Comments - myisam_use_mmap does not use mmap after a massive insert
Content reproduced on this site is the property of its respective owners,
and this content is not reviewed in advance by MariaDB. The views, information and opinions
expressed by this content do not necessarily represent those of MariaDB or any other party.
For example, this could be found here: http://www.mysqlperformanceblog.com/2006/05/26/myisam-mmap-feature-51/
You're right.
I couldn't find this in the manual, but I see it in the source code.
It looks like a bug then. I'd suggest you to submit a bug report at http://bugs.mysql.com (and mention that this behavior is not documented - which is a second, documentation, bug).
I'm sure this bug applies to MariaDB as well, still we really prefer bugs to be fixed upstream. But if you'll get no reaction from Oracle in a reasonable time frame, feel free to resubmit the bug at https://bugs.launchpad.net/maria/ (and quote MySQL's bug number there please).