Re: [PATCH] PostgreSQL 9.4 mmap(2) performance regression on FreeBSD... - Mailing list pgsql-hackers

From Bruce Momjian
Subject Re: [PATCH] PostgreSQL 9.4 mmap(2) performance regression on FreeBSD...
Date
Msg-id 20150322020639.GF10795@momjian.us
Whole thread Raw
In response to Re: [PATCH] PostgreSQL 9.4 mmap(2) performance regression on FreeBSD...  (Bruce Momjian <bruce@momjian.us>)
List pgsql-hackers
On Thu, Mar 19, 2015 at 12:16:07PM -0400, Bruce Momjian wrote:
> On Mon, Oct 13, 2014 at 11:35:18AM -0400, Bruce Momjian wrote:
> > On Mon, Oct 13, 2014 at 05:21:32PM +0200, Andres Freund wrote:
> > > > If we have it, we should improve it, or remove it.  We might want to use
> > > > this code for something else in the future, so it should be improved
> > > > where feasible.
> > > 
> > > Meh. We don't put in effort into code that doesn't matter just because
> > > it might get used elsewhere some day. By that argument we'd need to
> > > performance optimize a lot of code. And actually, using that code
> > > somewhere else is more of a counter indication than a pro
> > > argument. MAP_NOSYNC isn't a general purpose flag.
> > 
> > The key is that this is platform-specific behavior, so if we should use
> > a flag to use it right, we should.  You are right that optimizing
> > rarely used code with generic calls isn't a good use of time.
> 
> I have adjusted Sean's mmap() options patch to match our C layout and
> plan to apply this to head, as it is from August.

Patch applied.

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + Everyone has their own god. +



pgsql-hackers by date:

Previous
From: Alvaro Herrera
Date:
Subject: Re: PATCH: numeric timestamp in log_line_prefix
Next
From: Bruce Momjian
Date:
Subject: Re: No toast table for pg_shseclabel but for pg_seclabel