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8282429: StringBuilder/StringBuffer.toString() skip compressing for UTF16 strings

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Reviewed-by: djelinski, redestad
This commit is contained in:
Xin Liu 2022-04-01 04:42:03 +00:00
parent 8eff80682a
commit bab431cc12
6 changed files with 122 additions and 11 deletions
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60
test/micro/org/openjdk/bench/java/lang/StringBuilderToString.java Normal file
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/*
* Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package org.openjdk.bench.java.lang;
import org.openjdk.jmh.annotations.Benchmark;
import org.openjdk.jmh.annotations.BenchmarkMode;
import org.openjdk.jmh.annotations.Fork;
import org.openjdk.jmh.annotations.Measurement;
import org.openjdk.jmh.annotations.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Warmup;
import java.util.concurrent.TimeUnit;
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
@Warmup(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
@Measurement(iterations = 5, time = 1000, timeUnit = TimeUnit.MILLISECONDS)
@Fork(3)
public class StringBuilderToString {
@Param({"128", "256", "1024"})
public int MIXED_SIZE;
/**
* This microbench simulates how java.io.BufferedReader uses StringBuilder.
*/
@Benchmark
public String toStringWithMixedChars() {
StringBuilder sb = new StringBuilder(MIXED_SIZE);
for (int i = 0; i < MIXED_SIZE - 4; ++i) {
sb.append('a');
}
sb.append('\u3042'); // can't be encoded in latin-1,
return sb.toString();
}
}