MariaDB 10.1 not only contains tons of new features, it has also been polished to deliver top performance. The biggest improvement has been achieved for scalability on massively multithreaded hardware.
The following numbers show the throughput for a simplified sysbench OLTP benchmark on MariaDB-10.1.8 compared to MariaDB-10.0.21:
The benchmark is sysbench-mariadb (sysbench trunk with a fix for a more scalable random number generator) OLTP simplified to do 1000 point selects per transaction. The data set is 1 million rows in 20 tables. Fewer tables can be used, but below 4 tables the performance drops somewhat due to a hot spot in the table definition cache.
This is the my.cnf used for this test:
max_connections = 400
table_open_cache = 800
query_cache_type = 0
innodb_buffer_pool_size = 512M
innodb_buffer_pool_instances = 10
innodb_adaptive_hash_index_partitions = 20
And this the sysbench command line:
sysbench-mariadb --test=lua/oltp.lua --oltp-tables-count=20
--oltp-table-size=50000 --num-threads=... --oltp-read-only=on
--oltp-simple-ranges=0 --oltp-sum-ranges=0 --oltp-order-ranges=0
--max-time=100 --max-requests=0 run
The benchmark was run on an IBM “Firestone” S822LC Power8 server with 2 sockets, 20 cores and 8-way SMT (160 hardware threads). The machine runs PowerKVM 3.1 and inside KVM an Ubuntu 14.04.3 LTS (ppc64le) guest. MariaDB-10.1.8 and sysbench-mariadb were compiled locally with IBM’s Advance Tool Chain 8.0 compiler.
The changes in the MariaDB source code leading to those impressive performance improvements are part of porting MariaDB to Power8. Some of the major changes shall be listed here:
MDEV-6089 MySQL WL#7305 “Improve MDL scalability by using lock-free hash”
MDEV-7004 Merge scalability fixes from 10.0-power
MDEV-7324 Lock-free hash for table definition cache
IBM has published a number of white papers on MariaDB and how it performs on Power8 compared to Intel hardware.