engine-params.org

EP Parameters

1 Configuring the Engine

Engine parameters may be specified using the -e option to memcached. These parameters control various aspects of the behavior of the engine.

For example, if you would like to store your database in /data/base and prevent it from having objects larger than 1MB, you would run memcached like this:

memcached -E ep.so -e 'dbfile=/data/base;max_size=1048576'

2 Parameters for the EP Engine

key	type	descr
config_file	string	Path to additional parameters.
dbname	string	Path to on-disk storage.
ht_locks	int	Number of locks per hash table.
ht_size	int	Number of buckets per hash table.
initfile	string	Optional SQL script to run after opening DB
max_item_size	int	Maximum number of bytes allowed for an item.
max_size	int	Max cumulative item size in bytes.
mem_high_wat	int	Automatically evict when exceeding this size.
mem_low_wat	int	Low water mark to aim for when evicting.
min_data_age	int	Minimum data stability time before persist.
queue_age_cap	int	Maximum queue time before forcing persist.
tap_id	string	Local tap identifier for remote peer.
tap_idle_timeout	int	Tap client idle timeout.
tap_keepalive	int	Seconds to hold open named tap connections.
tap_peer	string	Upstream server to contact.
vb0	bool	If true, start with an active vbucket 0
waitforwarmup	bool	Whether to block server start during warmup.
warmup	bool	Whether to load existing data at startup.