Optimizing MySQL 5.6 for unit tests

We have a MySQL instance for unit tests. Our unit tests work very heavily on MySQL. Therefore, we put /var/lib/mysql dir in tmpfs file system because we don't need persistent data in unit tests. Our performance peaked when we did this; however, I would like to consult with you what's the best configuration for MySQL in this case. It's very common to put MySQL in tmpfs (memory) and run non-important stuff like unit tests. The question is: What's best configuration for InnoDB to run in tmpfs? These are the configs we have in my.cnf: max_connections=350 innodb_fast_shutdown=2 innodb_log_file_size=1048576 innodb_doublewrite=0 innodb_flush_method=O_DIRECT All our databases are in InnoDB. We don't mind losing some of the data. P.S. You might ask at this point, why not MEMORY engine? That's because MEMORY has table-level locking only, and part of our unit tests are based on this. EDIT: We've finished this project, we based our configuration from this blogpost: http://jotschi.de/2014/02/03/high-performance-mysql-testdatabase/