[Beowulf] Has DDR IB gone the way of the Dodo?

Michael Huntingdon hunting at ix.netcom.com
Sun Oct 5 02:51:21 EDT 2008


And once thought to be so the "C" word....(ummmm commercial)

Michael Huntingdon
Systems Performance Consultants
Higher Education Account Manager
(408) 294-6811
 

-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org]
On Behalf Of Bill Broadley
Sent: Friday, October 03, 2008 11:25 AM
To: alscheinine at tuffmail.us
Cc: NiftyOMPI Mitch; Beowulf Mailing List
Subject: Re: [Beowulf] Has DDR IB gone the way of the Dodo?

Alan Louis Scheinine wrote:
> NiftyOMPI Mitch wrote
>> QDR is interesting... in all likelyhood the
>> QDR game will be optical for any link further away than a single
rack.
>> Once IB goes optical there will be a lot of reason to install IB in
>> machine rooms and campus sites that are just out of reach today.
> 
> When will IB go optical at a reasonable price? 

Folks I know in the IB industry mentioned:
* QDR price life cycle should be similar to the DDR price life cycle.
* QDR Cable lengths over copper are rather poor
* fiber transceivers are finally starting to catch up.

QDR over fiber should be "reasonably priced", here's hoping that the
days of
Myrinet 250MB/sec optical cables will return.

Corrections/comments welcome.
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