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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.
相關(guān)問題拓展閱讀：
- 如何查看CPU個(gè)數(shù)，是幾核的
如何查看CPU個(gè)數(shù)，是幾核的
最簡單的方法就是按ctrl
alt
del這三個(gè)鍵。皮旁改
調(diào)出任務(wù)管理器?？从袔讉€(gè)框框一般燃判就是幾核的。
英特爾cpu有超線程，i3是雙核也顯示四個(gè)框。啟櫻i7是四核顯示8個(gè)框。
任務(wù)管理器中選亮納擇“性能”寬辯，如下圖所示。
在“性能”的“內(nèi)核”這一欄就能看到電慎鍵缺腦的CPU是幾核的。
(一)概念
①
物理cpu
實(shí)際server中插槽上的cpu個(gè)數(shù)
物理cpu數(shù)量，可以數(shù)不重復(fù)的
physical
id
有幾個(gè)
②
邏輯cpu
/proc/cpuinfo
用來存儲(chǔ)cpu硬件信息的
信息內(nèi)容分別列出了processor
–processor
n
的規(guī)格。這里需要注意，n是邏輯cpu數(shù)
一般情況，我們認(rèn)為一顆cpu可以有多核，加上intel的超線程技術(shù)(ht),
可以在邏輯上再分一倍數(shù)量的cpu
core出來
邏輯cpu數(shù)量=物理cpu數(shù)量
x
cpu
cores
這個(gè)規(guī)格值
x
2(如果支持并開啟ht)
備注一下：linux下top查看的cpu也是邏輯cpu個(gè)數(shù)
③
cpu核數(shù)
一塊cpu上面能處理數(shù)據(jù)的芯片組的數(shù)量、比如現(xiàn)在的i5
760,是雙核心四線程的cpu、而
i5
2250
是四核心四線程的cpu
一般來說，物理cpu個(gè)數(shù)×每顆核數(shù)就應(yīng)該等于邏輯cpu的個(gè)數(shù)，如果不相等的話，則表示服務(wù)器的cpu支持超線程技術(shù)
二
查看cpu信息
當(dāng)我們
cat
/proc/cpuinfo
時(shí)、
具有相同core
id的cpu是同一個(gè)core的超線程
具有相同physical
id的cpu是同一個(gè)茄告cpu封裝的線程或核心
三
下面舉例說明
①
查看物理cpu的個(gè)數(shù)
#cat
/proc/cpuinfo
|grep
“physical
id”|sort
|uniq|wc
-l
②
查看邏輯cpu的個(gè)數(shù)
#cat
/proc/cpuinfo
|grep
“processor”|wc
-l
③
查看cpu是幾核
#cat
/proc/cpuinfo
|grep
“cores”|uniq
我這里應(yīng)首中該是2個(gè)cpu,每個(gè)cpu有6個(gè)core,應(yīng)該是intel的u,支持超者納山線程,所以顯示24
關(guān)于linux top cpu個(gè)數(shù)的介紹到此就結(jié)束了，不知道你從中找到你需要的信息了嗎 ？如果你還想了解更多這方面的信息，記得收藏關(guān)注本站。
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