bug#43850: cuirass: inconsistent SQL queries execution time.

[Mathieu Othacehe]

Hello,

> this should improve the situation, even if I still observe some
> inconsistent execution duration.

I tried to use the two following pragma:

--8<---------------cut here---------------start------------->8---
PRAGMA synchronous = OFF
PRAGMA mmap_size = 10737418240
--8<---------------cut here---------------end--------------->8---

hoping that mmaping the Cuirass database and disabling synchronisation
would help, but there were still inconsistent duration.

I have now copied the database to a tmpfs mounted directory to make sure
that those inconsistent duration are only caused by the I/O pressure on
berlin.

Thanks,

Mathieu