t’s been almost a year since I benchmarked MariaDB and mysql on our good old 4 CPU / 32 Cores / 64 Threads Sandy Bridge server. There seem to be a few interesting things happened since that time.
MySQL 5.6.23 peakthroughput dropped by ~8% compared to 5.6.14. Looks like this regression appeared in MySQL 5.6.21. 10.0.18 (git snapshot) peak threads increased by ~20% compared to 10.0.9 and reached parity with 5.6.23 (not with 5.6.20 though). 10.1.4 (git snapshot) and 5.7.5 are the champions (though 10.1.4 was usually 1-5% faster). Both have similar peaks @ 64 threads.They seem to be pushing this system limits, since both have capacity to scale more. 5.7.6 has serious (~50%) scalability regression compared to 5.7.5. There is heavy LOCK_plugin mutex contention, which seem to be caused by query rewrite plugin framework. I couldn’t find way to disable it. Hope this will be fixed in coming releases.
Raw data available at google doc.