Hi,
This question is about PHP-FPM.
Is a graceful reload (SIGUSR2) a reliable way to clear OPcache and the
realpath cache?
Currently, I restart PHP-FPM pools to clear OPcache and realpath cache
when `opcache.validate_timestamps = Off`. This causes 503s for users.
I'd like to queue waiting requests instead by using SIGUSR2, which does
a graceful reload.
I've found that sending SIGUSR2 to the master process clears OPcache.
php-fpm(8) says:
```
SIGUSR2
graceful reload of all workers + reload of fpm conf/binary
```
Technically, OPcache is held in the master process. So does 'graceful
reload of all workers' also mean the master process?
--
With kind regards,
William Edwards
