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TestAtomicPerformance.java
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TestAtomicPerformance.java
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/*
* Copyright 1999-2018 Alibaba Group Holding Ltd.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.alibaba.druid.benckmark.proxy;
import java.util.concurrent.atomic.AtomicInteger;
import junit.framework.TestCase;
public class TestAtomicPerformance extends TestCase {
public void test_0() throws Exception {
AtomicInteger count = new AtomicInteger();
for (int i = 0; i < 5; ++i) {
perf(count);
}
System.out.println();
for (int i = 0; i < 5; ++i) {
perf2(count);
}
}
private void perf(AtomicInteger count) {
long startMillis = System.currentTimeMillis();
count.set(0);
for (int i = 0; i < 1000 * 1000 * 100; ++i) {
int value = count.get();
count.compareAndSet(value, value + 1);
}
long millis = System.currentTimeMillis() - startMillis;
System.out.println("millis " + millis);
}
private void perf2(AtomicInteger count) {
long startMillis = System.currentTimeMillis();
count.set(0);
for (int i = 0; i < 1000 * 1000 * 100; ++i) {
int value = count.get();
count.weakCompareAndSet(value, value + 1);
}
long millis = System.currentTimeMillis() - startMillis;
System.out.println("weak millis " + millis);
}
}