virtual-machine - 虚拟机需要交换分区吗？

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我在我的物理机上运行 Ubuntu；和 VirtualBox 在上面运行各种虚拟的。

大多数时候，我在做“直接”安装；但今天我想变得“聪明”并检查了 Fedora 或 ubuntu 安装程序将在我的虚拟磁盘上创建的分区。

当然，在使用默认值时，我的虚拟磁盘的一些 GB 将用作“交换空间”。

现在我想知道:假设我有足够的物理内存(所以我可以为虚拟机分配 6 或 8 GB) - 虚拟机的专用交换空间是否有意义？

Answer 1

这是 answered at ServerFault :

TL;DR:使用交换:1. 避免内存不足错误，2. guest 操作系统更擅长内存管理

Ignoring the fact that people are dealing with OS specific reasons I have two reasons why it's a bad idea to not run with a swap partition/file.

1. If you have 1.5 GB of RAM allocated to a VM with no space file/partition and it wants to use 1.5 GB + 1 MB it will report an out of memory error. With the swap space it will be able to swap data out of active memory and onto the disk.

2. The guest OS does a much better job of memory management than the host. This is why technology like memory ballooning exists because the Host can make educated guesses on what memory isn't needed right now but the guest knows at a much more intelligent level (this keeps OS memory from being swapped out which could kill your performance).