will the iPad be supported? [No]

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will the iPad be supported? [No]

Postby Miller855 » Fri Feb 05, 2010 3:27 am

since the iPads use an Apple chip not an intel chip, and they come with WiFi &3G, will there be a client for them to fold with?
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Re: will the iPad be supported?

Postby bruce » Fri Feb 05, 2010 4:27 am

FAH is not suited for any battery powered device. It uses the CPU at maximum power continuously.

Generally speaking, FAH does not plan to support new devices. If a new platform comes along that generates a wider following than the currently suppored OSs, they'll probably seriously consider it. Otherwise they'll probably concentrate on doing better science with the platforms that are currently supported.
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Re: will the iPad be supported?

Postby Ravage7779 » Fri Feb 05, 2010 5:34 am

Even if you ran windows with the citrix program thats supposedly coming out for the ipad/iphone, to run the windows uniprocessor client, i think you would cook the chip running it flat out for long periods of time. You would also have to leave it plugged into a power source all the time, and the performance is more than likely to be abysmal.
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Re: will the iPad be supported?

Postby toTOW » Fri Feb 05, 2010 9:00 am

Like many mobile devices (iPhone, Pocket PC, SmartPhones, ...), iPad CPU is based on ARM architecture, not x86.

ARM is designed to be energy efficient ... but definitely not for computing. You can search on the forum about iPhone ... there have been threads about it, and I think everything has already been covered there.
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Re: will the iPad be supported?

Postby Slash_2CPU » Fri Feb 05, 2010 7:46 pm

iPad is powered by an Apple custom CPU called A4. It has graphics, and memory controller onboard. It's a 1 GHz chip with 4 cores that are basically ARM Cortex A9. Figure 2.5 MIPS, and 1.5 MFLOPS per core. That's max theoretical performance, so 50-80% of that real-world. Around 7 MIPS and 3.5 MFLOPS would be a reasonable expectation.

As a comparison, a Core i7 920 benches at 81,100 MIPS and 69,180 FLOPS.

You could reasonably expect, with your iPad plugged in 24x7 to get 5-15 PPD.
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Re: will the iPad be supported?

Postby codysluder » Fri Feb 05, 2010 10:07 pm

Slash_2CPU wrote:You could reasonably expect, with your iPad plugged in 24x7 to get 5-15 PPD.


and all the iPads that might ever run FAH at the same time would add up to the equivalent of one high-end GPU. :!: :lol:
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Re: will the iPad be supported?

Postby Miller855 » Mon Feb 08, 2010 5:42 pm

oh ok, i thought since a $299 ps3 does 1000 ppd, an ipad would do a little more, plus be mobile like a laptop
thanks for all the info
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Re: will the iPad be supported?

Postby ChelseaOilman » Mon Feb 08, 2010 6:14 pm

Miller855 wrote:i thought since a $299 ps3 does 1000 ppd

It doesn't have anything to do with price. The PS3 has a cell 8 core processor. :wink:
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Re: will the iPad be supported?

Postby John_Weatherman » Mon Feb 08, 2010 11:22 pm

Beberg wrote:As a rule, nothing that runs on a battery will ever be a client of a distributed computation system like F@h.

And yes, the number & percentage of people buying/using computers that plug in and are on 24/7 is falling faster then a sack of potatoes tossed over Niagara Falls.

I assume then that that is a long term problem for distributed computing projects.
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Re: will the iPad be supported?

Postby 7im » Mon Feb 08, 2010 11:24 pm

John_Weatherman wrote:I assume then that that is a long term problem for distributed computing projects.


Which gets offset by Moore's law quite easily, IMO. ;)
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Re: will the iPad be supported?

Postby VijayPande » Mon Feb 08, 2010 11:46 pm

John_Weatherman wrote:
Beberg wrote:As a rule, nothing that runs on a battery will ever be a client of a distributed computation system like F@h.

And yes, the number & percentage of people buying/using computers that plug in and are on 24/7 is falling faster then a sack of potatoes tossed over Niagara Falls.

I assume then that that is a long term problem for distributed computing projects.


