mirror of
https://github.com/openjdk/jdk.git
synced 2026-01-28 12:09:14 +00:00
108 lines
3.2 KiB
Java
108 lines
3.2 KiB
Java
/*
|
|
* Copyright (c) 2025, 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.vm.compiler;
|
|
|
|
import java.util.concurrent.TimeUnit;
|
|
import org.openjdk.jmh.annotations.Benchmark;
|
|
import org.openjdk.jmh.annotations.BenchmarkMode;
|
|
import org.openjdk.jmh.annotations.CompilerControl;
|
|
import org.openjdk.jmh.annotations.Fork;
|
|
import org.openjdk.jmh.annotations.Group;
|
|
import org.openjdk.jmh.annotations.GroupThreads;
|
|
import org.openjdk.jmh.annotations.Measurement;
|
|
import org.openjdk.jmh.annotations.Mode;
|
|
import org.openjdk.jmh.annotations.OperationsPerInvocation;
|
|
import org.openjdk.jmh.annotations.OutputTimeUnit;
|
|
import org.openjdk.jmh.annotations.Param;
|
|
import org.openjdk.jmh.annotations.Scope;
|
|
import org.openjdk.jmh.annotations.Setup;
|
|
import org.openjdk.jmh.annotations.State;
|
|
import org.openjdk.jmh.annotations.Warmup;
|
|
import org.openjdk.jmh.infra.Blackhole;
|
|
|
|
@BenchmarkMode(Mode.Throughput)
|
|
@State(Scope.Benchmark)
|
|
@OutputTimeUnit(TimeUnit.MICROSECONDS)
|
|
@Warmup(iterations = 8, time = 4)
|
|
@Measurement(iterations = 6, time = 3)
|
|
public class DMBCheck {
|
|
|
|
// The allocations of DoubleDMB$A and DoubleDMB$C
|
|
// will cause aarch64 dmb barrier instructions.
|
|
// The different latency of the dmb ish/ishst/ishld modes
|
|
// may make a noticeable difference in the benchmark results.
|
|
// These modes may be set by cpu defaults or XX options.
|
|
|
|
class A {
|
|
|
|
final String b = new String("Hi there");
|
|
}
|
|
|
|
class C {
|
|
|
|
private A a;
|
|
|
|
public A getA() {
|
|
if (a == null) {
|
|
a = new A();
|
|
}
|
|
return a;
|
|
}
|
|
}
|
|
|
|
static C c = null;
|
|
|
|
@Setup
|
|
public void setup() {
|
|
c = new C();
|
|
}
|
|
|
|
@CompilerControl(CompilerControl.Mode.DONT_INLINE)
|
|
void action(Blackhole b) throws Exception {
|
|
c = new C();
|
|
|
|
if (c.getA().b == null) {
|
|
throw new Exception("a should not be null");
|
|
}
|
|
b.consume(c);
|
|
}
|
|
|
|
@Benchmark
|
|
@Fork(value = 1, jvmArgs = {
|
|
"-XX:+UnlockDiagnosticVMOptions", "-XX:+AlwaysMergeDMB", "-XX:+IgnoreUnrecognizedVMOptions"})
|
|
public void plusAlwaysMergeDMB(Blackhole b) throws Exception {
|
|
|
|
action(b);
|
|
}
|
|
|
|
@Benchmark
|
|
@Fork(value = 1, jvmArgs = {
|
|
"-XX:+UnlockDiagnosticVMOptions", "-XX:-AlwaysMergeDMB", "-XX:+IgnoreUnrecognizedVMOptions"})
|
|
public void minusAlwaysMergeDMB(Blackhole b) throws Exception {
|
|
|
|
action(b);
|
|
}
|
|
|
|
}
|