Re: dynamic shared memory: wherein I am punished for good intentions

* Robert Haas (robertmhaas(at)gmail(dot)com) wrote:
> On Thu, Oct 10, 2013 at 2:36 PM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
> > On Thu, Oct 10, 2013 at 9:13 AM, Robert Haas <robertmhaas(at)gmail(dot)com> wrote:
> >> (2) Default to using System V shared memory. If people want POSIX
> >> shared memory, let them change the default.
> >
> >> After some consideration, I think my vote is for option #2.
> >
> > Wouldn't that become the call of packagers?
>
> Packagers can certainly override whatever we do, but we still need to
> make the buildfarm green again.

While I agree that making the buildfarm green is valuable, I really
wonder about a system where /dev/shm is busted.

Personally, I like Andrew's suggestion to test and set accordingly, with
the default being POSIX if it's available and a fall-back to SysV (maybe
with a warning..). Going back to the situation where our default set-up
limits us to the ridiculously small SysV value would *really* suck; even
if we don't have any users today, we're certainly going to have some
soon and I don't think they'll be happy with a 24MB (or whatever) limit.

Thanks,

Stephen