Opcache - why can there be constantly number of cached files = number of misses?

Question

PHP

costs opcache on PHP 5.4.45-0+deb7u1
settings:
opcache.memory_consumption=128
opcache.interned_strings_buffer=8
opcache.max_accelerated_files=4000
opcache.file_update_protection = 180
opcache.revalidate_freq=600
opcache.fast_shutdown= 1
opcache.enable_cli
preferred_memory_model=
Stable for some reason number of cached files = number of misses
What could be the reason?

Answer 1

The reason is that php like fastcgi.
If anyone needs it.