Allow disabling off-heap messages
Off-heap messages is an Erlang 19 feature:
http://erlang.org/doc/man/erlang.html#process_flag_message_queue_data
It is adviseable to use that setting for processes which expect to receive a
lot of messages. CouchDB sets it for couch_server, couch_log_server and bunch
of others as well.
In some cases the off-heap behavior could alter the timing of message receives
and expose subtle bugs that have been lurking in the code for years. Or could
slightly reduce performance, so a safety measure allow disabling it.
6 files changed
