Pretty straightforward question.
I use InnoDB for everything else, for a couple of reasons. Is it a performance hit over MyISAM for a 'high-traffic' table?
Since you're looking at a pretty even mix of read/write traffic, InnoDB is the better choice. MyISAM's full-table locks on every write would probably be murder. MyISAM fairs better with 90%+ read or 90%+ write situations.
I believe that's mentioned in High Performance MySQL
来源：https://stackoverflow.com/questions/3359403/which-mysql-database-engine-is-better-for-storing-sessions-and-session-data-myi