Peter Eisentraut <peter_e@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?
regards, tom lane