Limits CPU and memory usage in Linux

View CPU Footprint

Enter top on the command line

You can start top

Top Full Screen Dialog mode can be divided into 3 parts: System Information Bar, command input bar, process list bar.

Use top to view system load

The top command can dynamically monitor the system load, including CPU, memory usage, and resource-intensive process details.

Dynamically View system load (occupy one terminal)

Top

Exit after display

Top-n 1

Output in text format for use by other programs

Top-b

All right, let's see. Limit CPU and memory usage methods

Script content:

The code is as follows
#!/bin/sh Upid= ' Top-bn 1 | grep "^ *[1-9]" | awk ' {if ($ > | | $ > && id-u $ >) print ' For PID in $UPID Todo Renice +10 $PID echo "Renice +10 $PID" Done

I modified the script above to limit the process to the entire server.

Modified script:

The code is as follows
#!/bin/sh Upid= ' Top-bn 1 | grep "^ *[1-9]" | awk ' {if ($ > | | $ >) PRINT $} ' For PID in $UPID Todo Renice +10 $PID echo "Renice +10 $PID" Done

You can run this script in cron and have it checked every minute:

The code is as follows
chmod +x limit.sh Vi/etc/crontab */1 * * * */bin/sh/root/soft_shell/limit.sh

Ps:

N: Number of updates, and will exit top after completion

B: Batch file mode, with "n" Parameters used together, can be used to output the top results to the file

So top-bn 1 is the result of getting the top output once.

grep "^*[1-9]": To get the PID number directly, excluding the table first information.

awk ' {if ($ > | | $ > && id-u $ >) print ':

Process PID with CPU usage greater than 20% or memory usage greater than 25%, and user uid greater than 500.