From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
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To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
Cc: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: can we publish a aset interface? |
Date: | 2010-09-07 15:18:27 |
Message-ID: | 1283872651-sup-9737@alvh.no-ip.org |
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Lists: | pgsql-hackers |
Excerpts from Robert Haas's message of mar sep 07 10:13:12 -0400 2010:
> > I try to solve performance problems with czech tsearch. I checked
> > serialization and deserialization, but this decrease load time only to
> > 100ms (from 500) that is too much for us. After some gaming with mmap
> > I thinking so there some chance to preallocate mmap memory, and then
> > use a special memory context based on mmap instead of malloc.
> > Teoretically I can copy aset interface - this module probably never be
> > in core (this problem is probably local - only Czech), but it isn't
> > nice. So I asking.
>
> I don't see how you could do anything with this that you can't do with
> the existing implementation. It's not as if you can store pointers
> into an mmap'd block and then count on them being valid the next time
> you map the file... it might not end up at the same offset.
Hmm, surely you could store offsets instead of absolute pointers.
--
Álvaro Herrera <alvherre(at)commandprompt(dot)com>
The PostgreSQL Company - Command Prompt, Inc.
PostgreSQL Replication, Consulting, Custom Development, 24x7 support
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