From: Scott Marlowe <smarlowe@g2switchworks.com>
To: Mohan, Ross <RMohan@arbinet.com>
Cc: pgsql-general@postgresql.org
Subject: Re: [PERFORM] Projecting currentdb to more users
Date: Tue, 12 Jul 2005 13:41:14 -0500
Message-ID: <1121193674.8208.236.camel@state.g2switchworks.com> (raw)
In-Reply-To: <CC74E7E10A8A054798B6611BD1FEF4D307966FF5@vamail01.thexchange.com>
References: <CC74E7E10A8A054798B6611BD1FEF4D307966FF5@vamail01.thexchange.com>
On Tue, 2005-07-12 at 13:24, Mohan, Ross wrote:
> From AMD's suit against Intel. Perhaps relevant to some PG/AMD issues.
>
> "...125. Intel has designed its compiler purposely to degrade performance when a program
> is run on an AMD platform. To achieve this, Intel designed the compiler to compile code
> along several alternate code paths. Some paths are executed when the program runs on an Intel
> platform and others are executed when the program is operated on a computer with an AMD
> microprocessor. (The choice of code path is determined when the program is started, using a
> feature known as "CPUID" which identifies the computer's microprocessor.) By design, the
> code paths were not created equally. If the program detects a "Genuine Intel" microprocessor,
> it executes a fully optimized code path and operates with the maximum efficiency. However,
> if the program detects an "Authentic AMD" microprocessor, it executes a different code path
> that will degrade the program's performance or cause it to crash..."
Well, this is, right now, just AMD's supposition about Intel's
behaviour, I'm not sure one way or the other if Intel IS doing this.
Being a big, money hungry company, I wouldn't be surprised if they are,
but I don't think it would affect postgresql for most people, since they
would be using the gcc compiler.
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: smarlowe@g2switchworks.com, RMohan@arbinet.com, pgsql-general@postgresql.org
Subject: Re: [PERFORM] Projecting currentdb to more users
In-Reply-To: <1121193674.8208.236.camel@state.g2switchworks.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox