Re: WIP: Fast GiST index build

On 26.08.2011 17:18, Alexander Korotkov wrote:
> On Thu, Aug 25, 2011 at 11:08 PM, Heikki Linnakangas<
> heikki(dot)linnakangas(at)enterprisedb(dot)com> wrote:
>
>> Could you share the test scripts, patches and data sets etc. needed to
>> reproduce the tests you've been running? I'd like to try them out on a test
>> server.
>>
>
> 1) I've updated links to the datasets on the wiki page.
> 2) Script for index quality testing fastbuild_test.php is in the attachment.
> In order to run it you need PHP with pdo and pdo_pgsql modules. Also
> plantuner moduler is required (it is used to force planer to use specific
> index). After running that script following query returns relative score of
> index quality:
>
> select indexname, avg(count::real/(select count from test_result a2 where
> a2.indexname = 'usnoa2_idx3' and a2.predicate = a1.predicate and
> a2.tablename = a1.tablename)::real) from test_result a1 where a1.tablename =
> 'usnoa2' group by indexname;
>
> where 'usnoa2' - table name, 'usnoa2_idx3' - name of index which quality was
> assumed to be 1.
> 3) Patch which makes plantuner work with HEAD is also in attachment.
> 4) Patch with my split algorithm implementation is attached. Now it's form
> is appropriate only for testing purposes.
> 5) For indexes creation I use simple script which is attached as
> 'indexes.sql'. Also, similar script with different index names I'm running
> with my split patch.
>
> Feel free to ask questions about all this stuff.

Thanks! Meanwhile, I hacked together a script of my own to do
performance testing. I let it run over the weekend, but I just realized
that I forgot to vacuum the test tables so the results are not worth
much. I'm rerunning them now, stay tuned!

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com