Re: [COMMITTERS] pgsql: Remove O(N^2) performance issue with multiple SAVEPOINTs.
От
Simon Riggs
Тема
Re: [COMMITTERS] pgsql: Remove O(N^2) performance issue with multiple SAVEPOINTs.
Дата
Msg-id
CA+U5nMLsw0FfGVAHzqa-e=L1XEy=_7tttXikLft1rb2wZ7Za+Q@mail.gmail.com
Ответ на
Re: [COMMITTERS] pgsql: Remove O(N^2) performance issue with multiple
SAVEPOINTs. (Heikki Linnakangas)
Список
Дерево обсуждения
Re: Re: [COMMITTERS] pgsql: Remove O(N^2) performance issue with multiple SAVEPOINTs. Alvaro Herrera <alvherre@commandprompt.com>
Re: Re: [COMMITTERS] pgsql: Remove O(N^2) performance issue
with multiple SAVEPOINTs. Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
On Tue, Jul 19, 2011 at 9:24 PM, Heikki Linnakangas wrote: >> You might persuade me to do it another way, but I can't see how to >> make that way work. Your case seems a stretch. > > You get coincidences with memory allocations surprisingly often, because > things tend to get allocated and free'd in chunks of certain sizes. It's > also pretty fragile in the face of future development. It's not hard to > imagine someone adding code in lock.c to dereference the pointer. Then I think we need a 4th phase (would actually happen first). I will revoke and rework. -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services
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