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mlock
Memory locking for cached data. Optional, default is 0 (do not call mlock()).
For search performance, searchd preloads
a copy of .spa and .spi
files in RAM, and keeps that copy in RAM at all times. But if there
are no searches on the index for some time, there are no accesses
to that cached copy, and OS might decide to swap it out to disk.
First queries to such “cooled down” index will cause swap-in
and their latency will suffer.
Setting mlock option to 1 makes Sphinx lock physical RAM used
for that cached data using mlock(2) system call, and that prevents
swapping (see man 2 mlock for details). mlock(2) is a privileged call,
so it will require searchd to be either run
from root account, or be granted enough privileges otherwise.
If mlock() fails, a warning is emitted, but index continues
working.
Example:
mlock = 1
