Re: Fwd: Bug#390730: postgresql-8.1: segfaults on huge

Le samedi 07 octobre 2006 à 12:23 -0400, Tom Lane a écrit :
> Martin Pitt <mpitt@debian.org> writes:
> > I recently got the Debian bug report below, a server crash with huge
> > IN clauses.
>
> What this sounds like to me is someone increasing max_stack_depth
> without understanding what he's doing.  You must make sure that
> max_stack_depth is less than the "ulimit -s" setting the postmaster
> is running under ... and not just a little bit less, you want a megabyte
> or so of daylight in there.

i used ulimit -s 8192 from the start ... and that's my mistake. So
you're right, i've misread the documentation, especially that part :

>  Per the documentation:
>
> max_stack_depth (integer)
>
> less a safety margin of a megabyte or so.

may be this point should be emphazised in the documentation. Is 1MB of
margin really enough ? the doc should be clearer.

> So if the OP wants to use huge IN clauses, he has to both increase
> max_stack_depth and adjust the ulimit that the postmaster runs under.

In order to run my application, i had to raise postgres stack size up to
20MB. I feel like hammering the stack that hard is quite hazardous.

But after all, everything works fine :) Thank you for you help.
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