CentOS 6
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Limit CPU Usage
2013/06/21
 
Limit CPU Usage with CPULimit.
[1] Install CPULimit
[root@dlp ~]#
yum --enablerepo=epel -y install cpulimit
 
# install from EPEL
[2] Create a program to test CPULimit.
Be careful! : This program loops endlessly and uses Max CPU usage, so test it on a test machine.
[root@dlp ~]#
vi test.sh
#!/bin/bash
while :; do :; done;
[root@dlp ~]#
chmod 700 test.sh

[root@dlp ~]#
./test.sh &

[1] 1409
[root@dlp ~]#
top 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1409 root      20   0  103m 1256 1084 R 99.1  0.1   0:12.86 test.sh
    1 root      20   0 19228 1464 1184 S  0.0  0.1   0:00.46 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.00 kthreadd
# test.sh uses over 99% CPU usage like above.
[3] Limit CPU usage with CPULimit.
# limit to 20% for CPU usage of test.sh [ cpulimit -l (percentage) -p (process ID) ]

[root@dlp ~]#
cpulimit -l 20 -p 1409 &

[4] 1410
[root@dlp ~]#
top 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1409 root      20   0  103m 1252 1084 R 19.8  0.1   0:34.47 test.sh
    1 root      20   0 19228 1464 1184 S  0.0  0.1   0:00.46 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.00 kthreadd
# just changed to under 20% usage above.
[4] Down CPULimit's process if you'd like to release limitation of CPU usage by CPULimit.
[root@dlp ~]#
ps -ef | grep cpulimit 

root      1410  1162  0 15:11 ttyS0    00:00:00 cpulimit -l 20 -p 1409
root      1434  1417  0 15:21 ttyS0    00:00:00 grep cpulimit
[root@dlp ~]#
kill 1410

Exiting...
[root@dlp ~]#
top 

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1409 root      20   0  103m 1252 1084 R 100.0  0.1   3:19.51 test.sh
    1 root      20   0 19228 1464 1184 S  0.0  0.1   0:00.46 init
    2 root      20   0     0    0    0 S  0.0  0.0   0:00.00 kthreadd
 
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