);
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return end - start;
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}
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}
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}
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