Robert Haas <robertmhaas@gmail.com> writes:
> On Nov 24, 2010, at 4:05 PM, Andres Freund <andres@anarazel.de> wrote:
>> Yes, but only once. Also scrubbing a page is faster than copying it... (and
>> there were patches floating around to do that in advance, not sure if they got
>> integrated into mainline linux)
> I'm not following - can you elaborate?
I think Andres is saying that bss space isn't optimized during a fork
operation: it'll be propagated to the child as copy-on-write pages.
Dunno if that's true or not, but if it is, it'd be a good reason to
avoid the scheme you're suggesting.
regards, tom lane
