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If the file is php then yes caching could be Zend Opcache related, the default revalidate frequency is 180 seconds PHP: OPcache - Manual PHP: Runtime Configuration - Manual Code (Text): php --ri 'Zend OPcache' Zend OPcache Opcode Caching => Disabled Optimization => Disabled SHM Cache => Enabled File Cache => Disabled Startup Failed => Opcode Caching is disabled for CLI Directive => Local Value => Master Value opcache.enable => On => On opcache.use_cwd => On => On opcache.validate_timestamps => On => On opcache.inherited_hack => On => On opcache.dups_fix => Off => Off opcache.revalidate_path => Off => Off opcache.log_verbosity_level => 1 => 1 opcache.memory_consumption => 64 => 64 opcache.interned_strings_buffer => 8 => 8 opcache.max_accelerated_files => 8000 => 8000 opcache.max_wasted_percentage => 5 => 5 opcache.consistency_checks => 0 => 0 opcache.force_restart_timeout => 180 => 180 opcache.revalidate_freq => 180 => 180 opcache.file_update_protection => 2 => 2 opcache.preferred_memory_model => no value => no value opcache.blacklist_filename => no value => no value opcache.max_file_size => 0 => 0 opcache.protect_memory => 0 => 0 opcache.save_comments => 1 => 1 opcache.fast_shutdown => 1 => 1 opcache.optimization_level => 0x7FFFBFFF => 0x7FFFBFFF opcache.enable_file_override => On => On opcache.enable_cli => Off => Off opcache.error_log => no value => no value opcache.restrict_api => no value => no value opcache.lockfile_path => /tmp => /tmp opcache.file_cache => no value => no value opcache.file_cache_only => 0 => 0 opcache.file_cache_consistency_checks => 1 => 1 opcache.huge_code_pages => Off => Off You can exclude a file or path from Zend Opcache caching completely via blacklist option too To customise Zend Opcache settings see the instructions to create your own .ini settings file to retain the changes at https://centminmod.com/phpfpm.html#customphpini Example order of php .ini files applied via php --ini command Code (Text): php --ini Configuration File (php.ini) Path: /usr/local/lib Loaded Configuration File: /usr/local/lib/php.ini Scan for additional .ini files in: /etc/centminmod/php.d Additional .ini files parsed: /etc/centminmod/php.d/a_customphp.ini, /etc/centminmod/php.d/curlcainfo.ini, /etc/centminmod/php.d/geoip.ini, /etc/centminmod/php.d/igbinary.ini, /etc/centminmod/php.d/imagick.ini, /etc/centminmod/php.d/mailparse.ini, /etc/centminmod/php.d/memcache.ini, /etc/centminmod/php.d/memcached.ini, /etc/centminmod/php.d/redis.ini, /etc/centminmod/php.d/zendopcache.ini If i want to override opcache.revalidate_freq 180 seconds default, I'd create a .ini file after /etc/centminmod/php.d/zendopcache.ini alphabetically i.e. /etc/centminmod/php.d/zzendopcache.ini So ordered after zendopcache.ini Code (Text): php --ini Configuration File (php.ini) Path: /usr/local/lib Loaded Configuration File: /usr/local/lib/php.ini Scan for additional .ini files in: /etc/centminmod/php.d Additional .ini files parsed: /etc/centminmod/php.d/a_customphp.ini, /etc/centminmod/php.d/curlcainfo.ini, /etc/centminmod/php.d/geoip.ini, /etc/centminmod/php.d/igbinary.ini, /etc/centminmod/php.d/imagick.ini, /etc/centminmod/php.d/mailparse.ini, /etc/centminmod/php.d/memcache.ini, /etc/centminmod/php.d/memcached.ini, /etc/centminmod/php.d/redis.ini, /etc/centminmod/php.d/zendopcache.ini, /etc/centminmod/php.d/zzendopcache.ini In /etc/centminmod/php.d/zzendopcache.ini add value say 10 seconds Code (Text): opcache.revalidate_freq = 10 Note though reducing revalidation frequency lowers performance of caching all the time 24/7. Best way is just to restart php-fpm and nginx after file updates which are done manually via command shortcut Code (Text): nprestart After restart recheck value is now at 10 seconds Code (Text): php --ri 'Zend OPcache' Zend OPcache Opcode Caching => Disabled Optimization => Disabled SHM Cache => Enabled File Cache => Disabled Startup Failed => Opcode Caching is disabled for CLI Directive => Local Value => Master Value opcache.enable => On => On opcache.use_cwd => On => On opcache.validate_timestamps => On => On opcache.inherited_hack => On => On opcache.dups_fix => Off => Off opcache.revalidate_path => Off => Off opcache.log_verbosity_level => 1 => 1 opcache.memory_consumption => 64 => 64 opcache.interned_strings_buffer => 8 => 8 opcache.max_accelerated_files => 8000 => 8000 opcache.max_wasted_percentage => 5 => 5 opcache.consistency_checks => 0 => 0 opcache.force_restart_timeout => 180 => 180 opcache.revalidate_freq => 10 => 10 opcache.file_update_protection => 2 => 2 opcache.preferred_memory_model => no value => no value opcache.blacklist_filename => no value => no value opcache.max_file_size => 0 => 0 opcache.protect_memory => 0 => 0 opcache.save_comments => 1 => 1 opcache.fast_shutdown => 1 => 1 opcache.optimization_level => 0x7FFFBFFF => 0x7FFFBFFF opcache.enable_file_override => On => On opcache.enable_cli => Off => Off opcache.error_log => no value => no value opcache.restrict_api => no value => no value opcache.lockfile_path => /tmp => /tmp opcache.file_cache => no value => no value opcache.file_cache_only => 0 => 0 opcache.file_cache_consistency_checks => 1 => 1 opcache.huge_code_pages => Off => Off Any php related setting can override and customised this way as well
Code (Text): php --ini Configuration File (php.ini) Path: /usr/local/lib Loaded Configuration File: /usr/local/lib/php.ini Scan for additional .ini files in: /etc/centminmod/php.d Additional .ini files parsed: /etc/centminmod/php.d/a_customphp.ini, /etc/centminmod/php.d/curlcainfo.ini, /etc/centminmod/php.d/geoip.ini, /etc/centminmod/php.d/igbinary.ini, /etc/centminmod/php.d/imagick.ini, /etc/centminmod/php.d/mailparse.ini, /etc/centminmod/php.d/memcache.ini, /etc/centminmod/php.d/memcached.ini, /etc/centminmod/php.d/redis.ini, /etc/centminmod/php.d/zendopcache.ini