On 2016-10-12 16:33:38 -0400, Tom Lane wrote: > Andres Freund <and...@anarazel.de> writes: > > On October 12, 2016 1:25:54 PM PDT, Tom Lane <t...@sss.pgh.pa.us> wrote: > >> A little bit of research suggests that on Linux the thing to do would > >> be to get the actual default hugepage size by reading /proc/meminfo and > >> looking for a line like "Hugepagesize: 2048 kB". > > > We had that, but Heikki ripped it out when merging... I think you're > > supposed to use /sys to get the available size. > > According to > https://www.kernel.org/doc/Documentation/vm/hugetlbpage.txt > looking into /proc/meminfo is the longer-standing API and thus is > likely to work on more kernel versions.
MAP_HUGETLB, which we rely on for hugepage support, is newer than the introducing the /sys stuff. > Also, if you look into /sys then you are going to see multiple > possible values and it's not clear how to choose the right one. That's a fair point. It'd probably be good to use the largest we can, bounded by a percentage of max waste or such. But that's likely something for another day. Regards, Andres -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers