Re: Custom GIST getting ERROR: too many LWLocks taken

On Sun, 20 Nov 2005, Ben Martin wrote:

> Hi,
> Perhaps this post is better suited to another PG mailing list? If this
> is the cast then apologies up front :/

pgsql-hackers is more appropriate list

>
> I've been playing around with improving some of the GiST code in PG
> 8.1 to better take advantage of domain knowledge where I am applying it.
> I am now getting "ERROR: too many LWLocks taken" when I create index on
> a largish table (about 50Mb index should be generated).
>
> I only get this when shuffling around some index tuples inside
> picksplit(). The pointers and left/right splits all seem to be in order
> when I return and the smaller indexes I've created using this code are
> all fine. My GiST is based on an existing implementation from PG 8.1 so
> the allocation of the pages etc should all be fine.
>
> Any hints as to what could be eating up LWLocks in this case?
>

looks like you're leaking locks. 100 locks is a maximum number of
simultaneous locks (backend/storage/lwlock.c).

> Thanks.
>
>
>

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
Sternberg Astronomical Institute, Moscow University (Russia)
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(095)939-16-83, +007(095)939-23-83