On Thu, Sep 25, 2014 at 10:14 AM, Andres Freund <andres@2ndquadrant.com> wrote:
> That leads me to wonder: Have you measured different, lower, number of
> buffer mapping locks? 128 locks is, if we'd as we should align them
> properly, 8KB of memory. Common L1 cache sizes are around 32k...
Amit has some results upthread showing 64 being good, but not as good
as 128. I haven't verified that myself, but have no reason to doubt
it.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
