On Wed, Oct 20, 2010 at 7:10 AM, Tom Lane <t...@sss.pgh.pa.us> wrote: > I believe that for the equivalent Solaris option, we just automatically > enable it when available. So there'd be no need for user documentation. > However, I definitely *would* like to see some benchmarks proving that > the change actually does something useful. I've always harbored the > suspicion that this is just a knob to satisfy people who need knobs to > frob.
Well saving a few megabytes of kernel space memory isn't a bad thing. But I think the major effect is on forking new processes. Having to copy that page map is a major cost when you're talking about very large memory footprints. While machine memory has gotten larger the 4k page size hasn't. I don't think it's a big cost once all the processes have been forked if you're reusing them beyond perhaps slightly more efficient cache usage. -- greg -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
