[gmx-users] Re: itanium2 vs xeon

Erik Lindahl lindahl at csb.stanford.edu
Wed Feb 25 18:53:00 CET 2004


I'm working on backporting the whole module of new optimized loops, so 
this will enable assembly both on Itanium and the 64-bit mode of 
Opteron. For marketing reasons Intel didn't say it explicitly, but 
their new 64-bit mode announced last week should be 100% compatible as 
far as I can tell from the documentation.

You'll probably see a factor 2 improvement on ia64 with the assembly 
loops, both in single and double.



On Feb 25, 2004, at 1:59 AM, Michel Cuendet wrote:

> Hi,
>  I don't know about xeons, but I have compared Itanium2 1GHz and 
> opteron 1.4GHz. Itanium is 40% slower. It's really hard to reach the 
> theoretical power of an itanium without highly optimized code. For a 
> definite answer we should wait for the assembly loops, though.
>  If I were you, I would definitely go for either xeon or opteron, and 
> buy a fast switch with it. This would still amount to about half the 
> price of as many itanium2 cpu's, and save you a lot of headaches in 
> installing software...
>  Bye,
> Michel
>> Message: 7
>> Date: Tue, 24 Feb 2004 20:51:47 +0530
>> From: Y U Sasidhar <sasidhar at chem.iitb.ac.in>
>> To: "gmx-users at gromacs.org" <gmx-users at gromacs.org>
>> Subject: [gmx-users] itanium2 vs xeon
>> Reply-To: gmx-users at gromacs.org
>> We are looking at purchase options involving itanium2(dual) and 
>> xeon(dual) servers. Itanium2 is 4 times costlier than xeon machine ! 
>> In this context I have the following querys.
>> 1. Are assembly loops implemented on itanium2 ?
>> 2.  What is the OS used ? Mandrake Linux (64 bit )? What other Linux 
>> versions available ?
>> 3. How does itanium2 1 GHz, compare to Xeon at 2.8 GHz for GROMACS
>> -- Sasidhar
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