| From: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
|---|---|
| To: | Bruce Momjian <bruce(at)momjian(dot)us> |
| Cc: | James Sewell <james(dot)sewell(at)lisasoft(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Random note of encouragement |
| Date: | 2016-02-24 23:50:06 |
| Message-ID: | CAEepm=3DPphFKDvqoEDXorM7uKvKOd_SbA_fGkSf5EserXGg3A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, Feb 25, 2016 at 12:26 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> On Thu, Feb 25, 2016 at 10:06:34AM +1100, James Sewell wrote:
>> Now when I run the following SQL (multiple times to allow for getting
>> everything into shared buffers, which is 4GB on my machine):
>>
>>
>> select sum(count_n) from base group by view_time_day;
>>
>>
>> I get the following results:
>>
>>
>> PSQL 9.5 - ~21 seconds
>> PSQL 9.6 devel - ~8.5 seconds
>>
>>
>> I think that's pretty good!
>>
>> I know this is a devel release, things may change, blah blah. But still,
>> something has changed for the better here!
>
> Wow, that is cool. Can anyone suggest which commit improved this?
Since it sums numerics, maybe integer transition functions from commit
959277a4f579da5243968c750069570a58e92b38 helped?
--
Thomas Munro
http://www.enterprisedb.com
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