OPcache

Existe documentación diferente para varias versiones de Moodle: Esta página es acerca de OPcache para Moodle 3.5 y más modernos. Para la documentación anterior, vaya a 34/OPcache y 29/OPcache .

La extensión estándar OPCache está altamente recomendada; desde Moodle 2.6, es la única solución soportada oficialmente por los desarrolladores de PHP. Los beneficios son aumento del desempeño y significativamente menor uso de memoria. Sin embargo, las extensiones para cacheo de opcode (incluyendo OPcache, eAccelerator y APC) no son compatibles con los servidores configurados para usar algunos tipos comunes de manejadores PHP de alta seguridad, tales como suPHP (que se emplea por defecto en servidores Linux WHM / cPanel ). Esto es muy comun en servidores compartidos.

Instalación

La extensión OPcache es distribuída como parte de PHP 5.5.0 y posteriores. Está disponible también para versiones estables más antiguas de PHP desde PECL bajo el nombre original ZendOPcache.

NOTA: Si Usted está corriendo PHP 5.3 o 5.4 Usted puede ignorar con seguridad el mensaje de revisión del Entorno sobre OpCache. Sin embargo, se recomienda que actualice PHP a 5.5 o posterior; debido a los muchos problemas descritos con PHP 5.2 y 5.3, donde el actualizar PHP resultó ser la solución más sencilla.

Configuración

[opcache] opcache.enable = 1 opcache.memory_consumption = 128 opcache.max_accelerated_files = 10000 opcache.revalidate_freq = 60

Required for Moodle

opcache.use_cwd = 1 opcache.validate_timestamps = 1 opcache.save_comments = 1 opcache.enable_file_override = 0

If something does not work in Moodle

opcache.revalidate_path = 1 ; May fix problems with include paths

opcache.mmap_base = 0x20000000 ; (Windows only) fix OPcache crashes with event id 487

Experimental for Moodle 2.6 and later

opcache.fast_shutdown = 1

opcache.enable_cli = 1 ; Speeds up CLI cron

opcache.load_comments = 0 ; May lower memory use, might not be compatible with add-ons and other apps.

When using non-Windows platforms, you have to use the zend_extension configuration to load the OPcache extension into PHP by adding to php.ini. zend_extension=/full/path/to/opcache.so

When using IIS you will need PHP 5.5 and you will need to add the extension for opcache under the ExtensionList section of the php.ini file. For PHP 5.3 and 5.4 you can download the binaries separately from [1] and you will also need to enter full absolute path to the module dll in php.ini.

[ExtensionList] ... zend_extension=php_opcache.dll

memory_consumption

From: PHP's OPCache extension review

• The size of the memory segment can be told using the opcache.memory_consumption INI setting (Megabytes). Size it big, don't hesitate to give space. Never ever run out of shared memory space, if you do, you will lock your processes, we'll get back to that later.

• Size the shared memory segment according to your needs, don't forget that a production server dedicated to PHP processes may bundle several dozens of Gigabytes of memory, just for PHP. Having a 1Gb shared memory segment (or more) is not uncommon, it will depend on your needs, but if you use a modern application stack, aka framework based, with lots of dependencies etc... , then use at least 1Gb of shared memory.

Having that in mind, set opcache.memory_consumption to a value high enough to avoid filling it up (as long as your RAM usage allows you to), and then monitor the OPCache to adjust that value to its optimal size. As the total size of the PHP files in a standard Moodle 3.5 is almost 90MB, setting this value higher than that can be a good idea. Take into account that the PHP files of the plugins and those on the MoodleData folder (language pack files...) also count, so these values can be different on each installation. If you have several instances of Moodle you should multiply that value by the number of instances.

Tip: If using Linux, you can know the total size of the PHP files of a folder using this command: find ./ -type f -name "*.php" -printf "%s\n" | gawk -M '{t+=$1}END{print t}' | numfmt --to=si

max_accelerated_files

From: php.net max-accelerated-files

• The maximum number of keys (and therefore scripts) in the OPcache hash table. The actual value used will be the first number in the set of prime numbers { 223, 463, 983, 1979, 3907, 7963, 16229, 32531, 65407, 130987 } that is greater than or equal to the configured value. The minimum value is 200. The maximum value is 100000 in PHP < 5.5.6, and 1000000 in later versions.

As Moodle 3.5 contains almost 10.000 php files it is recommended above that opcache.max_accelerated_files should be set to 10000 to accommodate this (16229 will actually be used as per the explanation above). If you have several instances of Moodle you should multiply that value by the number of instances.

If many additional plugins are installed so that your total PHP files exceed 16229 then the next most suitable value for max_accelerated_files should be used. Tip: If using Linux, you can know the total PHP files of your Moodle using this command: find ./ -type f | grep -E ".*\.php$" | sed -e 's/.*\(\.[a-zA-Z0-9]*\)$/\1/' | sort | uniq -c | sort -n

Vea también

• PECL ZendOPcache
• Windows builds for PHP 5.3-5.4

Forum discussions:

• Using Moodle OPcache: Memory Usage = 100% (is this good or bad?)
• OPCode cache