Re: Scaling shared buffer eviction

On 10/02/2014 05:40 PM, Robert Haas wrote:
> On Thu, Oct 2, 2014 at 10:36 AM, Andres Freund <andres@2ndquadrant.com> wrote:
>>> OK.
>>
>> Given that the results look good, do you plan to push this?
>
> By "this", you mean the increase in the number of buffer mapping
> partitions to 128, and a corresponding increase in MAX_SIMUL_LWLOCKS?

Hmm, do we actually ever need to hold all the buffer partition locks at 
the same time? At a quick search for NUM_BUFFER_PARTITIONS in the code, 
I couldn't find any place where we'd do that. I bumped up 
NUM_BUFFER_PARTITIONS to 128, but left MAX_SIMUL_LWLOCKS at 100, and did 
"make check". It passed.

- Heikki