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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
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*
* 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).
*
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* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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package org.openjdk.bench.java.math;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OperationsPerInvocation;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Warmup;
import org.openjdk.jmh.infra.Blackhole;
import java.math.BigInteger;
import java.util.Random;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(value = 3)
public class BigIntegers {
private BigInteger[] hugeArray, largeArray, smallArray, shiftArray;
public String[] dummyStringArray;
public Object[] dummyArr;
private static final int TESTSIZE = 1000;
@Setup
public void setup() {
Random r = new Random(1123);
int numbits = r.nextInt(16384);
hugeArray = new BigInteger[TESTSIZE]; /*
* Huge numbers larger than
* MAX_LONG
*/
largeArray = new BigInteger[TESTSIZE]; /*
* Large numbers less than
* MAX_LONG but larger than
* MAX_INT
*/
smallArray = new BigInteger[TESTSIZE]; /*
* Small number less than
* MAX_INT
*/
shiftArray = new BigInteger[TESTSIZE]; /*
* Each array entry is atmost 16k bits
* in size
*/
dummyStringArray = new String[TESTSIZE];
dummyArr = new Object[TESTSIZE];
for (int i = 0; i < TESTSIZE; i++) {
int value = Math.abs(r.nextInt());
hugeArray[i] = new BigInteger("" + ((long) value + (long) Integer.MAX_VALUE)
+ ((long) value + (long) Integer.MAX_VALUE));
largeArray[i] = new BigInteger("" + ((long) value + (long) Integer.MAX_VALUE));
smallArray[i] = new BigInteger("" + ((long) value / 1000));
shiftArray[i] = new BigInteger(numbits, r);
}
}
/** Test BigInteger.toString() with huge numbers larger than MAX_LONG */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testHugeToString(Blackhole bh) {
for (BigInteger s : hugeArray) {
bh.consume(s.toString());
}
}
/** Test BigInteger.toString() with large numbers less than MAX_LONG but larger than MAX_INT */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testLargeToString(Blackhole bh) {
for (BigInteger s : largeArray) {
bh.consume(s.toString());
}
}
/** Test BigInteger.toString() with small numbers less than MAX_INT */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testSmallToString(Blackhole bh) {
for (BigInteger s : smallArray) {
bh.consume(s.toString());
}
}
/** Invokes the multiply method of BigInteger with various different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testMultiply(Blackhole bh) {
BigInteger tmp = null;
for (BigInteger s : hugeArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.multiply(s);
}
bh.consume(tmp);
}
/** Invokes the multiply method of BigInteger with various different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testAdd(Blackhole bh) {
BigInteger tmp = null;
for (BigInteger s : hugeArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.add(s);
}
bh.consume(tmp);
}
/** Invokes the shiftLeft method of BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testLeftShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
BigInteger tmp = null;
for (BigInteger s : shiftArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.shiftLeft(shift);
}
bh.consume(tmp);
}
/** Invokes the shiftRight method of BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testRightShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
BigInteger tmp = null;
for (BigInteger s : shiftArray) {
if (tmp == null) {
tmp = s;
continue;
}
tmp = tmp.shiftRight(shift);
}
bh.consume(tmp);
}
/** Invokes the gcd method of BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testGcd(Blackhole bh) {
for (int i = 0; i < TESTSIZE; i++) {
BigInteger i1 = shiftArray[TESTSIZE - i - 1];
BigInteger i2 = shiftArray[i];
bh.consume(i2.gcd(i1));
}
}
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 5, time = 1)
@Measurement(iterations = 5, time = 1)
@Fork(value = 3)
public static class SmallShifts {
@Param({"32", "128", "256"})
private int maxNumbits;
/*
* Small numbers, bits count in range [maxNumbits - 31, maxNumbits]
*/
BigInteger[] smallShiftArray = new BigInteger[TESTSIZE];
@Setup
public void setup() {
Random r = new Random(1123);
for (int i = 0; i < TESTSIZE; i++) {
int value = Math.abs(r.nextInt());
smallShiftArray[i] = new BigInteger(Math.max(maxNumbits - value % 32, 0), r);
}
}
/** Invokes the shiftLeft method of small BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testLeftShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
for (BigInteger s : smallShiftArray) {
bh.consume(s.shiftLeft(shift));
}
}
/** Invokes the shiftRight method of small BigInteger with different values. */
@Benchmark
@OperationsPerInvocation(TESTSIZE)
public void testRightShift(Blackhole bh) {
Random rand = new Random();
int shift = rand.nextInt(30) + 1;
for (BigInteger s : smallShiftArray) {
bh.consume(s.shiftRight(shift));
}
}
}
}