Lukas Vogel

introduce sync calls for systems not doing fsync

1

Added sync around data loading for ClickHouse and Ursa as their load times are below the theoretical minimum for instances where the whole dataset fits into memory (cf Issue #678)...

Reported load times of some systems are impossibly low

9

Some systems report load times below the theoretical minimum. For example, [gp2 provides ~250MB/s throughput](https://docs.aws.amazon.com/ebs/latest/userguide/ebs-volume-types.html). With the smallest data size anyone reports being ~10 GB, any load time below 40...