Re: New index structure with Open MP - Mailing list pgsql-general

From Tom Lane
Subject Re: New index structure with Open MP
Date
Msg-id 20319.1296423467@sss.pgh.pa.us
Whole thread Raw
In response to New index structure with Open MP  (Yves Weißig <weissig@rbg.informatik.tu-darmstadt.de>)
Responses Re: New index structure with Open MP  (Yves Weißig <weissig@rbg.informatik.tu-darmstadt.de>)
List pgsql-general
=?ISO-8859-15?Q?Yves_Wei=DFig?= <weissig@rbg.informatik.tu-darmstadt.de> writes:
> I am not aiming for full parallelization, only some
> parts of the algorithm regarding build, insert and search are going to
> be extended by Open MP. E.g. I want to parallelize searching in multiple
> pages by directing some portions to one thread and other portions to
> another thread. Do you think that this small amount of parallelization
> is possible? Or will there be complications with the used methods by the
> buffer manager and so on? What do you think? What are your thoughts?

The backend code is not designed for thread safety.  This is not a case
where "only a little bit" of parallelism is going to be safe.  It *will*
break.

            regards, tom lane

pgsql-general by date:

Previous
From: Yves Weißig
Date:
Subject: New index structure with Open MP
Next
From: Jerry LeVan
Date:
Subject: Re: iPad and Pg revisited...