Java：非堆内存分析 [英] Java: non-heap-memory analyzes

问题描述

我们遇到的问题是我们的非堆内存一直在增长。所以我们必须每隔3天重启我们的jee（java8） - webapp（正如你在这里的截图中看到的那样：来自非堆内存和堆内存的屏幕截图）

we have the problem that our non-heap-memory is growing all the time. so we have to restart our jee (java8) - webapp every 3rd day (as you can see in the screenshot here: screenshot from non-heap- and heap-memory)

我已经尝试找出填满非堆的内容。但我找不到任何工具来创建非堆转储。您是否知道如何调查以了解哪些元素在不断增长？

I have already tried to find out what fills up that non-heap. But I couldn't find any tool to create a nonheap-dump. do you have any idea how i could investigate on that to find out what elements are increasingly growing?

java-version

java-version

java version "1.8.0_102"
Java(TM) SE Runtime Environment (build 1.8.0_102-b14)
Java HotSpot(TM) 64-Bit Server VM (build 25.102-b14, mixed mode)

tomcat-version

tomcat-version

Apache Tomcat Version 7.0.59

推荐答案

非堆内存使用情况，由 MemoryPoolMXBean 计算以下内存池：

Non-heap memory usage, as provided by MemoryPoolMXBean counts the following memory pools:

• Metaspace


• 压缩类空间


• 代码缓存

换句话说，标准非-heap memory statistics包括已编译方法和已加载类占用的空间。最有可能的是，增加的非堆内存使用量表明类加载器泄漏。

In other words, standard non-heap memory statistics includes spaces occupied by compiled methods and loaded classes. Most likely, the increasing non-heap memory usage indicates a class loader leak.

使用

• jmap -clstats PID 转储类加载器统计信息;


• jcmd PID GC.class_stats 打印有关每个已加载类的内存使用情况的详细信息。后者需要 -XX：+ UnlockDiagnosticVMOptions 。

• jmap -clstats PID to dump class loader statistics;
• jcmd PID GC.class_stats to print the detailed information about memory usage of each loaded class. The latter requires -XX:+UnlockDiagnosticVMOptions.

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