虚拟机可以使用多少内存 [英] How much memory could vm use

问题描述

我阅读了文档 了解虚拟内存 并说在Linux VM中更改可调参数的一种方法是命令:

I read the document Understanding Virtual Memory and it said one method for changing tunable parameters in the Linux VM was the command:

sysctl -w vm.max_map_count=65535

我想知道65535是什么意思，并且该设置可以使vm使用多少内存.

I want to know what the number 65535 means and how much memory could vm use by the setting.

推荐答案

来自 Linux内核文档 :

max_map_count:

max_map_count:

此文件包含一个进程的最大内存映射区域数 可能有.内存映射区域用作调用的副作用 malloc，直接由mmap和mprotect以及在加载共享时 库.

This file contains the maximum number of memory map areas a process may have. Memory map areas are used as a side-effect of calling malloc, directly by mmap and mprotect, and also when loading shared libraries.

虽然大多数应用程序需要少于一千张地图，但某些情况下 程序，尤其是malloc调试器，可能会消耗很多程序， 例如，每次分配最多一到两张地图.

While most applications need less than a thousand maps, certain programs, particularly malloc debuggers, may consume lots of them, e.g., up to one or two maps per allocation.

默认值为65536.

最底线:此设置限制了离散映射内存 areas 的 number -就其本身而言，它不限制那些 size 的大小进程可以使用的区域或内存.

Bottom line: this setting limits the number of discrete mapped memory areas - on its own it imposes no limit on the size of those areas or on the memory that is usable by a process.

是的，这是

sysctl -w vm.max_map_count=65535

只是一种更好的编写方式:

is just a nicer way of writing this:

echo 65535 > /proc/sys/vm/max_map_count

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