计算单元测试运行期间发生的gc数量 [英] Count number of gc's that occur during a unit test run

问题描述

我目前正在编写单元测试以查看给定方法的性能影响。从实践中我们观察到，在执行给定方法的过程中，当前有很多gc正在发生。我想知道是否可以看到在从java运行方法期间发生了多少gcs。

可以使用 GarbageCollectorMXBean 来获取垃圾收集的数量。

您可以这样做：

 集合< GarbageCollectorMXBean> garbageCollectors = ManagementFactory.getGarbageCollectorMXBeans（）; （GarbageCollectorMXBean garbageCollectorMBean：garbageCollectors）
 {
 String gcName = garbageCollectorMBean.getName（）; 
 long gcCount = garbageCollectorMBean.getCollectionCount（）; 
} 
  

I am currently writing a unit test to see the performance impact of a given method. From practice we observed that currently lots of gc's are occurring during the execution of the given method. I was wondering whether it is possible to see how many gcs occurred during the method run from java.

解决方案

You can use GarbageCollectorMXBean to get the count of garbage collections.

You can do something like this:

Collection<GarbageCollectorMXBean> garbageCollectors = ManagementFactory.getGarbageCollectorMXBeans();
for (GarbageCollectorMXBean garbageCollectorMBean : garbageCollectors) {
    String gcName = garbageCollectorMBean.getName();
    long gcCount = garbageCollectorMBean.getCollectionCount();
}

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