NOTE: this article I've started to write yet before summer
vacations, but timing was against me, and I'm able to finish and
publish it only now. While my investigations are continuing,
you'll find here the explanations why Vadim observed unexpected performance improvements when using
a single InnoDB BP instance rather 8, and some other things as well..
* * *
The InnoDB Buffer Pool (BP) Instances feature was introduced
since MySQL 5.5.4 and presented for the first time during MySQL
UC2010. This solution was the key point on its time, as without
BP instances no one from other newly added great features was
able to show any positive impact on performance (as otherwise all
the stuff was still …