Re: hash index improving v3

Alex Hunsaker napsal(a):
> On Wed, Sep 10, 2008 at 10:27 AM, Alex Hunsaker <badalex@gmail.com> wrote:
>> On Wed, Sep 10, 2008 at 8:47 AM, Zdenek Kotala <Zdenek.Kotala@sun.com> wrote:
>>> What locale did you use? It would be nice to have also comparing between C
>>> and any UTF8 locale. I think we should see big benefit when non C locale is
>>> used.
>> Err yes this was UTF8, Ill see about doing a C locale.
>>
>
> And here it with a C locale:
>
> pgbench -c1 -n -t100000 -f bench.sql
> cvs head: tps = 5142.784262
> v5:           tps = 6169.405965


If I look on both results

        C    UTF8    difference
-----------------------------------
cvs head:    5140    5050    -2%
v5:        6170    5750    -7%
improvement:    20%    14%

than I little bit wonder. I personally expected bigger difference of UTF8
comparing between CVS a v5. This test also shows that locale selection has
bigger impact on performance in v5 case, but result is still better than cvs head.

        Zdenek



--
Zdenek Kotala              Sun Microsystems
Prague, Czech Republic     http://sun.com/postgresql