Linux-VServer virtualizes the Linux kernel so that multiple user-space environments, otherwise known as virtual Private Servers (VPS), run independently with no knowledge of one another.
Linux - VServer对Linux内核进行虚拟化，这样多个用户空间环境——又称为Virtual Private Server (VPS)——就可以单独运行，而不需要互相了解。
The rule of thumb is always set number of CPU VPs no more then two for per physical CPUs on the machine.
根据经验，为机器上的每个物理 CPU 设置的 CPU VP 数目应该总是不超过 2 个。
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