为嘛我看到 docker 比 virtualbox 还要吃内存呢? - V2EX
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coderabbit

为嘛我看到 docker 比 virtualbox 还要吃内存呢?

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  •   coderabbit Sep 5, 2018 5826 views
    This topic created in 2805 days ago, the information mentioned may be changed or developed.

    做 php 开发我一直跑的虚拟机,好嘛跟上时代潮流,我也折腾了个 docker 但在系统上看到 vbox cpu 占用 2%不到,内存吃了约 800M.docker cpu 占%3.内存吃了 1.5G 左右.虽然我是 32G 内存,我觉得也耐不住它这样操啊!装个虚拟机我是占了约 10 来个 G,docker 几个镜像加起来不到 400M,我承认这方面 docker 占优势.但硬盘这东西白菜价啊.更再呼的是内存和 cpu 你们怎么看呢!

    4 replies    2018-09-05 12:29:48 +08:00
    geektheripper
        1
    geektheripper  
       Sep 5, 2018   2
    没限制内存的情况下肯定无限吃内存啊。

    用 -m 参数限制容器的内存使用

    `docker run -m 800m --memory-swap=800m ...`

    https://docs.docker.com/config/containers/resource_constraints/
    PulpFunction
        2
    PulpFunction  
       Sep 5, 2018
    小鸡一共 1g 内存路过

    我占用高了就重启
    feverzsj
        3
    feverzsj  
       Sep 5, 2018
    你用的 php image 的 memory_limit 设置太高或者设置成了无限
    Reficul
        4
    Reficul  
       Sep 5, 2018 via Android   1
    Windows 和 mac 上 docker 默认就是虚拟机。就算 Linux 上面,容器里 /proc 里面内存信息也是宿主机一样的。有些程序例如 JVM 就会以为总量很大,在占用超过了一定百分比后再 gc。
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