为什么32位操作系统支持4 GB的RAM? [英] Why does a 32-bit OS support 4 GB of RAM?

问题描述

只需阅读关于OS的纯正课程中的一些笔记

Just reading some notes in a purdue lecture about OSs, and it says:

程序将内存视为数组 从地址0到2 ^ 32-1(0到 4GB-1)

A program sees memory as an array of bytes that goes from address 0 to 2^32-1 (0 to 4GB-1)

为什么要使用4 GB?

Why 4 GB?

推荐答案

因为32位能够表示最多2 ³² 的数字-1 = 4294967295 = 4 GiB-1并因此寻址到2 ³² 个单独的字节，则为4 GiB.

Because 32 bits are able to represent numbers up to 2³² − 1 = 4294967295 = 4 GiB − 1 and therefore address up to 2³² individual bytes which would be 4 GiB then.

不过，有一些方法可以避免这种情况.例如，即使使用32位操作系统，也可以使用 PAE .但是，从历史上看，它最常在服务器上使用.另外，非服务器Windows SKU不支持它.不过，考虑到64位CPU，操作系统和驱动程序的支持已司空见惯，到目前为止，所有这些都无济于事.

There are ways to circumvent that, though. For example using PAE even a 32-bit operating system can support more memory. Historically this has most commonly been used on servers, though. Also, the non-server Windows SKUs don't support it. By now all that is moot, though, given that 64-bit CPUs, OSes and driver support are commonplace.

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