mysql database
http://sysbench.sourceforge.net
sysbench --test=oltp
200,000 requests on 2,000,000 rows table.
| total time | per-request stat (ms) |
| (seconds) | min | avg | max |
-----------------+------------+-------+-------+-------+
baremetal | 208.6237 | 2.5 | 16.7 | 942.6 |
-----------------+------------+-------+-------+-------+
cache=on | 642.2962 | 2.5 | 51.4 | 326.9 |
-----------------+------------+-------+-------+-------+
cache=on,O_DSYNC | 646.6570 | 2.7 | 51.7 | 347.0 |
-----------------+------------+-------+-------+-------+
cache=off | 635.4424 | 2.9 | 50.8 | 399.5 |
-----------------+------------+-------+-------+-------+