The original question was about relatively small messages - only 500 bytes each
You can often get better throughput if you send say two smaller messages rather
than one large one.
This is since the interconnect can generate multiple RDMA requests that can
proceed concurrently.
This old paper fr
And anyway - I thought the maximum size for ext3 was 8TB ?
I know that there are patches to bring it up to 16TB, but does anybody trust
these and use them for production systems?
Daniel
-Original Message-
From: beowulf-boun...@beowulf.org [mailto:beowulf-boun...@beowulf.org] On
Behalf
Kilian,
Well you shouldn't be using your bare fingers.
Everyone has their own preferred trick. I put a small straight blade
screwdriver in the hole, and then pop in the cage nut by hand using the
screwdriver as a 'shoehorn'
Daniel
-Original Message-
From: beowulf-boun...@beowulf.org [
On Thu, 5 Feb 2009, Gus Correa wrote:
> Dear Beowulfers
>
> A mundane question:
>
> What is the right lubricant for computer rack sliding rails?
> Silicone, paraffin, graphite, WD-40, machine oil, grease, other?
I wonder if NASA use Astroglide?
___
Be
On Thu, 5 Feb 2009, Gus Correa wrote:
> Dear Beowulfers
>
> A mundane question:
>
> What is the right lubricant for computer rack sliding rails?
> Silicone, paraffin, graphite, WD-40, machine oil, grease, other?
We have never had a problem with sticking sliding rails.
But then we use Crisco Switc
Mark Hahn wrote:
>Quadrics is a bit of an enigma to me - we're still going strong with our
>Elan4 systems, but I don't really understand Quadrics future plans.
>they seem to be morphing into a 10GE vendor, but do they have any unique
>value-add?
Quadrics are not "really morphing into a 10GE vendo
And I am sure Iceland would find it much easier to do the machine room cooling
than say Spain or the Southern USA
Daniel
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of stephen mulcahy
Sent: 10 December 2008 08:21
To: Vincent Diepeveen
Cc: Beowulf Maili
If I had that much money, I too would try and buy a Nobel Prize in preference
to a yacht.
D.
-Original Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Lawrence Stewart
Sent: 05 December 2008 16:18
To: Robert G. Brown
Cc: Beowulf Mailing List; Lux, James P
Subject
I too had an interview with DE Shaw Research a while back before I took up my
current position
At the time they did not have a UK office, and moving to NY was out of the
question for me.
In recent times they have been more open - and even gave a Keynote talk at this
years' ISC in Dresden.
As pr
I am not so sure that wood is as flammable as you think.
Hard wood needs sustained heat for a reasonably long period of time to get
going.
And anyway for a computer system there is no reason why you can't do some
fireproofing - get some borates, silicates or other salts to keep the organic
mat
John Hearns wrote:
> By the way, I live in London, UK. The news is our local government had lots
> of money in an Icelandic bank, which they've now lost.
> As a consequence, they are looking to sell off objects of historic
> significance which they own. I can put you in touch if you are looking
>
Looking at the CAD drawings - is there any reason why the nodes are built into
circular columns, rather than traditional cuboid boxes?
If anything such a design does not make full use of the physical space
available.
And if you did pack the columns as drawn (with vertical water pipes in the
ga
John,
Yes indeed at that Daresbury Machine Evaluation Workshop - quite a while ago -
maybe 2001 or 2002
Mike gave out as the freebie on their booth Boxer Shorts with the Streamline
logo on.
Compared with giving away say t-shirts, I am not sure how much market exposure
they got (!)
Daniel
Andrea,
MPI is of course used by many applications running on commercial clusters.
Two obvious examples are computational chemistry by the drug companies
and computational fluid dynamics (CFD) for aerospace companies and F1 design
teams.
These are all long-term 'traditional' uses of MPI for scie
Gilad wrote:
> It was proven by the same person who did the slides
> you referred to, when doing the same testing on IB DDR we got much
> better results with IB versus Quadrics. your theory does not really meet
> reality.
Care to describe to the list what these results were, and to speculate about
>-Original Message-
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Prentice Bisbal
>Sent: 08 July 2008 15:09
>Cc: beowulf@beowulf.org
>Subject: Re: [Beowulf] A press release
>
>Steffen Grunewald wrote:
>>
>> Which isn't true. Don't you remember MCC Interim Linux, back in t
John is correct here.
It is one thing to do long range climate prediction yourself using distributed
computing and tweaking the stochastics based on a set of starting conditions,
and another to try and work out if it will be sunny next Tuesday.
Weather modelling is a different animal to CP- you
>Hi Jon,
>We have our own stack which we stick on top of the customers favourite
>red hat clone. Usually Scientific Linux.
>
>Here is a bit more about it.
>
>http://www.clustervision.com/products_os.php
>
>We sell as a standalone product and it does quite well. I could even
>go so far to say that
Greg wrote:
> Many-core chips that look like a big x86 SMP don't look anything like
> a GPU. With the addition of a few commuications primitives, MPI
> will run even better on big x86 SMPs. All of the programming
> approaches for GPUs and Clearspeed and historical array processors
> are yucky comp
Chris Samuel wrote:
>- [EMAIL PROTECTED] wrote:
>> All head nodes should have the BIOS set to localboot first.
>
>We set the interface on the internal cluster network to
>PXE and the external to not.
I agree.
but note that if you use ROCKS, it insists on the other way round:
It wants to alw
Well I suppose we could make a stab at buildng a list here...
Omiting any companies that are based elsewhere but have UK offices (of which
there are quite a few)
Omitting all the Universities and Research centres that are writing HPC and
Grid software (Daresbury, Manchester, EPCC et al.)
Also om
Andrew,
You also need to state what *size* cluster you are targeting.
Some interconnects can provide hardware broadcast and do adaptive routing -
features which only start to show significant application speedup at larger job
sizes.
caveat: slightly biased view - I work for a vendor
Daniel
Michal et al.
I work for Quadrics.
What you are descibing is the original QsNet interconnect (aka Elan3) as used
in all Alphaserver SC machines like PSC and ASCI-Q.
The QM400 cards are PCI 66 MHz/64bit wide bus with 400MHz bi-directional links.
It is also known as the 3X-CCNNA-AA in HP/Compaq pa
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