Top得出CPU使用率超高：
top - 16:41:04 up 184 days, 21:31, 2 users, load average: 19.97, 18.38, 18.36
Tasks: 584 total, 1 running, 583 sleeping, 0 stopped, 0 zombie
Cpu(s): 0.0%us, 0.0%sy, 41.2%ni, 58.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 65923008k total, 34622724k used, 31300284k free, 315684k buffers
Swap: 33030136k total, 0k used, 33030136k free, 24200968k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
28518 root 20 0 1652m 62m 1172 S 2014.5 0.1 49701,58 mysql_test
24878 root 20 0 15416 1616 896 R 3.9 0.0 0:00.02 top
1 root 20 0 19228 1512 1220 S 0.0 0.0 0:02.95 init
CPU使用率很高很高。

[root@db-m1-slave-1 ~]# ps -eaf|grep mysql
root 24917 24834 0 16:42 pts/1 00:00:00 grep mysql
root 26452 1 0 2013 ? 00:00:00 /bin/sh /usr/local/mysql/bin/mysqld_safe --datadir=/home/data/mysql/data --pid-file=/usr/local/mysql/mysqld.pid
mysql 27584 26452 0 2013 ? 01:56:49 /usr/local/mysql/bin/mysqld --basedir=/usr/local/mysql --datadir=/home/data/mysql/data --plugin-dir=/usr/local/mysql/lib/plugin --user=mysql --log-error=/usr/local/mysql/mysqld.log --open-files-limit=8192 --pid-file=/usr/local/mysql/mysqld.pid --socket=/usr/local/mysql/mysql.sock --port=3306
root 28518 1 99 2013 ? 2070-22:25:20 ./mysql_test --config=./cfg --threads=20 -B

看到此./mysql_test指令碼在執行，find / -name mysql_test

[root@db-m1-slave-1 ~]# find / -name mysql_test
/usr/local/mysql/test/mysql_test
[root@db-m1-slave-1 ~]#

[root@db-m1-slave-1 test]# more mysql_test
******** mysql_test: Not a text file ********

查詢到此mysql_test是使用了一個mysql的使用者資訊收集的外掛，上傳到mysql官網了,是個軟體執行資訊反饋的那種功能。
只要kill掉就沒事了。

MySQL5.6.12造成CPU的使用率 2000%的原因

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