为什么docker容器内存使用量不会减少？

问题描述

我在这个容器中运行了一个带有的Java REST应用程序，但我注意到每个请求都是在请求完成后添加内存使用量而不是减少。我的第一个猜测是我忘记关闭一些流/缓冲区（这个应用程序处理了大量文件操作），但我查看了所有代码，看起来所有内容都已关闭。

I'm running a Java REST app with Apache JavaSpark in this container, but I noticed that each request is adding the memory usage and not decreasing after the request is done. My first guess was that I had forgotten to close some stream/buffer (this app deal with a lot of file manipulation), but I reviewed all the code and looks like everything is being closed.

这是我的Dockerfile：

Here is my Dockerfile:

FROM maven:3.5-jdk-8-alpine

WORKDIR /code

ADD pom.xml /code/pom.xml

RUN ["mvn", "dependency:resolve"]

ADD src /code/src

RUN ["mvn", "package"]

EXPOSE 1337

CMD exec java -jar "target/app.jar"

这是码头工具统计数据：

Here is the docker stats:

CONTAINER           CPU %               MEM USAGE / LIMIT       MEM %               NET I/O             BLOCK I/O           PIDS
2db8b2f5fd72        0.16%               66.36 MiB / 1.952 GiB   3.32%               12.9 kB / 106 kB    0 B / 0 B           23

推荐答案

Java通常会分配内存以前保留的，它只在重新启动进程时释放它。你可以看到这篇文章给出了完整的解释。

Java usually allocates memory that has previously reserved, it only frees it when you restart the process. You can see this post that gives the full explanation.

这篇关于为什么docker容器内存使用量不会减少？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！