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61  Alternate cryptocurrencies / Altcoin Discussion / Re: [Primecoin XPM] [LIVE CONTEST] Host For Bit might choose your answer - try it on: July 26, 2013, 02:57:25 PM
Easy and affordable Primecoin mining

APwkijfm8EZaAcJoxaCVucg9zs12t8vLpi

Also a website that still loads with noscript enabled XD
62  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 26, 2013, 02:44:54 PM
For the AMD folks... Bulldozer ONLY optimized HP8 client win 7 64

 *experimental* but works fine testnet with 8150s, 4300s,  waiting for block @ mainnet
 
Please pm me your improvements/results

https://rapidshare.com/#!download|975p2|1002487630|primecoin-qt.zip|8996|0|0|1|referer-64B46FF883A2345040D49683DE1E537C


*encrypt/backup wallet, never trust downloads on the internets... will not be held responsible, etc

Possibly stupid question but will this one be a good choice for AMD K-10s and/or AMD 1100t ?

I told my mother about my mining Primecoins and she decided to run the miner on her phenom II x4 - it's doing surprisingly well mining - she's getting around 4k pps and 8-10 cpm - around half of what my 3930k is getting right now. The main client might work well for an 1100t - It would be amazing if the Bulldozer client was better though - Only way we can find out is testing it, and I don't want to spend the time dealing with some other version of the client right now. It might be worth a shot testing it now.
63  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 26, 2013, 04:09:15 AM
but it will randomly drop down to 10 cpm and then jump back up

try setting roundsievepercentage : 40, it seemed to smooth results out for me with certain settings.

Right now it seems to be working fine and fairly stable with 30 - I'm just leaving the settings alone for now and just letting it mine So far I have gotten three blocks on my desktop (all on hp7) and one on my laptop (on hp8 now) just letting them sit and mine over the last three days - 1 block on 7/23 in the middle of the day, one on 7/24 in the early evening, one on 7/25 a little after midnight, and one about an hour ago on the laptop - seems fairly random as I haven't really played with my laptop settings yet and they definitely aren't optimized. Additionally all those I found on my desktop were on hp7 which meant they were effectively at a higher difficulty. I wonder how this will end up doing over the next day or two on hp8 - maybe we will find some even better settings that can get us a higher block rate.
64  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 26, 2013, 03:32:49 AM

Try ...

"roundsievepercentage" : 20,
"sievepercentage" : 8,
"sievesize" : 100000,

Thanks for the tip - I'm now getting 11k pps - I'm getting about 20 cpm now but it will randomly drop down to 10 cpm and then jump back up


23:32:42

{
"blocks" : 83418,
"chainspermin" : 21,
"currentblocksize" : 1000,
"currentblocktx" : 0,
"difficulty" : 9.26809406,
"errors" : "",
"generate" : true,
"genproclimit" : -1,
"roundsievepercentage" : 20,
"primespersec" : 11280,
"pooledtx" : 0,
"sievepercentage" : 8,
"sievesize" : 100000,
"testnet" : false
}
65  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 26, 2013, 03:16:18 AM
Seeing nearly 2x improvement.  Amazing, great work.

Code:
> ./primecoind getmininginfo
{
    "blocks" : 83381,
    "chainspermin" : 58,
    "currentblocksize" : 1000,
    "currentblocktx" : 0,
    "difficulty" : 9.26739043,
    "errors" : "",
    "generate" : true,
    "genproclimit" : -1,
    "roundsievepercentage" : 30,
    "primespersec" : 33445,
    "pooledtx" : 0,
    "sievepercentage" : 10,
    "sievesize" : 100000,
    "testnet" : false
}


What sort of hardware are you running this on right now? With my 3930k and those settings I get roughly 10k pps and anything from 10 to 40 cpm (still mostly at about 15)
66  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 26, 2013, 02:54:49 AM
Thanks for the update - I'm seeing roughly a 40% increase in pps right now - averaging 6400 instead of about 4600 before. I'm still getting roughly 10-20 cpm with an average of about 15-17 (no change). Now lets see if this affects how often I find blocks...
67  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 25, 2013, 02:57:49 PM
Will there be a hp8 release soon?

Probably yes. The current code is looking good now that the performance regression has been fixed.

