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8245043: Simplified contention benchmark
Reviewed-by: shade, skuksenko
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Eric Caspole committed Jun 4, 2020
1 parent e1b8e91 commit a351ebd40b65281ce769b7a4a620e6856d9120be
Showing with 104 additions and 0 deletions.
  1. +104 −0 test/micro/org/openjdk/bench/vm/lang/MonitorBench.java
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/*
* Copyright (c) 2020, 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.
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package org.openjdk.bench.vm.lang;

import java.util.concurrent.ThreadLocalRandom;
import java.util.concurrent.TimeUnit;

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.Param;
import org.openjdk.jmh.annotations.Scope;
import org.openjdk.jmh.annotations.Setup;
import org.openjdk.jmh.annotations.State;
import org.openjdk.jmh.annotations.Threads;
import org.openjdk.jmh.infra.Blackhole;

@State(Scope.Benchmark)
@Threads(Threads.MAX)
public class MonitorBench {

@Param({"100", "250"})
int consumeUnlocked;

@Param({"100", "250"})
int consumeLocked;

@Param({"0", "1"})
int throwThreshold;

@Param({"10000"})
int range;

@Param({"1"})
static int locksSize;

Object[] sharedLocks;

@Setup
public void setup() {
sharedLocks = new Object[locksSize];
for (int i = 0; i < locksSize; i++) {
sharedLocks[i] = new Object();
}
}

int update2(int sharedIndex) throws Exception {
synchronized (sharedLocks[sharedIndex]) {
Blackhole.consumeCPU(consumeLocked);
if (ThreadLocalRandom.current().nextInt(range) < throwThreshold) {
throw new Exception("Update failed");
} else {
Blackhole.consumeCPU(consumeLocked);
return 0;
}
}
}

int update1(int sharedIndex) throws Exception {
synchronized (sharedLocks[sharedIndex]) {
Blackhole.consumeCPU(consumeLocked);
return update2(sharedIndex);
}
}

@Benchmark
@BenchmarkMode(Mode.Throughput)
@OutputTimeUnit(TimeUnit.MILLISECONDS)
public int action() throws InterruptedException {
Blackhole.consumeCPU(consumeUnlocked);
int sharedLockIndex = ThreadLocalRandom.current().nextInt(locksSize);
Object sharedLock = sharedLocks[sharedLockIndex];
synchronized (sharedLock) {
while (true) {
try {
return update1(sharedLockIndex);
} catch (Exception e) {
sharedLock.wait(100);
}
}
}
}
}

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