如何打印出Java jvm内存用于调试目的？ [英] How to print out Java jvm memory use for debugging purposes?

问题描述

我有一个大型Java应用程序，有时会使用大量内存，我希望每隔一段时间监视一次，以查看是否已达到堆或permgen限制或已接近它们。

I have a large Java app that uses massive amounts of memory at times and I would like to monitor this at intervals to see if heap or permgen limits are reached or have gotten near to them.

如何使用java打印出最相关的mem使用信息？

How can I print out the most relevant pieces of mem usage information using java?

推荐答案

这是一个我们所拥有的一段代码片段定期记录我们应用的内存使用情况：

Here's a snippet from a piece of code we have that periodically logs the memory usage of our app:

import java.lang.management.GarbageCollectorMXBean
import java.lang.management.ManagementFactory
import java.lang.management.MemoryPoolMXBean
import java.lang.management.MemoryUsage

log("Heap", ManagementFactory.getMemoryMXBean().getHeapMemoryUsage());
log("NonHeap", ManagementFactory.getMemoryMXBean().getNonHeapMemoryUsage());
List<MemoryPoolMXBean> beans = ManagementFactory.getMemoryPoolMXBeans();
for (MemoryPoolMXBean bean: beans) {
    log(bean.getName(), bean.getUsage());
}

for (GarbageCollectorMXBean bean: ManagementFactory.getGarbageCollectorMXBeans()) {
    log(bean.getName(), bean.getCollectionCount(), bean.getCollectionTime());
}

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