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Old 2016-02-29, 12:31   #100
henryzz
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https://shop.pimoroni.com/products/raspberry-pi-3
Should be a fair bit faster than the previous model. Still has only 1GB of memory though so will struggle to have 4 programs running at once.
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Old 2016-02-29, 14:29   #101
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Quote:
Originally Posted by henryzz View Post
https://shop.pimoroni.com/products/raspberry-pi-3
Should be a fair bit faster than the previous model. Still has only 1GB of memory though so will struggle to have 4 programs running at once.
It would be noce to test it as a "parallel" siever using ppsieve, npsieve or MMpsieve, all having a very small memory footprint...
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Old 2016-02-29, 16:45   #102
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My TX1 has arrived! I will have a play with it this evening.

The slightly silly feature is that it is a mini-ITX motherboard with a camera module on the motherboard; silly in that I'm going to be putting it into a case (the one my Xeon-D board was in before I sold it) and the camera will have little to look at.

Amusingly the heatsink on the Jetson TX1 is larger than the one on the Xeon D-1540.
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Old 2016-02-29, 18:15   #103
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Quote:
Originally Posted by fivemack View Post
My TX1 has arrived! I will have a play with it this evening.
Great I'm resisting the temptation until a 64-bit user filesystem is officially released including CUDA support.

Quote:
Amusingly the heatsink on the Jetson TX1 is larger than the one on the Xeon D-1540.
I hope there's no need for a fan even when pushing the GPU hard.
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Old 2016-02-29, 19:22   #104
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Quote:
Originally Posted by henryzz View Post
https://shop.pimoroni.com/products/raspberry-pi-3
Should be a fair bit faster than the previous model. Still has only 1GB of memory though so will struggle to have 4 programs running at once.
It would be nice for me to have such a device -- 64-bit capable. A lot of my code is 64 bit integer, and the power draw of the Pi-3 is attractive to me. I will see what the competition, such as Odroid, has to offer over the coming months
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Old 2016-02-29, 20:55   #105
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I have got the TX1 out of its box, and it sits there and runs 32-bit Linux perfectly happily; the first thing I did was to build gmp-ecm for it, which is no faster than it was on the TK1 presumably because it's a 32-bit binary and can't use the wide multiply instructions. Running four threads of gmp-ecm is not enough to make the fan turn.
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Old 2016-03-01, 10:14   #106
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Default GMP-ECM stage 2 memory tradeoff

Memory usage by GMP-ECM looks to be roughly quantised in powers of two times 100MB. Testing on a Xeon box with

Code:
echo "(2^909-1)/2305340678742833263/341117531003194129" | /usr/bin/time ecm -v -maxmem 120 -c 1 1e4 B2
Code:
B2   maxmem	usedmem	time/s		time ratio
1e11 none 	407M	54		(1.00)
1e11 120  	99M	85		1.57
1e12 none 	801M	373.665	       (1.00)
1e12 400	408M	589.291		1.58
1e12 200	201M	1420.189	3.80
1e12 100	100M	2396.19		6.41
1e13 none	3260M	1067.27		(1.00)
1e13 100	103M	21176.37	19.84
So this sounds as if a sufficient number of sufficiently cheap low-memory machines might be a reasonable adjunct to a GPU for ECM.

Last fiddled with by fivemack on 2016-03-01 at 10:15
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Old 2016-03-01, 10:34   #107
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Quote:
Originally Posted by fivemack View Post
Memory usage by GMP-ECM looks to be roughly quantised in powers of two times 100MB. Testing on a Xeon box with

So this sounds as if a sufficient number of sufficiently cheap low-memory machines might be a reasonable adjunct to a GPU for ECM.
The GPU doing the B1 in parallel and the TX1/Pi3 doing B2 in increasing blocks?
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Old 2016-03-01, 17:35   #108
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Quote:
Originally Posted by fivemack View Post
I have got the TX1 out of its box, and it sits there and runs 32-bit Linux perfectly happily; the first thing I did was to build gmp-ecm for it, which is no faster than it was on the TK1 presumably because it's a 32-bit binary and can't use the wide multiply instructions. Running four threads of gmp-ecm is not enough to make the fan turn.
My understanding is that the kernel is 64-bit. You could perhaps try to cross-compile and statically link to get a runnable 64-bit executable?
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Old 2016-03-02, 23:25   #109
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Hardkernel Odroid-C2 released
http://www.hardkernel.com/main/produ...=G145457216438
$40 (probably excluding shipping)

-Amlogic ARM 4x Cortex-A53 @2GHz
-Mali-450 GPU (3 Pixel-processors + 2 Vertex shader processors) @700MHz
-produced on 28nm
-2GB DDR3 32bit @912MHz
-Gigabit Ethernet
-HDMI 2.0 4K/60Hz display
-H265 4K/60FPS and H264 4K/30FPS capable VPU
-eMMC5.0 / UHS-1 MicroSD Card slot
-4x USB 2.0
-Infrared Receiver
-Ubuntu 16.04 or Android 5.1 Lollipop (based on Kernel 3.14)
-85 x 56 mm
-40 (metric) grams

Estimated power usage 2-5W for average operation.
A bit better specs than the Raspberry Pi3, but also a few dollars more and a smaller userbase. I might be interesting to play with it for a few bucks .

[edit2]
Just noticed you can order from a shop in Germany, that is much better than my order for the Odroid-U2. I ordered the Odroid-U2 from their website and it took a long time before it arrived. I also had to pay import taxes, which UPS charged me a hefty 20 euros handeling fee for.

Last fiddled with by VictordeHolland on 2016-03-02 at 23:34 Reason: extra info, and another edit :P
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Old 2016-03-03, 12:01   #110
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Quote:
Originally Posted by VictordeHolland View Post
Hardkernel Odroid-C2 released

A bit better specs than the Raspberry Pi3, but also a few dollars more and a smaller userbase. I might be interesting to play with it for a few bucks .
Let us know your impressions, as a number cruncher
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