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Author Topic: A new target device for Linux fractal software.....  (Read 1066 times)
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David Makin
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« on: April 19, 2012, 10:36:28 PM »

This is mega-brilliant - check it out....it speaks for itself.

http://www.raspberrypi.org/

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ker2x
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« Reply #1 on: May 14, 2012, 05:54:26 PM »

i pre-ordered mine in February, i should have it in July.
(yup, huge huge huge success)
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often times... there are other approaches which are kinda crappy until you put them in the context of parallel machines
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hobold
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« Reply #2 on: May 14, 2012, 06:58:52 PM »

The computational throughput per watt is probably okay, perhaps even performance per buck. But absolute performance is not particularly good compared to boring ordinary hardware. Remember the old trick question: "do you want to plow a field with two strong oxen or with 1024 chickens?"
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David Makin
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« Reply #3 on: May 15, 2012, 12:48:53 AM »

The computational throughput per watt is probably okay, perhaps even performance per buck. But absolute performance is not particularly good compared to boring ordinary hardware. Remember the old trick question: "do you want to plow a field with two strong oxen or with 1024 chickens?"

I was thinking of performance per buck - at £30 each buy 100 and with decent networking software (for appropriate tasks) it'll almost certainly outperform any single desktop costing £3000 (at least at UK prices) on either GPU or CPU.
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panzerboy
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« Reply #4 on: May 15, 2012, 02:31:10 AM »

I was thinking of performance per buck - at £30 each buy 100 and with decent networking software (for appropriate tasks) it'll almost certainly outperform any single desktop costing £3000 (at least at UK prices) on either GPU or CPU.

I don't the the performance per buck is superior compared to a good i7. Take the 700Mhz ARM7 of the 30 RasPis to give 21 GHz of ARM7 instructions. An i7 gives you 3Ghz+ by 4 cores, 12 Ghz of i7 instructions, but the i7 has a far superior SIMD engine capable of multiple (4?) 64bit arithmetic per instruction whearas the SIMD of the ARM1176JZFS can do (4?) 16 bit multiplications. So thats a fourfold speed advantage for arithmetic to the i7. 12Ghz x4 = 48Ghz plus there's the multi-threading giving maybe another 20%-30% so maybe 60 billion arithmetic ops for the i7 compared to 21 billion for the 30 ARM7s of the RasbPis.
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ker2x
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« Reply #5 on: May 15, 2012, 10:12:13 AM »

it's the SOC of the iphone3, it have opengl capability and can run quake3 smoothly (will it run fragmentarium ?  grin ).
Thingy like the RaspberryPi existed before (and still exist), but priced at $300 or more smiley

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often times... there are other approaches which are kinda crappy until you put them in the context of parallel machines
(en) http://www.blog-gpgpu.com/ , (fr) http://www.keru.org/ ,
Sysadmin & DBA @ http://www.over-blog.com/
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