On Wed, Apr 4, 2012 at 6:25 PM, Alvaro Herrera <alvhe...@commandprompt.com> wrote: > > Excerpts from Greg Stark's message of mié abr 04 14:11:29 -0300 2012: >> On Wed, Apr 4, 2012 at 1:00 PM, Robert Haas <robertmh...@gmail.com> wrote: >> > , everybody's next few CLOG requests hit some other >> > buffer but eventually the long-I/O-in-progress buffer again becomes >> > least recently used and the next CLOG eviction causes a second backend >> > to begin waiting for that buffer. >> >> This still sounds like evidence that the slru is just too small for >> this transaction rate. > > What this statement means to me is that the number of slru buffers > should be configurable, not compile-time fixed.
I think the compile time fixed allows it to be loop unrolled and executed in parallel. Using a parameter makes the lookups slower. Worth testing. Life changes. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
