History file flush period Option

The SMS gateway option specifies how frequently cached history data is periodically flushed to disk; i.e.,  the data is held solely in memory for no longer than   milliseconds. By default, a value of 100 milliseconds (0.1 second) is used. Note that data written to disk is typically kept cached in memory as well. The data is written to disk so as to not lose it across server restarts.

The default value is: 100

See also:
 * SMS gateway options