90 lines
3.1 KiB
Java
90 lines
3.1 KiB
Java
/*
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* Copyright (c) 2023, 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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package org.openjdk.bench.java.math;
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import java.math.BigInteger;
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import java.util.Arrays;
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import java.util.concurrent.TimeUnit;
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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.Fork;
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import org.openjdk.jmh.annotations.Measurement;
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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.Param;
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import org.openjdk.jmh.annotations.Scope;
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import org.openjdk.jmh.annotations.Setup;
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import org.openjdk.jmh.annotations.State;
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import org.openjdk.jmh.annotations.Warmup;
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import org.openjdk.jmh.infra.Blackhole;
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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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@Warmup(iterations = 3, time = 5)
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@Measurement(iterations = 3, time = 5)
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@Fork(value = 3)
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public class BigIntegerCompareTo {
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public enum Group {S, M, L}
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@Param({"S", "M", "L"})
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private Group group;
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private static final int MAX_LENGTH = Arrays.stream(Group.values())
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.mapToInt(p -> getNumbersOfBits(p).length)
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.max()
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.getAsInt();
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private BigInteger[] numbers;
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@Setup
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public void setup() {
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int[] nBits = getNumbersOfBits(group);
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numbers = new BigInteger[2 * MAX_LENGTH];
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for (int i = 0; i < MAX_LENGTH; i++) {
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var p = Shared.createPair(nBits[i % nBits.length]);
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numbers[2 * i] = p.x();
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numbers[2 * i + 1] = p.y();
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}
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}
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private static int[] getNumbersOfBits(Group p) {
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// the below arrays were derived from stats gathered from running tests in
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// the security area, which is the biggest client of BigInteger in JDK
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return switch (p) {
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case S -> new int[]{0, 1, 2, 11, 12, 13, 14, 15, 16, 17, 18, 19};
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case M -> new int[]{255, 256, 512};
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case L -> new int[]{1023, 1024, 1534, 1535, 1536};
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};
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}
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@Benchmark
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public void testCompareTo(Blackhole bh) {
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for (int i = 0; i < numbers.length; i += 2)
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bh.consume(numbers[i].compareTo(numbers[i + 1]));
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}
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}
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