linux cpu usage
Type the top command:
# top
top - 16:54:34 up 15 days, 13:29, 1 user, load average: 0.30, 0.18, 0.23Tasks: 136 total, 1 running, 134 sleeping, 1 stopped, 0 zombie Cpu(s): 9.5%us, 1.8%sy, 0.0%ni, 88.5%id, 0.0%wa, 0.0%hi, 0.2%si, 0.0%stMem: 1026584k total, 886792k used, 139792k free, 78664k buffers Swap: 2096472k total, 197728k used, 1898744k free, 377476k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 28780 apache 20 0 59432 21m 6236 S 13 2.1 4:00.40 httpd 24553 mysql 20 0 152m 19m 2976 S 9 1.9 979:12.36 mysqld 12124 root 20 0 2200 1028 796 R 0 0.1 0:00.02 top 1 root 20 0 2040 472 444 S 0 0.0 0:10.80 init 2 root 15 -5 0 0 0 S 0 0.0 0:00.00 kthreadd
or with sysstat
For install sysstat in FedoraCore:
# yum install sysstat
after install use command:
# mpstat 1 10
04:59:25 PM CPU %user %nice %sys %iowait %irq %soft %steal %idle intr/s 04:59:26 PM all 7.96 0.00 1.00 0.00 0.00 0.00 0.00 91.04 54.00 04:59:27 PM all 0.00 0.00 0.00 0.00 0.00 0.00 0.00 100.00 42.57 04:59:28 PM all 9.00 0.00 0.00 0.00 0.00 0.00 0.00 91.00 21.00 04:59:29 PM all 8.54 0.00 0.50 0.00 0.00 0.00 0.00 90.95 41.00 04:59:30 PM all 18.00 0.00 1.00 0.00 0.00 0.00 0.00 81.00 78.0 04:59:31 PM all 0.00 0.00 0.50 0.00 0.00 0.50 0.00 99.01 78.00
who is monopolizing the CPUs ?
use:
# ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10
%CPU PID USER COMMAND 4.3 24553 mysql /usr/libexec/mysqld --defaults-file=/etc/my.cnf --basedir=/usr --datadir=/var/lib/mysql --user=mysql --pid-file=/var/run/mysqld/mysqld.pid --skip-external-locking --socket=/var/lib/mysql/mysql.sock 1.2 32501 apache /usr/sbin/httpd 1.2 28803 apache /usr/sbin/httpd 1.2 28780 apache /usr/sbin/httpd 1.2 2825 apache /usr/sbin/httpd 1.1 5893 apache /usr/sbin/httpd 1.1 4080 apache /usr/sbin/httpd 1.1 4042 apache /usr/sbin/httpd 1.1 4029 apache /usr/sbin/httpd
