Setting up Jitl

To activate Jitl on a Plesk server with PHP 8, proceed as follows:

1. Execute the following command on your server via SSH:

   echo -e 'opcache.jit_buffer_size=256M\nopcache.jit=1255' > /opt/plesk/php/8.0/etc/php.d/opcache_jit.ini

2. Under “Tools & Settings => PHP Settings => PHP 8.0”, add a space in PHP.ini to rebuild all web configurations.
3. Restart the FPM service:

   service plesk-php80-fpm reload

4. Deactivate the Disable_Functions in the PHP settings of the affected domain and do not set anything there.
5. Upload the following file and test if Jit works now:
   test.php

   <?php
   print_r(opcache_get_status()['jit']);
   ?>