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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.