| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Noah Misch <noah(at)leadboat(dot)com>, Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Re: patch: fix performance problems with repated decomprimation of varlena values in plpgsql |
| Date: | 2011-01-28 19:19:36 |
| Message-ID: | AANLkTikj2J1YneFirPACZ6ZZh02sc61hrU6PLppW1FQw@mail.gmail.com |
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| Lists: | pgsql-hackers |
2011/1/28 Robert Haas <robertmhaas(at)gmail(dot)com>:
> On Tue, Jan 25, 2011 at 11:29 AM, Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> wrote:
>> variant a) my first patch - detoast on first usage with avoiding to
>> useless detoast checking
>> variant b) my first patch - detoast on first usage without avoiding to
>> useless detoast checking
>>
>> time for 1 - about 300 ms, a is bout 1.5% faster than b
>> time for 2 - about 30000 ms, a is about 3% faster than b
>
> This makes your approach sound pretty good, but it sounds like we
> might need to find a better way to structure the code.
>
do you have a any idea?
Pavel
> --
> Robert Haas
> EnterpriseDB: http://www.enterprisedb.com
> The Enterprise PostgreSQL Company
>
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