| From: | Joshua Berkus <josh(at)agliodbs(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Subject: | Re: eviscerating the parser |
| Date: | 2011-05-22 17:38:01 |
| Message-ID: | 900868836.4146.1306085881747.JavaMail.root@mail-1.01.com |
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| Lists: | pgsql-hackers |
Robert,
> Another point is that parsing overhead is quite obviously not the
> reason for the massive performance gap between one core running simple
> selects on PostgreSQL and one core running simple selects on MySQL.
> Even if I had (further) eviscerated the parser to cover only the
> syntax those queries actually use, it wasn't going to buy more than a
> couple points.
I don't know if you say Jignesh's presentation, but there seems to be a lot of reason to believe that we are lock-bound on large numbers of concurrent read-only queries.
--
Josh Berkus
PostgreSQL Experts Inc.
http://pgexperts.com
San Francisco
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