限制 某进程 使用最大CPU资源 _ cpulimit _ 参考

I do not issue any guarantee that this will work for you!

I will run all commands in this tutorial as the root user, so either log in as root directly (Debian) or become root like this (Ubuntu):

sudo su

If your machine has one processor you can limit the percentage from 0% to 100%, which means that if you set for example 50%, your process cannot use more than 500 ms of cpu time for each second. But if your machine has four processors, percentage may vary from 0% to 400%, so setting the limit to 200% means to use no more than half of the available power. In any case, the percentage is the same of what you see when you run top.

cpulimit should run at least with the same user running the controlled process. But it is much better if you run cpulimit as root, in order to have a higher priority and a more precise control.

cpulimit is available as a package for Debian and Ubuntu, so it can be installed as follows:

aptitude install cpulimit

Take a look at the cpulimit man page to learn how to use it:

man cpulimit

NAME

cpulimit -- limits the CPU usage of a process

SYNOPSIS

cpulimit TARGET [OPTIONS...]

DESCRIPTION

TARGET must be exactly one of these:

-p, --pid=N

pid of the process

-e, --exe=FILE

name of the executable program file

-P, --path=PATH

absolute path name of the executable program file

OPTIONS

-l, --limit=N

percentage of CPU allowed from 0 to 100 (mandatory)

-v, --verbose

show control statistics

-z, --lazy

exit if there is no suitable target process, or if it dies

-h, --help

display this help and exit

EXAMPLES

Assuming  you  have  started "foo --bar" and you find out with top(1) or ps(1) that this process uses all your CPU

time you can either

# cpulimit -e foo -l 50

limits the CPU usage of the process by acting on the executable program file (note: the argument "--bar" is

omitted)

# cpulimit -p 1234 -l 50

limits the CPU usage of the process by acting on its PID, as shown by ps(1)

# cpulimit -P /usr/bin/foo -l 50

same as -e but uses the absolute path name

AUTHOR

This  manpage was written for the Debian project by gregor herrmann <[email protected]> but may be used

by others.

Now let's assume we want to limit the process apache2 to 30%. This is how we do it:

cpulimit -e apache2 -l 30

The -e switch takes the name of the executable program file. You can take that name from the output of the top command.

Instead of using the name of the executable program file, we can use the process ID with the -p switch. You can find out the process ID of the apache2 process as follows:

ps aux

or

ps aux | grep apache2

Let's assume the apache2 process ID is 4510; we can then limit that process to 30% CPU usage as follows:

cpulimit -p 4510 -l 30

Instead of using the name of the executable file (-e) of the process ID (-p), we can also pass the absolute path name of the executable program file to cpulimit with the -P switch; the absolute path name of the apache2 executable is /usr/sbin/apache2 so we'd use the following command:

cpulimit -P /usr/sbin/apache2 -l 30

Please note that cpulimit will run in the foreground of your terminal until you terminate it with CTRL+C - terminating it will also remove any CPU limits.

source : http://www.howtoforge.com/how-to-limit-cpu-usage-of-a-process-with-cpulimit-debian-ubuntu