81 lines
3.0 KiB
Java
81 lines
3.0 KiB
Java
/*
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* Copyright (c) 2014, 2022, 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.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.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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import java.util.Locale;
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import java.util.Random;
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import java.util.concurrent.TimeUnit;
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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 = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
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@Fork(3)
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public class StringOther {
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private String testString;
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private Random rnd;
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@Setup
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public void setup() {
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testString = "Idealism is what precedes experience; cynicism is what follows.";
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rnd = new Random();
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}
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@Benchmark
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public void charAt(Blackhole bh) {
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for (int i = 0; i < testString.length(); i++) {
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bh.consume(testString.charAt(i));
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}
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}
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/**
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* Creates (hopefully) unique Strings and internizes them, creating a zillion forgettable strings in the JVMs string
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* pool.
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* <p/>
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* This will test 1.) The data structure/whatever for getting and adding Strings to intern table. 2.) The
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* intern-caches (java) behaviour on negative lookup (the string is new) 3.) GC's handling of weak handles. Since
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* every gc we must process and pretty much kill a zillion interned strings that are now not referenced anymore, the
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* majority of GC time will be spent in handle processing. So we get a picture of how well the pathological case of
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* this goes.
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*/
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@Benchmark
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public String internUnique() {
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return String.valueOf(rnd.nextInt()).intern();
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}
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}
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