On 09/05/2013 03:30 PM, Merlin Moncure wrote:
>> Standard advice we've given in the past is 25% shared buffers, 75%
>> effective_cache_size. Which would make EFS *3X* shared_buffers, not 4X.
>> Maybe we're changing the conventional calculation, but I thought I'd
>> point that out.
>
> This was debated upthread.
Actually, no, it wasn't. Tom threw out a suggestion that we use 4X for
historical reasons. That's all, there was no discussion.
So, my point stands: our historical advice has been to set EFS to 75% of
RAM. Maybe we're changing that advice, but if so, let's change it.
Otherwise 3X makes more sense.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com