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Author Topic: How to estimate Network Speed for Guinness World Record  (Read 4993 times)
phelix
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September 30, 2011, 06:32:00 PM
 #21

I'm not sure why there has to be voodoo involved. Most of the bitcoin network is GPU-based (at the moment). Modern GPUs can perform true floating-point operations. So get the most popular GPUs in use, get their IOPS and FLOPS ratings, and use the median ratio for calculating the Guinnes world record value.
AMD uses a factor of 2 for their Radeon cards

we do not know how much of the Hashrate is generated from FPGAs for example which may not be able to do any FLOPs at all. I think non GPU computing power is still neglectable, though.


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kano
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October 02, 2011, 01:32:33 AM
 #22

Just in case you do actually send this to them ...
The PoW is actually a double sha256 (for that OPs/Hash number)

Also, it's very similar to sha256(sha256(data)) but not exactly
(part of the start isn't calculated every time and the end is cut short thus the actual value of sha256(sha256(data)) isn't completed)

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phelix
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October 02, 2011, 08:35:30 PM
 #23

Just in case you do actually send this to them ...
The PoW is actually a double sha256 (for that OPs/Hash number)

Also, it's very similar to sha256(sha256(data)) but not exactly
(part of the start isn't calculated every time and the end is cut short thus the actual value of sha256(sha256(data)) isn't completed)
yeah, Phateus explains it here: https://bitcointalk.org/index.php?topic=7964.msg550288#msg550288

he has releasd the most optimized public kernel so far.


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ptshamrock
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October 10, 2011, 01:09:47 PM
 #24

thx phelix for managing this here . I like it very much!!

A Fan !

"Money needs to be depoliticized, and the time has come for the separation of money and state to be accomplished."
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October 10, 2011, 02:46:36 PM
 #25

thx phelix for managing this here . I like it very much!!

A Fan !

thanks!  Grin

to really officially get the record we will have to bother Guinness some more...

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EricSU
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October 15, 2011, 12:49:06 AM
 #26

I don't think bitcoin will qualify as a "distributed computing network".
No work is distributed between bitcoin clients.
Each client works individually on its own block, its not a shared effort on the same job.

Pooled mining servers like deepbit is a distributed computing network.
Because the pool tells all nodes to work on the same block.
phelix
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October 15, 2011, 07:30:28 PM
 #27

I don't think bitcoin will qualify as a "distributed computing network".
No work is distributed between bitcoin clients.
Each client works individually on its own block, its not a shared effort on the same job.

Pooled mining servers like deepbit is a distributed computing network.
Because the pool tells all nodes to work on the same block.

they are all trying to find a block. is that very different from folding@home?

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kano
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October 18, 2011, 01:51:15 AM
 #28

I don't think bitcoin will qualify as a "distributed computing network".
No work is distributed between bitcoin clients.
Each client works individually on its own block, its not a shared effort on the same job.

Pooled mining servers like deepbit is a distributed computing network.
Because the pool tells all nodes to work on the same block.
Actually:
They are all trying to find the 'next' block.
Although the exact contents of each attempted solution is slightly different (every single hash done is slightly different), the effect of what everyone attempts is the same:

They are all trying to confirm outstanding transactions if any are available.

Even at a single pool, the difference you stated is still there.
Everyone is trying to find the 'next' block but with a different nonce value and with different transactions as more become available.
Each getwork may include new transactions for the same block
i.e. each getwork is different as with a similar difference as comparing 2 getworks from 2 different pools at the same time.

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