Re: Re: Increasing work_mem and shared_buffers on Postgres 9.2 significantly slows down queries

Поиск
Список
Период
Сортировка
От Jeff Janes
Тема Re: Re: Increasing work_mem and shared_buffers on Postgres 9.2 significantly slows down queries
Дата
Msg-id CAMkU=1wkUvrJGSj7kJq3CqoSBmKr7qtAMsqEPEBCnggwv4Yn2A@mail.gmail.com
обсуждение исходный текст
Ответ на Re: Re: Increasing work_mem and shared_buffers on Postgres 9.2 significantly slows down queries  ("Gunnar \"Nick\" Bluth" <gunnar.bluth@pro-open.de>)
Ответы Re: Re: Increasing work_mem and shared_buffers on Postgres 9.2 significantly slows down queries  (Claudio Freire <klaussfreire@gmail.com>)
Список pgsql-performance
Дерево обсуждения 
On Sat, Nov 3, 2012 at 10:09 AM, Gunnar "Nick" Bluth
<gunnar.bluth@pro-open.de> wrote:

> Well, I'm pretty sure that having more work_mem is a good thing (tm)
> normally ;-)

In my experience when doing sorts in isolation, having more work_mem
is a bad thing, unless it enables you to remove a layer of
tape-merging.  I always blamed it on the L1/L2 etc. levels of caching.

Cheers,

Jeff

В списке pgsql-performance по дате отправления:

Предыдущее
От: Claudio Freire
Дата:
Сообщение: Re: dbt2 performance regresses from 9.1.6 to 9.2.1
Следующее
От: Claudio Freire
Дата:
Сообщение: Re: Re: Increasing work_mem and shared_buffers on Postgres 9.2 significantly slows down queries