73 lines
2.6 KiB
Java
73 lines
2.6 KiB
Java
/*
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* Copyright Amazon.com Inc. 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.vm.compiler;
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import org.openjdk.jmh.annotations.*;
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import org.openjdk.jmh.infra.Blackhole;
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import java.util.concurrent.TimeUnit;
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@Warmup(iterations = 5, time = 300, timeUnit = TimeUnit.MILLISECONDS)
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@Measurement(iterations = 5, time = 300, timeUnit = TimeUnit.MILLISECONDS)
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@Fork(value = 3, jvmArgs = {"-XX:+TieredCompilation", "-XX:TieredStopAtLevel=1"})
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@BenchmarkMode(Mode.AverageTime)
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@OutputTimeUnit(TimeUnit.NANOSECONDS)
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@Threads(Threads.MAX)
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@State(Scope.Benchmark)
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public class SecondarySuperCacheIntraContention {
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// This test targets C1 specifically, to enter the interesting code path
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// without heavily optimizing compiler like C2 optimizing based on profiles,
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// or folding the instanceof checks.
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// The test verifies what happens on unhappy path, when we contend a lot over
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// the secondary super cache, where different threads want to update the cache
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// with different value. In this test, every thread comes with its own contending
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// value. Meaning, this tests the INTRA-thread contention.
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interface IA {}
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interface IB {}
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class B {}
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class C1 extends B implements IA, IB {}
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class C2 extends B implements IA, IB {}
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volatile B o1, o2;
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@Setup
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public void setup() {
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o1 = new C1();
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o2 = new C2();
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}
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@Benchmark
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@OperationsPerInvocation(4)
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public void test(Blackhole bh) {
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bh.consume(o1 instanceof IA);
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bh.consume(o2 instanceof IA);
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bh.consume(o1 instanceof IB);
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bh.consume(o2 instanceof IB);
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}
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}
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