在* nix中，是什么原因导致“睡眠"?在最高指挥? [英] In *nix, what causes "sleeping" in top command?

问题描述

是什么原因导致我在top中看到的这些sleeping进程?如果我要调用PHP的sleep()函数，那会增加我在top中看到的sleeping计数吗? sleeping中的高位数是否有任何不利之处?

What causes these sleeping processes that I see in top? If I were to call PHP's sleep() function, would that add to the sleeping count I see in top? Are there any disadvantages to having a high number in sleeping?

推荐答案

进程被阻塞时正在休眠，正在等待某些东西.例如，它可能已调用read()，并且正在等待数据从网络流中到达.

A process is sleeping when it is blocked, waiting for something. For example, it might have called read() and is waiting on data to arrive from a network stream.

sleep()确实是使进程休眠一段时间的一种方法.但是，休眠是除受计算密集的所有进程之外所有进程的正常状态-休眠本质上是进程在不执行任何其他操作时所执行的操作.这是大多数进程处于休眠状态的正常状态-如果不是 情况，则表明您需要更多的CPU功能.

sleep() is indeed one way to have your process sleep for a while. Sleeping is, however, the normal state of all but heavily compute-bound processes - sleeping is essentially what a process does when it isn't doing anything else. It's the normal state of affairs for most of your processes to be sleeping - if that's not the case, it tends to indicate that you need more CPU horsepower.

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