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As said above, man make is pretty explicit, if you know what load-average means, which is for instance summarized in this superuser question. To paraphrase the documentation,

如上所述，man make是非常明确的，如果你知道load-average是什么意思，例如在这个超级用户问题中总结出来的。套用的文档,

• -j N will let make attempt to launch up to N commands in parallel, regardless of what else might be running on the system.
• - jn将尝试并行启动N个命令，而不管系统上还运行着什么。
• -l N will let make attempt to launch new commands only if the load-average, i.e. the average number of processes trying to obtain some CPU time during the last few moments, is less than N. It's thus more friendly towards other tasks that are running in parallel to your compilation.
• 只有当负载平均(即在最后几分钟内试图获得一些CPU时间的进程的平均数量)小于N时，ln才会尝试启动新的命令。

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Make by default starts 1 job. If you want to use all your CPUs/Cores use -j X. If you are afraid your machine gets overloaded add -l Y

使默认启动1个作业。如果您想使用所有cpu /内核，请使用-j x