Hi,
On 2018-04-30 15:39:08 +0500, Andrey Borodin wrote:
> I suspect that performance benefits can be not that big or even
> marginal, if we do not extend comprehensive eviction strategy with
> bgwriter fixes and O_DIRECT.
If so, then the improvements aren't real. Bgwriter doesn't matter for
read-only workloads. O_DIRECT doesn't matter much if shared_buffers are
60+% of OS memory. And even disregarding that, you can just compute
cache hit ratios to see whether things are improving.
Greetings,
Andres Freund