Re: Proposal : For Auto-Prewarm.

On Fri, Oct 28, 2016 at 3:40 AM, Andres Freund <andres@anarazel.de> wrote:
>>
>> There is not much common functionality between the two.
>
> I don't really agree. For me manual and automated prewarming are pretty
> closely related. Sure they have their independent usages, and not too
> much code might be shared. But grouping them in the same extension seems
> to make sense, it's confusing to have closely related but independent
> extensions.

I agree that putting them together would be fine.

>> One point that seems to be worth discussing is when should the buffer
>> information be dumped to a file?  Shall we dump at each checkpoint or
>> at regular intervals via auto prewarm worker or at some other time?
>
> Should probably be at some regular interval - not sure if checkpoints
> are the best time (or if it's even realistic to tie a bgworker to
> checkpoints), since checkpoints have a significant impact on the state
> of shared_buffers.

Checkpoints don't cause any buffer replacement, which I think is what
would be relevant here.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company