On Monday, October 29, 2012 09:33:25 PM Tom Lane wrote: > Christian Kruse <cjk+postg...@defunct.ch> writes: > > I created a patch which implements MAP_HUGETLB for sysv shared memory > > segments (PGSharedMemoryCreate). It is based on tests of Tom Lane and > > Andres Freund, I added error handling, huge page size detection and a > > GUC variable. > > My recollection is we'd decided not to pursue that because of fears that > it could make performance horribly worse on some platforms.
Hm. I don't so. Maybe youre remembering our discussion about mlock? MAP_HUGETLB is linux specific anyway, there are other OSes doing this, but I don't think a standard exists. http://archives.postgresql.org/message- id/201206292152.40311.andres%402ndquadrant.com and http://archives.postgresql.org/message- id/CA%2BTgmoZGX0Pi0rw5sDH0Uz%3D03WkQ%3DmnoAW3TXVEfvUpyW%2BfMjw%40mail.gmail.com seem to be the most recent discussions arround this. The parts I like most about having usable hugepages arround is usable 'ps' output and way smaller pagetables... Greetings, Andres -- Andres Freund 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
