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8061281: Microbenchmark suite build support, directory layout and sample benchmarks

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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
This commit is contained in:
Claes Redestad 2018-11-16 23:39:51 +01:00
parent 14b7467279
commit 7a30c97753
247 changed files with 26097 additions and 13 deletions
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69
test/micro/org/openjdk/bench/java/lang/StringHashCode.java Normal file
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/*
* Copyright (c) 2014 Oracle and/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.Mode;
import org.openjdk.jmh.annotations.OutputTimeUnit;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import java.util.concurrent.TimeUnit;
/**
* Performance test of String.hashCode() function
*/
@BenchmarkMode(Mode.AverageTime)
@OutputTimeUnit(TimeUnit.NANOSECONDS)
@State(Scope.Thread)
public class StringHashCode {
private String hashcode;
private String hashcode0;
@Setup
public void setup() {
hashcode = "abcdefghijkl";
hashcode0 = new String(new char[]{72, 90, 100, 89, 105, 2, 72, 90, 100, 89, 105, 2});
}
/**
* Benchmark testing String.hashCode() with a regular 12 char string with
* the result possibly cached in String
*/
@Benchmark
public int cached() {
return hashcode.hashCode();
}
/**
* Benchmark testing String.hashCode() with a 12 char string with the
* hashcode = 0 forcing the value to always be recalculated.
*/
@Benchmark
public int notCached() {
return hashcode0.hashCode();
}
}