7a30c97753
8061282: Migrate jmh-jdk-microbenchmarks into the JDK Co-authored-by: Magnus Ihse Bursie <magnus.ihse.bursie@oracle.com> Co-authored-by: Erik Joelsson <erik.joelsson@oracle.com> Co-authored-by: Staffan Friberg <sfriberg@kth.se> Reviewed-by: ecaspole, mchung, erikj, ihse
94 lines
3.0 KiB
Java
94 lines
3.0 KiB
Java
/*
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* Copyright (c) 2014 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.lang;
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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.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.Threads;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.concurrent.TimeUnit;
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.MICROSECONDS)
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@State(Scope.Thread)
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public class Longs {
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@Param("500")
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private int size;
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private long[] longArraySmall;
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private long[] longArrayBig;
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@Setup
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public void setup() {
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longArraySmall = new long[size];
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longArrayBig = new long[size];
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for (int i = 0; i < size; i++) {
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longArraySmall[i] = 100L * i + i + 103L;
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longArrayBig[i] = ((100L * i + i) << 32) + 4543 + i * 4;
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}
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}
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/** Performs toString on a bunch of java.lang.Long:s, all with small values, just a couple of digits. */
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@Benchmark
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@Threads(Threads.MAX)
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public void toStringSmall(Blackhole bh) {
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for (long value : longArraySmall) {
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bh.consume(Long.toString(value));
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}
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}
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/** Performs toString on a bunch of java.lang.Long:s, all with large values, around 10 digits. */
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@Benchmark
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@Threads(Threads.MAX)
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public void toStringBig(Blackhole bh) {
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for (long value : longArrayBig) {
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bh.consume(Long.toString(value));
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}
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}
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/*
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* Have them public to avoid total unrolling
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*/
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public int innerLoops = 1500;
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@Benchmark
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@Threads(Threads.MAX)
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public long repetitiveSubtraction() {
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long x = 127, dx = 0;
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for (int i = 0; i < innerLoops; i++) {
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x -= dx;
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dx = (dx - x);
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}
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return x;
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}
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}
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