On tis, 2010-11-30 at 15:49 -0500, Tom Lane wrote: > Peter Eisentraut <pete...@gmx.net> writes: > > On mån, 2010-11-29 at 13:10 -0500, Tom Lane wrote: > >> Rolling in calloc in place of > >> malloc/memset made no particular difference either, which says that > >> Fedora 13's glibc does not have any optimization for that case as I'd > >> hoped. > > > glibc's calloc is either mmap of /dev/zero or malloc followed by memset. > > Hmm. I would have expected to see a difference then. Do you know what > conditions are needed to cause the mmap to be used?
Check out the mallopt(3) man page. It contains a few tunable malloc options that may be useful for your investigation. -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