I think Adam is being very much the alarmist here. The facts are that we've continued to steadily *grow* and that hasn't changed recently. It does help that people do want to play games, games require GPUs, GPUs kill batteries, but are great for FAH.
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Re: will the iPad be supported?

Postby Wrish » Tue Feb 09, 2010 6:56 am

Slash_2CPU wrote:iPad is powered by an Apple custom CPU called A4. It has graphics, and memory controller onboard. It's a 1 GHz chip with 4 cores that are basically ARM Cortex A9. Figure 2.5 MIPS, and 1.5 MFLOPS per core. That's max theoretical performance, so 50-80% of that real-world. Around 7 MIPS and 3.5 MFLOPS would be a reasonable expectation.

As a comparison, a Core i7 920 benches at 81,100 MIPS and 69,180 FLOPS.

You could reasonably expect, with your iPad plugged in 24x7 to get 5-15 PPD.

If A4 really is quad core, that would be a theoretical 6 GFLOPS... 1.5 DP FLOPS/cycle, same rate as Atom.
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Re: will the iPad be supported?

Postby toTOW » Tue Feb 09, 2010 9:20 am

Even an old P4 core @ 3 GHz produces ~1 GFLOPS according to the FAH client ... the 1.5 MFLOPS of the ARM Cortex A9 is definitely too weak to be of any use for FAH.

Again, ARM CPUs are not designed for heavy calculation applications : they're designed for power efficiency and light embedded applications.

Also, they don't use the same instruction set as x86 CPUs, so it would require a complete rewrite of the cores, which will never happen as the amount of work to port them wouldn't be payed back by the potential computational power.
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Re: will the iPad be supported?

Postby Slash_2CPU » Wed Feb 10, 2010 6:35 am

Wrish wrote:
Slash_2CPU wrote:iPad is powered by an Apple custom CPU called A4. It has graphics, and memory controller onboard. It's a 1 GHz chip with 4 cores that are basically ARM Cortex A9. Figure 2.5 MIPS, and 1.5 MFLOPS per core. That's max theoretical performance, so 50-80% of that real-world. Around 7 MIPS and 3.5 MFLOPS would be a reasonable expectation.

As a comparison, a Core i7 920 benches at 81,100 MIPS and 69,180 FLOPS.

You could reasonably expect, with your iPad plugged in 24x7 to get 5-15 PPD.

If A4 really is quad core, that would be a theoretical 6 GFLOPS... 1.5 DP FLOPS/cycle, same rate as Atom.



No, no, no. Not "GFLOPS," "MFLOPS." 1000x slower.
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Re: will the iPad be supported?

Postby ihaque » Wed Feb 10, 2010 9:42 am

Slash_2CPU wrote:
Wrish wrote:
Slash_2CPU wrote:iPad is powered by an Apple custom CPU called A4. It has graphics, and memory controller onboard. It's a 1 GHz chip with 4 cores that are basically ARM Cortex A9. Figure 2.5 MIPS, and 1.5 MFLOPS per core. That's max theoretical performance, so 50-80% of that real-world. Around 7 MIPS and 3.5 MFLOPS would be a reasonable expectation.

As a comparison, a Core i7 920 benches at 81,100 MIPS and 69,180 FLOPS.

You could reasonably expect, with your iPad plugged in 24x7 to get 5-15 PPD.

If A4 really is quad core, that would be a theoretical 6 GFLOPS... 1.5 DP FLOPS/cycle, same rate as Atom.



No, no, no. Not "GFLOPS," "MFLOPS." 1000x slower.


Somebody dropped a unit there. The ARM cores are rated at about 2 integer ops/cycle (give or take), and their synthesizable FPUs are around 1-2 MFLOPs/MHz. Naively, this would give you 1-2 GFLOPs/core (SP or DP is unclear). However, the FPU is an optional part of the ARM architecture, and it's not even clear that those synthesizable cores can run that fast.

As far as I know, Apple haven't released specifications for their CPU. Without a full-clock-rate FPU, it would not even be in the right league. Even with one, it's not a device with the kind of performance that would be worth the effort of a port.
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