稳定的JVM，但系统内存增加 [英] Stable JVM but system memory increase

问题描述

我正在Ubuntu 16.04服务器上运行Java应用程序.经过广泛的研究，我发现JVM堆大小或多或少是恒定的.无论如何，不​​会增加内存.

I am running a java application on a Ubuntu 16.04 server. After extensive investigation I have discovered that the JVM heap size is more or less constant. At any rate there are no memory increase.

但是，当我使用htop查看服务器时，服务器的内存消耗却以惊人的速度增长.我不确定到底是什么原因造成的，但是它100％来自Java进程.

However, when I look at the server using htop the memory consumption of the server grows at an alarming rate. I am not sure what exactly is causing this but its 100% originating from java process.

我已经查看了hprof文件，但我无法真正告诉我我在寻找什么.

I have looked at the hprof files but I cant really tell what Im looking for.

我正在运行两个可能负责的库，但我并不十分熟悉它们.

I am running two libs that might be responsible but I am not intimately familiar with them;

• OrientDB(plocal)
• Hazelcast

• OrientDB (plocal)
• Hazelcast

我不确定这两者是否会导致JVM之外的内存增加.

Im not sure if either / both of these would cause a memory increase outside the JVM.

任何有关确定问题的最佳计划的建议都是很好的.

Any advice on the best plan to help identify the problem would be great.

推荐答案

感谢@ the8472，@ davmac @qwwdfsad和@ andrey-lomakin的评论.我很欣赏问题中提供的详细信息，但我想避免提供不相关的数据，而这些数据可能会破坏整个兔子.

我系统地测试了每个建议，结果发现问题出在 OrientDB .我不能说100％以下哪个解决了这个问题(可能两个都解决了).根据@ andrey-lomakin的建议，我从2.1.19升级到了2.2-rc1.为此，应用程序批处理插入开始引发异常，因此我将它们全部转换为单个线性查询.一旦竞争，内存泄漏就消失了.

I systematically tested each suggestion and it turns out that the problem was originating from OrientDB. I cant say 100% which of the following fixed the problem (possibly both). As per @andrey-lomakin suggestion I upgraded from 2.1.19 to 2.2-rc1. In doing this the applications batch inserts started throwing exceptions so I converted them all into single linear queries. Once compete the memory leak has gone.

作为旁注，以防在测试直接IO泄漏时影响其他任何人我确实惊奇地发现-Djdk.nio.maxCachedBufferSize=...与Java(TM) SE Runtime Environment (build 1.8.0_91-b14)兼容.

As a side note in case it affects anybody else while testing for direct IO leak I did discover to my suprise that -Djdk.nio.maxCachedBufferSize=... works withJava(TM) SE Runtime Environment (build 1.8.0_91-b14).

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