137 lines
4.2 KiB
Java
137 lines
4.2 KiB
Java
/*
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* Copyright (c) 2018, 2019, 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.State;
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import java.util.concurrent.TimeUnit;
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/**
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* Trivial String concatenation benchmark.
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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 StringConcat {
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@Param("4711")
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public int intValue;
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public String stringValue = String.valueOf(intValue);
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public Object objectValue = Long.valueOf(intValue);
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public boolean boolValue = true;
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public byte byteValue = (byte)-128;
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public String emptyString = "";
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@Benchmark
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public String concatConstInt() {
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return "string" + intValue;
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}
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@Benchmark
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public String concatConstString() {
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return "string" + stringValue;
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}
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@Benchmark
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public String concatEmptyRight() {
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return stringValue + emptyString;
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}
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@Benchmark
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public String concatEmptyLeft() {
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return emptyString + stringValue;
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}
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@Benchmark
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public String concatMethodConstString() {
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return "string".concat(stringValue);
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}
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@Benchmark
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public String concatConstIntConstInt() {
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return "string" + intValue + "string" + intValue;
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}
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@Benchmark
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public String concatConstStringConstInt() {
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return "string" + stringValue + "string" + intValue;
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}
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@Benchmark
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public String concatMix4String() {
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// Investigate "profile pollution" between shared LFs that might eliminate some JIT optimizations
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String s1 = "string" + stringValue + stringValue + stringValue + stringValue;
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String s2 = "string" + stringValue + "string" + stringValue + stringValue + stringValue;
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String s3 = stringValue + stringValue + "string" + stringValue + "string" + stringValue + "string";
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String s4 = "string" + stringValue + "string" + stringValue + "string" + stringValue + "string" + stringValue + "string";
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return s1 + s2 + s3 + s4;
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}
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@Benchmark
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public String concatConst4String() {
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return "string" + stringValue + stringValue + stringValue + stringValue;
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}
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@Benchmark
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public String concat4String() {
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return stringValue + stringValue + stringValue + stringValue;
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}
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@Benchmark
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public String concatConst2String() {
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return "string" + stringValue + stringValue;
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}
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@Benchmark
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public String concatConstBoolByte() {
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return "string" + boolValue + byteValue;
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}
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@Benchmark
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public String concatConst6String() {
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return "string" + stringValue + stringValue + stringValue + stringValue + stringValue + stringValue;
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}
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@Benchmark
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public String concat6String() {
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return stringValue + stringValue + stringValue + stringValue + stringValue + stringValue;
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}
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@Benchmark
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public String concatConst6Object() {
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return "string" + objectValue + objectValue + objectValue + objectValue + objectValue + objectValue;
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}
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}
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