linux deployed lnmp
Recently found that the server CPU usage is very high,
Use strace -cp 30811 to find out
There is one access that is the most occupied
Call strace -T -e access -p 30811 again, the result is as shown: 
But I couldn’t find anywhere in the program where access is used
I couldn’t find the access function when looking for PHP functions.
I really don’t know who is calling this thing, and the CPU remains high every day. So melancholy.
I hope someone who knows can help. Help points out who is calling, is it the bottom layer of PHP or Linux or something else?
Grateful.
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Generally, php is occupied once every time a page is opened. Are you related to processes, scheduled tasks, etc. in cli mode?
Access is a Linux system call used to check the user's permissions on a file. There are many access errors in the output of strace -cp. Is it because some files do not have access permissions?
In addition, I personally feel that when PHP is accessed through fastcgi, the CPU is usually higher (especially on Windows).