[Xapian-discuss] ADJ Performance

[程诚]

Thanks for your attention.
I will try it.


2012/9/14 Olly Betts <olly at survex.com>

> On Mon, Sep 10, 2012 at 11:30:45PM +0100, Olly Betts wrote:
> > On Mon, Sep 10, 2012 at 02:16:59PM +0800, ???? wrote:
> > > Xapian:1.2.5
> > >
> > > About 2.3GB of database files and 250,000 documents.
> > >
> > > When I use ADJ mode just like "how ADJ/1 much", It cost about 15s. So
> my
> > > question is how to improve performance.
> >
> > This is essentially the issue which ticket 394 is about:
> >
> > http://trac.xapian.org/ticket/394
> >
> > The patch there only addresses exact ordered phrases, so will help ADJ/1
> > but not ADJ/2 or more, or NEAR, but the same idea will work for other
> > queries which use positional information.
> >
> > Coincidentally, I'm currently working on tidying up this patch and
> > getting it merged to trunk.
>
> While working on this, I noticed a simpler optimisation, which is more
> widely applicable (though probably not as effective).
>
> Could you try this patch and see how much difference it makes to your
> test case:
>
>
> http://trac.xapian.org/attachment/ticket/394/positional-query-weight-check-first-1.2.patch
>
> Cheers,
>     Olly
>