[Xapian-discuss] ADJ Performance

[Olly Betts]

On Mon, Sep 10, 2012 at 02:16:59PM +0800, ???? wrote:
> ADJ matches if the words appear in the same order as in the query. Now I
> focus on the performance.
> 
> Test case
> 
> 2 * T7200 at 2.00GHz
> 3.0GB
> 
> 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.

Cheers,
    Olly