稍微设置早点时间 还是稍微设晚点时间 是不是缓存时间更长了 是不是速度更快了 时区 有大用 好像没用

On the 1st of July 2012, a leap second was added to the current UTC-time to compensate for the slowing rotation of the earth due to the tides. When running ntp (or ntpd) this second was added to your computer's/server's clock. MySQLd does not seem to like this extra second on some OS'es, and yields a high CPU load. The quick fix is (as root):
 

$ /etc/init.d/ntpd stop
$ date -s "`date`"           #这里设稍早的时间吧
$ /etc/init.d/ntpd start

来自 https://stackoverflow.com/questions/1282232/mysql-high-cpu-usage