On a low-memory (<512MB RAM) system, too many simultaneous compilations can slow the system due to paging.

在低内存（<512MB RAM）系统上，同时编译的数量太多会因为分页而使系统变慢。

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If no argument is provided to -j, then all source files are queued up in the system for simultaneous compilation.

如果没有给- j提供任何参数，则所有源文件都会在系统中排队，等待同时编译。

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A Blade PC can also run a single Linux operating system that is available for simultaneous use by multiple users.

Blade PC还可以运行供多个用户同时使用的Linux操作系统。

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