Our company Postgres Professional has conducted a performance testing on big P8 server, provided by IBM. One excited thing is that we were able to identify scalability issue and made a patch (kludge for now), which gave us performance of postgres close to million tps. We'll discuss the approach used in patch in -hackers.
More details are in Alexander's Korotkov blog post.
http://www.postgrespro.ru/blog/pgsql/2015/08/30/p8scaling Next post we'll compare performance of postgres and MariaDB :)