Shulou(Shulou.com)06/01 Report--

Xiaobian to share with you how to check linux system card, I believe most people still do not know how, so share this article for everyone's reference, I hope you have a lot of harvest after reading this article, let's go to understand it together!

1. View memory usage

free -g

When you observe that the free column is 0, it means that the memory is basically eaten up, so release the memory.

Free memory:

sync

echo 3 > /proc/sys/vm/drop_caches

Sync means to synchronize the contents of the memory buffer to disk immediately, but you can do it a few more times for safety.

2. View disk usage

df -h

When disk usage is found to be high, it is necessary to free up disk space and delete unnecessary files (see disk space occupied by various directories)

du command: View disk occupancy of directories and files

View disk occupancy for a specified directory:

du -sh /home/zhubao

View disk usage for all first-level subdirectories and files in the current directory:

du -sh *

-h or-human-readable in K, M, G units, improving readability of information;

-s or-summarize Displays only the total, i.e. the size of the current directory.

3. View disk IO usage

iostat -x 1

1 means refresh once a second

When %util on the rightmost side is found to be very high, it means IO is very high. If you want to see which process occupies IO, execute iotop command to check.

4. view CPU usage

top

The table in the red box in the figure shows CPU usage. The %id on the far right indicates the remaining CPU. If it is very low, it means that the CPU has been eaten up. Press shift+p on the top interface to sort the processes using CPU. You can see which processes occupy more CPU.

Of course, the top command can also view information such as memory, which is more powerful and will be described in detail later.

The above is "linux system is very card how to investigate" all the contents of this article, thank you for reading! I believe that everyone has a certain understanding, hope to share the content to help everyone, if you still want to learn more knowledge, welcome to pay attention to the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.