APCu設定
ユーザーデータを共有メモリにキャッシュすることで高速化する。
APCuインストール
dnf --enablerepo=epel install php-pecl-apcu
APCu設定
基本的にはデフォルトのままで問題無い。
/etc/php.d/40-apcu.ini
; Enable APCu extension module
extension = apcu.so
; This can be set to 0 to disable APCu
apc.enabled=1
; Setting this enables APCu for the CLI version of PHP
; (Mostly for testing and debugging).
;apc.enable_cli=0
; Sets the path to text files containing caches to load from disk upon
; initialization of APCu. preload_path should be a directory where each
; file follows $key.data where $key should be used as the entry name
; and the contents of the file contains serialized data to use as the value
; of the entry.
;apc.preload_path=
; The size of each shared memory segment, with M/G suffixe
;apc.shm_size=32M
; The number of seconds a cache entry is allowed to idle in a slot in case
; this cache entry slot is needed by another entry.
;apc.ttl=0
; The number of seconds that a cache entry may remain on the
; garbage-collection list.
;apc.gc_ttl=3600
; If you begin to get low on resources, an expunge of the cache
; is performed if it is less than half full. This is not always
; a suitable way of determining if an expunge of the cache
; should be per apc.smart allows you to set a runtime configuration
; value which is used to determine if an expunge should be run
; if (available_size < apc.smart * requested_size)
;apc.smart=0
; A "hint" about the number variables expected in the cache.
; Set to zero or omit if you are not sure;
;apc.entries_hint=4096
; The mktemp-style file_mask to pass to the mmap module
apc.mmap_file_mask=/tmp/apc.XXXXXX
; On very busy servers whenever you start the server or
; modify files you can create a race of many processes
; all trying to cache the same data at the same time.
; By default, APCu attempts to prevent "slamming" of a key.
; A key is considered "slammed" if it was the last key set,
; and a context other than the current one set it ( ie. it
; was set by another process or thread )
;apc.slam_defense=0
; Defines which serializer should be used
; Default is the standard PHP serializer.
;apc.serializer='php'
; use the SAPI request start time for TTL
;apc.use_request_time=0
; Enables APCu handling of signals, such as SIGSEGV, that write core files
; when signaled. APCu will attempt to unmap the shared memory segment in
; order to exclude it from the core file
;apc.coredump_unmap=0
PHP-FPM再起動
systemctl restart php-fpm
APCu動作状況確認
apc.phpを利用する
（krakjoe / apcu：https://github.com/krakjoe/apcu）