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Memcache Configuration Options

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Memcache Configuration OptionsNameDefaultChangeableChangelogmemcache.allow_failover"1"INI_ALLAvailable since memcache 2.0.2.memcache.max_failover_attempts"20"INI_ALLAvailable since memcache 2.1.0.memcache.chunk_size"8192"INI_ALLAvailable since memcache 2.0.2.memcache.default_port"11211"INI_ALLAvailable since memcache 2.0.2.memcache.hash_strategy"standard"INI_ALLAvailable since memcache 2.2.0.memcache.hash_function"crc32"INI_ALLAvailable since memcache 2.2.0.memcache.protocolasciiINI_ALLSupported since memcache 3.0.0memcache.redundancy1INI_ALLSupported since memcache 3.0.0memcache.session_redundancy2INI_ALLSupported since memcache 3.0.0memcache.compress_threshold20000INI_ALLSupported since memcache 3.0.3memcache.lock_timeout15INI_ALLSupported since memcache 3.0.4Session Configuration Options Affecting Memcache BehaviorNameDefaultChangeableChangelogsession.save_handler"files"INI_ALLSupported since memcache 2.1.2session.save_path""INI_ALLSupported since memcache 2.1.2 Constants

Runtime Runtime

Name	Default	Changeable	Changelog
memcache.allow_failover	"1"	`INI_ALL`	Available since memcache 2.0.2.
memcache.max_failover_attempts	"20"	`INI_ALL`	Available since memcache 2.1.0.
memcache.chunk_size	"8192"	`INI_ALL`	Available since memcache 2.0.2.
memcache.default_port	"11211"	`INI_ALL`	Available since memcache 2.0.2.
memcache.hash_strategy	"standard"	`INI_ALL`	Available since memcache 2.2.0.
memcache.hash_function	"crc32"	`INI_ALL`	Available since memcache 2.2.0.
memcache.protocol	ascii	`INI_ALL`	Supported since memcache 3.0.0
memcache.redundancy	1	`INI_ALL`	Supported since memcache 3.0.0
memcache.session_redundancy	2	`INI_ALL`	Supported since memcache 3.0.0
memcache.compress_threshold	20000	`INI_ALL`	Supported since memcache 3.0.3
memcache.lock_timeout	15	`INI_ALL`	Supported since memcache 3.0.4

Name	Default	Changeable	Changelog
session.save_handler	"files"	`INI_ALL`	Supported since memcache 2.1.2
session.save_path	""	`INI_ALL`	Supported since memcache 2.1.2

Constants

Title

memcache.allow_failoverbool

Whether to transparently failover to other servers on errors.

memcache.max_failover_attemptsint

Defines how many servers to try when setting and getting data. Used only in conjunction with memcache.allow_failover.

memcache.chunk_sizeint

Data will be transferred in chunks of this size, setting the value lower requires more network writes. Try increasing this value to 32768 if noticing otherwise inexplicable slowdowns.

memcache.default_portstring

The default TCP port number to use when connecting to the memcached server if no other port is specified.

memcache.hash_strategystring

Controls which strategy to use when mapping keys to servers. Set this value to consistent to enable consistent hashing which allows servers to be added or removed from the pool without causing keys to be remapped. Setting this value to standard results in the old strategy being used.

memcache.hash_functionstring

Controls which hash function to apply when mapping keys to servers, crc32 uses the standard CRC32 hash while fnv uses FNV-1a.

memcache.protocolstring

memcache.redundancyint

memcache.session_redundancyint

memcache.compress_thresholdint

memcache.lock_timeoutint

session.save_handlerstring

Use memcache as a session handler by setting this value to memcache.

session.save_pathstring

Defines a comma separated of server urls to use for session storage, for example "tcp://host1:11211, tcp://host2:11211".

Each url may contain parameters which are applied to that server, they are the same as for the Memcache::addServer() method. For example "tcp://host1:11211?persistent=1&weight=1&timeout=1&retry_interval=15"

Source: reference/memcache/ini.xml · from the official PHP manual (php/doc-en)