Please ignore my posts. Log is quite expensive an operation... On Mon, May 11, 2009 at 11:45 AM, Guangwei Yuan <guy...@gmail.com> wrote:
> After spending more time on this, it seems more likely a problem from > FunctionQuery. If using boost = log(100) takes 100ms, log(log(100)) adds > another 100ms, log(log(log(100))) adds another 100ms, and so on. The time > goes up almost linearly instead of being constant. Any ideas? > > Thanks, > > Guangwei > > > On Sat, May 9, 2009 at 12:31 PM, Guangwei Yuan <guy...@gmail.com> wrote: > >> Hi, >> >> I'm trying the BoostQParserPlugin and FunctionQuery to enable query time >> boosting. It works better than bf (boost function) because it multiplies >> the relevancy score by the boosts. However I noticed significant >> performance issues with it. The more functions I use as boosts, the slower >> it gets. For example, if a query without boosts takes 300ms, adding a boost >> function like log(popularity) becomes 600ms, using pow(log(popularity),2) >> takes 800ms, using >> product(pow(log(score_total),2),recip(rord(days),1,90,90)) takes 1100ms. >> Ideally I'd like to pass in a reasonable amount of functions to adjust the >> search ranking dynamically without sacrificing much performance. >> >> Thanks, >> >> Guangwei >> > >
