Quote from: timertrainer on July 30, 2015, 02:18:41 AM

Quote from: Sergio_Demian_Lerner on July 29, 2015, 05:44:59 PM

AXIOM developers pinged me to give an opinion on the GPU speedup of the AXIOM PoW function.

I wrote the draft of the paper about RandMemoHash back in 2013, after playing with RandMemoHash a bit. I tested it with a SINGLE GPU (that was even older), and could not get any speedup. My paper does not show any proof, not any real world comparison over several GPU models, so it is definitively unfinished. The suggested parameters are not proven to be valid for all existent GPU models (and less for future models). People should never take for granted what an non-peer-reviewed privately-published draft paper says.

I would have liked that Axiom developers would have pinged me to give an update on it before implementing it.

Having said this, I find that a 5x GPU speedup quite good resistance, considering that a GPU is generally better than a CPU in almost every task. CPUs are good at executing large programs, doing paging, protecting memory, doing I/O. Nothing that a PoW can make use of.

GPU memory system is designed for throughput, and it has generally about 6 times the bandwidth available to a CPU. RandMemoHash bottleneck is the DDR/GDDR memory bus, so that speedup can be expected.

Also you must consider power-usage in the equation: that may make it better or worse for GPU-mining.

I don't know if tweaking the parameters would improve it. Maybe using 8 MB instead of 2 MB can prevent the use of some L2 caches in some boards. But the more space you require, the slower it is to verify the PoW. And this is a cat-and-mouse race, since future models will probably increase the size of the cache.

The Axiom developers & community could collect some real world numbers and try to find an improved parameter set (if it is really needed and if there is a better one).

I wish AXIOM users the best luck.

Sergio.

Wow, straight from the horse's mouth! Thanks a lot for your input Mr. Lerner, I hope we'll see some revolutionary results from AXIOM.

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but the real thing i see here is this... your dev CAN get the security blah blah of the BITCOIN FOUNDATION to come here and do anything (HINT) why do you think he would do something for this dev whoever it is MUST be A PEER of lerner .... see what i AM getting at us "AXIOTS" must be a part of something that is on that same level WOW
can u believe it there is magic in the air