正常运行时间VS。 CPU 使用率最高：我应该相信什么，为什么会出现这种差异？
我的嵌入式设备遇到一些性能问题：
# uptime
14:59:39 up 5:37, load average: 1.60, 1.50, 1.53
对于单核系统来说非常糟糕......:-p！然而，如果我检查顶级实用程序，我总是有 80% 左右的空闲时间！
Mem: 49020K used, 75960K free, 0K shrd, 0K buff, 21476K cached
CPU: 12.5% usr 4.8% sys 0.0% nic 81.7% idle 0.0% io 0.9% irq 0.0% sirq
Load average: 1.30 1.42 1.51 1/80 18696
读了一些文章后，我宁愿相信 uptime 命令。但为什么会出现这种差异呢？我的CPU真的闲置吗？？
I'm having some performance issue on my embedded device:
# uptime
14:59:39 up 5:37, load average: 1.60, 1.50, 1.53
Very bad for a monocore system ... :-p! However if I check with the top utility, I always have an idle time around 80% !
Mem: 49020K used, 75960K free, 0K shrd, 0K buff, 21476K cached
CPU: 12.5% usr 4.8% sys 0.0% nic 81.7% idle 0.0% io 0.9% irq 0.0% sirq
Load average: 1.30 1.42 1.51 1/80 18696
After reading some articles, I would better believe the uptime command. But why this difference? Is my CPU really idle ??!
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（3）
负载不仅衡量有多少进程处于 R 状态（可运行，可以使用 CPU 时间），还衡量有多少进程处于 D 状态（不可中断睡眠，通常等待 IO）。您可能有一个处于 D 状态的进程，该进程正在贡献负载，但不使用 cpu。此命令将向您显示当前所有导致负载的进程：
查看该输出并查看是否有处于 D 状态的命令（在第 8 列中）
Load is not just a measure of how many processes in the R state (runnable, could use CPU time), but also processes in the D state (uninterruptable sleep, usually waiting for IO). You likely have a process in the D state which is contributing to load, but not using cpu. This command would show you all the current processes which are contributing to load:
Have a look at that output and see if you have commands in the D state (in the 8th column)
您最好了解“平均负载”代表什么。
简而言之，就是多个进程，在等待某个资源，而这个资源可能是CPU、硬盘、串口……
you'd better to learn what 'load average' stands for.
in short, it's a number of processes, waiting for some resource, and the resource may be CPU, HDD, serial port, ...
平均负载似乎有点高，这可能意味着 cpu 正忙于 I/O（磁盘/网络）或线程管理（您可能运行太多）。
The Load average seems a little high, that could meen that the cpu is busy with things like I/O(disk/network) or thread managment(you may have too meny running).