Sunny King



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LegendaryActivity: 1205Merit: 1003 Re: [XPM] [ANN] Primecoin Release - First Scientific Computing Cryptocurrency July 14, 2013, 07:30:02 AM #1912 The growth of mining power on the primecoin network is enormous that I am speechless right now. This is due to a combination of more computers joining the network and continued miner improvements.



Some people raised the question that why difficulty is not adjusted fast enough. The difficulty adjustment speed is calibrated to maximize security while keeping a reasonable adjustment speed. If it adjusts too fast it would be easier to manipulate difficulty for the purpose of reducing the cost of 51% attack, and other oscillation inducing mining exploits.



The current difficulty is approaching the step-up to difficulty 8 (about to happen today). This means within the first week the difficulty already adjusted by about 30x, from initial difficulty 7 at the release, not all that slow at all. However, the mining power on the network has grown about 1000x from the first day of the network. That's why we are seeing the block spacing gradually dropping to the seconds range. The orphan rate on the network is expected to stay relatively high for the next couple of days, while difficulty plays catchup to the growth of mining power on the network.



This phenomenon is a one-off occurrence, could last another week. It likely would not happen again in the future.



So let watch and celebrate the cross to difficulty 8 today

matt4054



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LegendaryActivity: 1610Merit: 1010BitcoinQueue.com Re: [XPM] [ANN] Primecoin Release - First Scientific Computing Cryptocurrency July 14, 2013, 07:49:37 AM #1918 Quote from: Foamy on July 14, 2013, 07:42:00 AM

worth it? maybe, I will let it run for a few days and see if they make anything.

I have it running on my mining rigs. Cheapie amd quad cores pulling 4200 each but its dropping my mining speed by 8%worth it? maybe, I will let it run for a few days and see if they make anything.

I have also noticed a 5-20% hashrate drop on some of my rigs, others unaffected.

SHA-256 hashing not affected, only scrypt (which is the only useful one for GPUs nowadays I guess).



It doesn't affect my low hashrate rigs (<300 kh/s scrypt), only higher hashrates are affected.

Sometimes, lowering CPU priming to n-1 cores leaves the hashrate unaffected, but not on my 7970s, they go from about 700 to 585.



I have also noticed that the higher the intensity (in cgminer), the more sensitive it is to CPU usage.



The problem happens on Windows x64, Linux untested. I tried to lower the priority of the primecoin process in the task manager, without success in preserving the hashrate.



Any other feedback about this? I have also noticed a 5-20% hashrate drop on some of my rigs, others unaffected.SHA-256 hashing not affected, only scrypt (which is the only useful one for GPUs nowadays I guess).It doesn't affect my low hashrate rigs (<300 kh/s scrypt), only higher hashrates are affected.Sometimes, lowering CPU priming to n-1 cores leaves the hashrate unaffected, but not on my 7970s, they go from about 700 to 585.I have also noticed that the higher the intensity (in cgminer), the more sensitive it is to CPU usage.The problem happens on Windows x64, Linux untested. I tried to lower the priority of the primecoin process in the task manager, without success in preserving the hashrate.Any other feedback about this?