From: | Atri Sharma <atri(dot)jiit(at)gmail(dot)com> |
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To: | Tomas Vondra <tv(at)fuzzy(dot)cz> |
Cc: | Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: custom hash-based COUNT(DISTINCT) aggregate - unexpectedly high memory consumption |
Date: | 2013-10-08 11:52:44 |
Message-ID: | CAOeZVicivJ6TDdczEyXYaCzwrQN9mtX16JDOsGgbMKu+xR2fFQ@mail.gmail.com |
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Lists: | pgsql-hackers |
On Tue, Oct 8, 2013 at 4:15 PM, Tomas Vondra <tv(at)fuzzy(dot)cz> wrote:
> On 8 Říjen 2013, 11:42, Atri Sharma wrote:
>>>
>>> I've made some significant improvements in the chaining version (in the
>>> master branch), now getting about the memory consumption I've estimated.
>>>
>> I agree, we can hope to reduce the memory consumption by making changes in
>> the current chaining implementation. I would like to look into changing
>> the data structure used for chaining from singly linked list to maybe skip
>> list or something else.
>
> Just to be sure - I haven't been messing with the HashAggregate
> implementation directly, but with a custom aggregate. But feel free to
> tweak the built-in hash table ;-)
>
> Tomas
>
Heh.
Do you mind if I try it out on the custom agg you built? I assume it
is on the github repo link you shared?
Regards,
Atri
--
Regards,
Atri
l'apprenant
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