Re: [Beowulf] Quantum Chemistry scalability for large number of processors (cores)

2012-09-28 Thread Mikhail Kuzminsky
Thu, 27 Sep 2012 11:11:24 +1000 от Christopher Samuel sam...@unimelb.edu.au: -BEGIN PGP SIGNED MESSAGE- On 27/09/12 03:52, Andrew Holway wrote: Let the benchmarks begin!!! Assuming the license agreement allows you to publish them.. :-) For example: Gaussian-09/03/... licenses

Re: [Beowulf] cluster building advice?

2012-09-28 Thread Gerald Henriksen
On Wed, 26 Sep 2012 23:59:13 +0200, you wrote: Yes easily. Google for what linus posted there and what i posted there in code around 2007 already. Where i showed how f'ed up GCC was, where it basically modified some simple code sample to something ugly slow, instead of creating a CMOV

Re: [Beowulf] cluster building advice?

2012-09-28 Thread Gerald Henriksen
On Wed, 26 Sep 2012 10:54:01 +0200, you wrote: There's nearly nothing there at that link. Just a handful of SRPMS. All of the SRPMS for SL are there. My point of openfabrics is: most people build a cluster in order to be have more performance than a single machine can give. Not seldom that's

[Beowulf] let's standardize liquid cooling

2012-09-28 Thread Mark Hahn
I have a modest proposal: standardize the location of liquid-cooled cold plates in each 19 rack. nodes would have internal heatpipes from heat sources (presumably CPUs mostly) to plates along the sides to mate/contact with the rack. I have an aging machineroom with ~50 racks, with the compute

[Beowulf] another crazy idea

2012-09-28 Thread Mark Hahn
in the spirit of Friday, here's another, even less realistic idea: let's slide 1U nodes into a rack on their sides, and forget the silly, fussy, vendor-specific, not-that-cheap rail mechanism entirely. how often do you actually pull out nodes, and of those few times, how often do you really need

Re: [Beowulf] another crazy idea

2012-09-28 Thread Andrew Holway
2012/9/28 Mark Hahn h...@mcmaster.ca: in the spirit of Friday, here's another, even less realistic idea: let's slide 1U nodes into a rack on their sides, and forget the silly, fussy, vendor-specific, not-that-cheap rail mechanism entirely. That sounds almost as good as submerging your servers

Re: [Beowulf] another crazy idea

2012-09-28 Thread Eugen Leitl
On Fri, Sep 28, 2012 at 03:44:09PM -0400, Douglas Eadline wrote: Not so crazy. Years ago I had some L shaped pieces of steel made that allowed nodes to slide in horizontally as you describe (and for the same reasons). It provided enough of a lip to support the node that was attached

Re: [Beowulf] another crazy idea

2012-09-28 Thread Lux, Jim (337C)
-Original Message- From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On Behalf Of Douglas Eadline Sent: Friday, September 28, 2012 12:44 PM To: Mark Hahn Cc: Beowulf Mailing List Subject: Re: [Beowulf] another crazy idea Not so crazy. Years ago I had some L shaped

Re: [Beowulf] let's standardize liquid cooling

2012-09-28 Thread Lux, Jim (337C)
I have a modest proposal: That's always a tricky phrase.. fortunately you're not talking about novel food sources here. standardize the location of liquid-cooled cold plates in each 19 rack. nodes would have internal heatpipes from heat sources (presumably CPUs mostly) to plates along the

Re: [Beowulf] let's standardize liquid cooling

2012-09-28 Thread Bill Broadley
Sounds expensive, complicated, and challenging. How about a MUCH simpler proposal: eliminate fans from compute nodes. Nodes should: * assume good front to back airflow Racks would: * have large fans front AND back that run at relatively low rpm, and relatively quiet. * If front or rear door

Re: [Beowulf] let's standardize liquid cooling

2012-09-28 Thread Alan Louis Scheinine
Jim Lux wrote: Whatever happened to a Beowulf made of tower cases piled on brick and board book cases? Many years ago at a European Supercomputer Conference I saw a vendor selling a cluster as a set of short tower cases. Slightly more seriously, in the past a topic of the Beowulf mailing list

Re: [Beowulf] let's standardize liquid cooling

2012-09-28 Thread Mark Hahn
Sounds expensive, complicated, and challenging. I donno - it seems elegantly modular to me. vendors are responsible for getting the heat to the cold plate (via heatpipes, probably. these days, heatpipes are extremely widespread and well-controlled. every laptop has them, many GPU cards and