# HG changeset patch # User shade # Date 1531482542 -7200 # Node ID 369cf7ad42af9ebd6d99742f94c3564c15376d1a # Parent 9e62f255b16cfd228efe84560e13fe2b404c834c CAS known nulls diff -r 9e62f255b16c -r 369cf7ad42af src/main/java/org/openjdk/gcbench/runtime/cmpxchg/CasBarriersKnownExpectNull.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/main/java/org/openjdk/gcbench/runtime/cmpxchg/CasBarriersKnownExpectNull.java Fri Jul 13 13:49:02 2018 +0200 @@ -0,0 +1,60 @@ +/* + * 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 CasBarriersKnownExpectNull { + + AtomicReference 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(null, t1); + ai.set(null); + } + + +} diff -r 9e62f255b16c -r 369cf7ad42af src/main/java/org/openjdk/gcbench/runtime/cmpxchg/CasBarriersKnownUpdateNull.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/src/main/java/org/openjdk/gcbench/runtime/cmpxchg/CasBarriersKnownUpdateNull.java Fri Jul 13 13:49:02 2018 +0200 @@ -0,0 +1,60 @@ +/* + * 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 CasBarriersKnownUpdateNull { + + AtomicReference 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, null); + ai.set(t1); + } + + +}