Skip to content

top

top(1) - Linux man page

Overview

The remaining Table of Contents

1 COMMAND-LINE Options

2 FIELDS / Columns

a. DESCRIPTIONS of Fields

b. SELECTING and ORDERING Columns

3 INTERACTIVE Commands

a. GLOBAL Commands

b. SUMMARY Area Commands

c. TASK Area Commands

d. COLOR Mapping

4 ALTERNATE-DISPLAY Mode

a. WINDOWS Overview

b. COMMANDS for Windows

5 FILES

a. SYSTEM Configuration File

b. PERSONAL Configuration File

6 STUPID TRICKS Sampler

a. Kernel Magic

b. Bouncing Windows

c. The Big Bird Window

7 BUGS

8 HISTORY Former top

9 AUTHOR

10 SEE ALSO

1. COMMAND-LINE Options

2. FIELDS / Columns

2a. DESCRIPTIONS of Fields

2b. SELECTING and ORDERING Columns

2c. SUMMARY Area Fields

3. INTERACTIVE Commands

3a. GLOBAL Commands

3b. SUMMARY Area Commands

'1'

Toggle_Single/Separate_Cpu_States -- On/Off

NOTE: 简单说来，键入1，表示我们想要查看: Show CPU Usage on all cores，这是我在阅读haydenjames Linux server performance: Is disk I/O slowing your application? 时发现的，它的视频中展示了CPU-wise usage info。下面是一些对此进行说明的文章:

top %CPU over 100%

下面文章对这个问题进行了解释:

下面是我觉得最好的回答:

A:

%CPU -- CPU Usage : The percentage of your CPU that is being used by the process. By default, top displays this as a percentage of a single CPU. On multi-core systems, you can have percentages that are greater than 100%. For example, if 3 cores are at 60% use, top will show a CPU use of 180%. See here for more information. You can toggle this behavior by hitting Shifti while top is running to show the overall percentage of available CPUs in use.

Source for above quote.

You can use htop instead.

To answer your question about how many cores and virtual cores you have:

According to your lscpu output:

  • You have 32 cores (CPU(s)) in total.
  • You have 2 physical sockets (Socket(s)), each contains 1 physical processor.
  • Each processor of yours has 8 physical cores (Core(s) per socket) inside, which means you have 8 * 2 = 16 real cores.
  • Each real core can have 2 threads (Thread(s) per core), which means you have real cores * threads = 16 * 2 = 32 cores in total.

So you have 32 virtual cores from 16 real cores.

Also see this, this and this link.