Mercurial > hg > gc-bench
view src/main/java/org/openjdk/gcbench/runtime/cmpxchg/CasBarriersRefSuccess.java @ 90:14c1bb4faa6e
Optimize imports
author | shade |
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date | Thu, 23 Nov 2017 15:12:49 +0100 |
parents | 583fef4276f5 |
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/* * Copyright (c) 2017, Red Hat Inc. 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. Oracle designates this * particular file as subject to the "Classpath" exception as provided * by Oracle in the LICENSE file that accompanied this code. * * 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.gcbench.runtime.cmpxchg; import org.openjdk.jmh.annotations.*; import java.util.concurrent.TimeUnit; import java.util.concurrent.atomic.AtomicReference; @Warmup(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) @Measurement(iterations = 5, time = 1, timeUnit = TimeUnit.SECONDS) @Fork(1) @BenchmarkMode(Mode.AverageTime) @OutputTimeUnit(TimeUnit.NANOSECONDS) @Threads(1) @State(Scope.Benchmark) public class CasBarriersRefSuccess { AtomicReference<Object> ai; Object t1 = new Object(); Object t2 = t1; @Setup public void setup() { ai = new AtomicReference<>(); ai.set(t1); } @Benchmark @CompilerControl(CompilerControl.Mode.DONT_INLINE) public void test() { ai.compareAndSet(t1, t2); } /* i7 4790K, 4.0 Ghz, Linux x86_64, JDK 9 (Shenandoah, 2016-09-05) Benchmark Mode Cnt Score Error Units # Shenandoah CasBarriers.test avgt 25 16.418 ± 0.029 ns/op # G1 CasBarriers.test avgt 25 12.545 ± 0.041 ns/op # Parallel CasBarriers.test avgt 25 12.526 ± 0.030 ns/op Analysis pending. */ }