From: Tom Lane <tgl@sss.pgh.pa.us>
To: Oskari Saarenmaa <os@ohmu.fi>
cc: pgsql-hackers@postgresql.org
Subject: Re: Use pread and pwrite instead of lseek + write and read
In-reply-to: <a86bd200-ebbe-d829-e3ca-0c4474b2fcb7@ohmu.fi>
References: <a86bd200-ebbe-d829-e3ca-0c4474b2fcb7@ohmu.fi>
Comments: In-reply-to Oskari Saarenmaa <os@ohmu.fi>
	message dated "Wed, 17 Aug 2016 10:58:09 +0300"
Date: Wed, 17 Aug 2016 09:40:41 -0400
Message-ID: <7109.1471441241@sss.pgh.pa.us>
Precedence: bulk
Sender: pgsql-hackers-owner@postgresql.org

Oskari Saarenmaa <os@ohmu.fi> writes:
> On my laptop a simple pgbench run (scale 100, 15 minutes) shows a 1.5% 
> performance improvement.

I would have hoped for a lot better result before anyone would propose
that we should deal with all the portability issues this'll create.

> A 1.5% performance improvement is small but 
> measurable - and IMV more importantly it allows us to drop more than 100 
> lines of backwards (compatible?) code; maybe we could start targeting 
> more recent platforms in v10?

That's basically nonsense: we'll end up adding way more than that to
deal with platforms that haven't got these APIs.

			regards, tom lane


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