vm 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 它说在 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

我想知道数字 65535 是什么意思，以及设置中 vm 可以使用多少内存.

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:

这个文件包含一个进程的最大内存映射区数可能有.内存映射区域用作调用的副作用malloc，直接通过mmap和mprotect，加载shared时也是图书馆.

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不到一千张地图，但某些程序，尤其是 malloc 调试器，可能会消耗很多，例如，每个分配最多一或两个映射.

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.

The default value is 65536.

底线:此设置限制了离散映射内存区域的数量 - 就其本身而言，它对那些大小没有限制区域或进程可用的内存上.

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，这个:

sysctl -w vm.max_map_count=65535

只是一种更好的写法:

echo 65535 > /proc/sys/vm/max_map_count

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