Re: regex cache

Tom Lane wrote:
> Josh Berkus <josh@agliodbs.com> writes:
>>> Having said that, I'm not sure it'd help your problem.  If your query is
>>> using more than 32 regexes concurrently, it likely is using $BIGNUM
>>> regexes concurrently.  How do we fix that?
> 
>> Hmmm.  I think there's a lot of ground between 32 and $BIGNUM.  For example, 
>> where I'm hitting a wall is 300 regexes.  Some quick testing on my opteron 
>> text machine right now shows that the execution time difference between 20rx 
>> and 50rx is around 20x.
> 
> Hmm.  Well, I still don't want to tie it to work_mem; how do you feel
> about a new GUC to determine the max number of cached REs?

Yeah.  You know me, I was just trying to avoid having more GUCs.

--Josh