Linux Top：快速了解 CPU 占用数量 (linux top cpu个数)

Linux Top: A Quick Guide to CPU Usage

As the use of Linux operating system becomes increasingly popular, it is important to understand the various tools and utilities that can be used to monitor system performance. One such utility is Linux Top, which provides real-time information about system processes and their respective CPU usage.

In this article, we will explore the basics of Linux Top and how it can be used to quickly identify CPU usage on your system.

What is Linux Top?

Linux Top is a command-line utility that provides real-time information about the processes running on a Linux system. It shows data about the CPU usage, memory usage, and other system resources being utilized by each process. It is a useful tool for system administrators and developers to monitor system performance and identify issues before they become critical.

How to Use Linux Top

To start using Linux Top, open your terminal and type “top” without the quotes. This will launch the utility and provide you with a live view of the processes running on your system.

The default view of Linux Top displays the processes in order of their CPU usage, with the most CPU-intensive processes at the top. The information displayed includes the process ID, user, CPU usage, memory usage, and other system resources being utilized by each process.

You can also sort the view by other system resources such as memory or disk usage by pressing the corresponding keys. For example, pressing “M” will sort the processes by memory usage, while pressing “D” will sort them by disk usage.

Another useful feature of Linux Top is its ability to filter the results based on a specific process name or PID. To filter by name, press the “O” key and then enter the name of the process you want to filter. To filter by PID, press the “F” key and then enter the PID number.

Overall, Linux Top is a powerful utility that provides real-time information about system processes and their respective CPU usage. It is an essential tool for system administrators and developers who need to monitor system performance and identify issues before they become critical.

相关问题拓展阅读：

• 如何查看CPU个数，是几核的

如何查看CPU个数，是几核的

最简单的方法就是按ctrl

alt

del这三个键。皮旁改

调出任务管理器。看有几个框框一般燃判就是几核的。

英特尔cpu有超线程，i3是双核也显示四个框。启樱i7是四核显示8个框。

任务管理器中选亮纳择“性能”宽辩，如下图所示。

在“性能”的“内核”这一栏就能看到电慎键缺脑的CPU是几核的。

(一)概念

①

物理cpu

实际server中插槽上的cpu个数

物理cpu数量，可以数不重复的

physical

id

有几个

②

逻辑cpu

/proc/cpuinfo

用来存储cpu硬件信息的

信息内容分别列出了processor

–processor

n

的规格。这里需要注意，n是逻辑cpu数

一般情况，我们认为一颗cpu可以有多核，加上intel的超线程技术(ht),

可以在逻辑上再分一倍数量的cpu

core出来

逻辑cpu数量=物理cpu数量

x

cpu

cores

这个规格值

x

2(如果支持并开启ht)

备注一下：linux下top查看的cpu也是逻辑cpu个数

③

cpu核数

一块cpu上面能处理数据的芯片组的数量、比如现在的i5

760,是双核心四线程的cpu、而

i5

2250

是四核心四线程的cpu

一般来说，物理cpu个数×每颗核数就应该等于逻辑cpu的个数，如果不相等的话，则表示服务器的cpu支持超线程技术

二

查看cpu信息

当我们

cat

/proc/cpuinfo

时、

具有相同core

id的cpu是同一个core的超线程

具有相同physical

id的cpu是同一个茄告cpu封装的线程或核心

三

下面举例说明

①

查看物理cpu的个数

#cat

/proc/cpuinfo

|grep

“physical

id”|sort

|uniq|wc

-l

②

查看逻辑cpu的个数

#cat

/proc/cpuinfo

|grep

“processor”|wc

-l

③

查看cpu是几核

#cat

/proc/cpuinfo

|grep

“cores”|uniq

我这里应首中该是2个cpu,每个cpu有6个core,应该是intel的u,支持超者纳山线程,所以显示24

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