PHP takes up a few ideas of CPU high

Today, when I was doing the test, I suddenly got a card, and I looked at it with top.

PHP takes up more than 70% CPU, the following steps:

1. Strace-o output.txt-t-tt-e-c trace=all-p PID

Result: checked the following. has been executing the read, write operation SQL statement

2. ll/proc/25066/fd/

The result: It's all sockets, it doesn't feel right.

3. Strace-t-tt-c-P PID

When interrupted with Ctrl + C, the result is: Read, write occupies the most time,

Here I'm kinda sure it's a SQL problem, put a few PHP persistent queue processes off the CPU occupancy rate immediately down

In fact, it is still possible to view the next php-fpm slow_log slow log but I looked under our configuration actually turned off.

In summary, the most used above is the use of Strace, specific usage reference: http://www.cnblogs.com/ggjucheng/archive/2012/01/08/2316692.html

PHP takes up a few ideas of CPU high