b438cffdb9
Co-authored-by: Vladimir Ivanov <vaivanov@openjdk.org> Reviewed-by: sviswanathan, ecaspole
88 lines
2.6 KiB
Java
88 lines
2.6 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.lang;
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import org.openjdk.jmh.annotations.*;
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import java.util.concurrent.TimeUnit;
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/*
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* This benchmark naively explores String::startsWith and other String
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* comparison methods
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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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@Warmup(iterations = 5, time = 1)
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@Measurement(iterations = 5, time = 1)
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@Fork(value = 3)
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public class StringComparisons {
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@Param({"6", "15", "1024"})
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public int size;
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@Param({"true", "false"})
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public boolean utf16;
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public String string;
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public String equalString;
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public String endsWithA;
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public String endsWithB;
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public String startsWithA;
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@Setup
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public void setup() {
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String c = utf16 ? "\uff11" : "c";
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string = c.repeat(size);
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equalString = c.repeat(size);
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endsWithA = c.repeat(size).concat("A");
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endsWithB = c.repeat(size).concat("B");
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startsWithA = "A" + (c.repeat(size));
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}
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@Benchmark
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public boolean startsWith() {
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return endsWithA.startsWith(string);
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}
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@Benchmark
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public boolean endsWith() {
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return startsWithA.endsWith(string);
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}
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@Benchmark
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public boolean regionMatches() {
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return endsWithA.regionMatches(0, endsWithB, 0, endsWithB.length());
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}
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@Benchmark
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public boolean regionMatchesRange() {
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return startsWithA.regionMatches(1, endsWithB, 0, endsWithB.length() - 1);
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}
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@Benchmark
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public boolean regionMatchesCI() {
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return endsWithA.regionMatches(true, 0, endsWithB, 0, endsWithB.length());
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}
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}
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