java代码中获取full gc、young gc情况
程序员文章站
2022-05-06 21:21:13
...
对于大型的高并发服务,我们可能需要定时或实时获取进程的gc情况,很荣幸,java给我们提供了现成的方法。
private static void reportGC(ReportAPI reporter) {
long fullCount = 0, fullTime = 0, youngCount = 0, youngTime = 0;
List<GarbageCollectorMXBean> gcs = ManagementFactory.getGarbageCollectorMXBeans();
for (GarbageCollectorMXBean gc : gcs) {
switch (GarbageCollectorName.of(gc.getName())) {
case MarkSweepCompact:
case PSMarkSweep:
case ConcurrentMarkSweep:
fullCount += gc.getCollectionCount();
fullTime += gc.getCollectionTime();
break;
case Copy:
case ParNew:
case PSScavenge:
youngCount += gc.getCollectionCount();
youngTime += gc.getCollectionTime();
break;
}
//todo your deal code, perfcounter report or write log here
}
getGarbageCollectorMXBeans可以获取JVM中不同的对象列表,从中找出我们的jvm.properties中配置使用的gc方法,分别进行统计次数及时间即可。
/**
* Returns a list of {@link GarbageCollectorMXBean} objects
* in the Java virtual machine.
* The Java virtual machine may have one or more
* <tt>GarbageCollectorMXBean</tt> objects.
* It may add or remove <tt>GarbageCollectorMXBean</tt>
* during execution.
*
* @return a list of <tt>GarbageCollectorMXBean</tt> objects.
*
*/
public static List<GarbageCollectorMXBean> getGarbageCollectorMXBeans() {
return ManagementFactoryHelper.getGarbageCollectorMXBeans();
}
拿到full gc时间、次数及young gc时间及次数,进行后续的具体分析就可以了。