Re: [Beowulf] bring back 2012?

> > > iirc a typical 1U fan dissipates up to ~3W, but that's only when running > > full on (screaming 14krpm...). not to mention the wide availability of > > simple 4-system-in-2u chassis (more efficient fans). > > i don't have any empirical evidence only 2nd hand information from > when i was an

Re: [Beowulf] bring back 2012?

of course, that measurement was done under full load in air and in fluid. The inbetween case of the direct contact solutions would obviously use less... but I've got no idea how much. On Tue, Aug 23, 2016 at 7:40 AM, Stu Midgley wrote: > I measured the power draw of our 2RU 8 phi nodes with and

Re: [Beowulf] bring back 2012?

I measured the power draw of our 2RU 8 phi nodes with and without fans... the fans draw about 20% power. On a 2200kW node that's considerable. On Tue, Aug 23, 2016 at 5:36 AM, Mark Hahn wrote: > Extra, the direct contact cooling stuff must still have the fans in the >> nodes to keep the dimms/d

Re: [Beowulf] bring back 2012?

On Mon, Aug 22, 2016 at 5:36 PM, Mark Hahn wrote: >> Extra, the direct contact cooling stuff must still have the fans in the >> nodes to keep the dimms/disks/power supplies cool... thus use considerably >> more power than nodes without fans. > > > why do you say "considerably"? 1u muffin fans are

Re: [Beowulf] bring back 2012?

Extra, the direct contact cooling stuff must still have the fans in the nodes to keep the dimms/disks/power supplies cool... thus use considerably more power than nodes without fans. why do you say "considerably"? 1u muffin fans are annoying and not that efficient, but even 1U could still use

Re: [Beowulf] bring back 2012?

FWIW the direct contact solutions (wether they use water or some other dielectric fluid) as far as I can see have several main problems * complexity (all that plumbing and getting it to 8 phi's + 2 cpu's all crammed in 2RU) * nodes have to be modified after the come out of the factory for bouti

Re: [Beowulf] bring back 2012?

On 08/22/2016 11:46 AM, Stu Midgley wrote: On Mon, Aug 22, 2016 at 11:22 PM, Stu Midgley > wrote: While the risk of an explosion is a certainly a theoretical possibility, In practice, the risk of this is virtually non-existent for a variety

Re: [Beowulf] bring back 2012?

On 08/22/2016 11:22 AM, Stu Midgley wrote: While the risk of an explosion is a certainly a theoretical possibility, In practice, the risk of this is virtually non-existent for a variety of reasons. With water, the processors and other heat-generating components would fail

[Beowulf] ARM aims at HPC with new instruction set

ARM V8-A adds scalable vector extensions: http://www.anandtech.com/show/10586/arm-announces-arm-v8a-with-scalable-vector-extensions-aiming-for-hpc-and-data-center ___ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your

Re: [Beowulf] bring back 2012?

FWIW the direct contact solutions (wether they use water or some other > dielectric fluid) as far as I can see have several main problems > > * complexity (all that plumbing and getting it to 8 phi's + 2 cpu's all > crammed in 2RU) > * nodes have to be modified after the come out of the factory >

Re: [Beowulf] bring back 2012?

On Mon, Aug 22, 2016 at 11:22 PM, Stu Midgley wrote: > > > >> While the risk of an explosion is a certainly a theoretical possibility, >> In practice, the risk of this is virtually non-existent for a variety of >> reasons. >> >> With water, the processors and other heat-generating components woul

Re: [Beowulf] bring back 2012?

> > I'm still skeptical. You still need space for people to walk through the > tanks on one side, and cabling on the other side. I can see how the cabling > aisle takes up less space than a hot aisle, but I'm sure it must still be > wide enough for someone to walk through so they can install/remove

Re: [Beowulf] bring back 2012?

> While the risk of an explosion is a certainly a theoretical possibility, > In practice, the risk of this is virtually non-existent for a variety of > reasons. > > With water, the processors and other heat-generating components would fail > from the heat before the boiling point of water is reache

Re: [Beowulf] bring back 2012?

On 08/20/2016 10:03 AM, Stu Midgley wrote: I don't need to try to do that, because that's the job of the engineers at Asetek, CoolIT and their OEM partners. I've looked at their solutions every year they've been as SC, and the packaging is quite neat, and included heat exchange

Re: [Beowulf] bring back 2012?

On 08/20/2016 09:52 AM, Stu Midgley wrote: * try and get a permit to hold large volumes of it in a computer room * try and find a computer room that will allow it in * the above two are mostly due to the low boiling point of the fluid I understand that. That's why they

Re: [Beowulf] bring back 2012?

I don't know of any specifically, but I'm sure they exist. I'm sure Google could find something for you. Prentice On 08/19/2016 02:09 PM, Jonathan Aquilina wrote: What about normal pc cases are there any that are specifically made for this purpose? On 2016-08-19 19:51, Prentice Bisbal wrot