Thanks for the update! I can't wait for the new hp8 release.
68  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 25, 2013, 03:28:08 AM
I might have found a bug in hp7. I copied the hp7 code over to Reaper, and found some weird behavior. I noticed that many shares/blocks it found, had a difficulty with a fractional part of 0.

Function: FermatProbablePrimalityTestFast. It does a Fermat test, and if it fails, it calculates the fractional part. However, there's a fast division test before the Fermat test. If the fast division test is succesful, the function is returned from and the fractional part isn't calculated. If it just happened to be the last number in a chain, the fractional part isn't calculated and is left at 0. This means if the difficulty is for example 6.2, and the miner found a block of difficulty 6.3, it's possible that the fractional part was left uncalculated, and the miner thinks it's difficulty 6.0. The block doesn't get submitted and lots of profit has been lost.

The same applies to EulerLagrangeLifchitzPrimalityTestFast.

Right now I don't have git set up, I can't submit a patch.

I updated to hp7 today on 13 i5 and i7s mining machines, only found 2 blocks in 14 hours, maybe I ran out of luck but I guess its the bug. I'm thinking about reverting to hp5 before going to sleep.

But then there is the issue of random crashes - I had no luck mining with hp5 or hp6 due to crashes every hour or so on my 3930k - did you experience this on hp5 with those machines at all?

I followed this guide to the end: http://ecoinomist.com/xpm-primecoin-mining-guide-on-linux
And there is a simple script + cronjob combo that takes care of the crash, if it happened to me I didn't notice. By using hp5 I found my first block in 4 hours.


When I was using hp5 and hp6 I didn't get anything for two days and when I installed hp7 yesterday I got a block within a half hour - It seems to come down to luck in the end - My first two days had nothing and then I got a block yesterday and today on hp7. I would really like to know how much of a difference it makes for you reverting back to hp5.
69  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 25, 2013, 03:12:05 AM
I might have found a bug in hp7. I copied the hp7 code over to Reaper, and found some weird behavior. I noticed that many shares/blocks it found, had a difficulty with a fractional part of 0.

Function: FermatProbablePrimalityTestFast. It does a Fermat test, and if it fails, it calculates the fractional part. However, there's a fast division test before the Fermat test. If the fast division test is succesful, the function is returned from and the fractional part isn't calculated. If it just happened to be the last number in a chain, the fractional part isn't calculated and is left at 0. This means if the difficulty is for example 6.2, and the miner found a block of difficulty 6.3, it's possible that the fractional part was left uncalculated, and the miner thinks it's difficulty 6.0. The block doesn't get submitted and lots of profit has been lost.

The same applies to EulerLagrangeLifchitzPrimalityTestFast.

Right now I don't have git set up, I can't submit a patch.

I updated to hp7 today on 13 i5 and i7s mining machines, only found 2 blocks in 14 hours, maybe I ran out of luck but I guess its the bug. I'm thinking about reverting to hp5 before going to sleep.

But then there is the issue of random crashes - I had no luck mining with hp5 or hp6 due to crashes every hour or so on my 3930k - did you experience this on hp5 with those machines at all?
70  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 24, 2013, 09:22:36 PM
mikaelh has been hard at work optimizing the code (10 new commits on bitbucket)

After an hour running this on mainnet I'm seeing consistently higher pps and chainspermin than with hp7 on an identical box

I think it's time for another round of donations to keep mikaelh going  Smiley

How much higher are you seeing? I would donate in primecoin now but I only mined my first block yesterday and it still is immature - it's going to be at least another day before I am able to use the coins.
71  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 24, 2013, 08:49:18 PM

You might be able to help me with a noob question.  Whenever I enable testnet=1 in my .conf file, I always end up with issues.
It always shows that it's out of sync, 2 weeks behind, and "no block source available".

What am I doing wrong?

I don't think you are doing anything wrong - it has another block chain on the test net and that needs to sync separately. I ran into some issues syncing with it with antivirus software (only for the first part). It might help to disable your firewall temporarily until you have part of the block chain and multiple block sources. Then again I'm a complete noob and might be goiing about this completely wrong - take what I say with a grain of salt.

Ok, I'm glad it's not just me.  I'll just hold tight then.

I just set up the software on my laptop and it took a few moments with no connection and now seems to be syncing. Waiting might help as there seem to be a few minor issues with getting your computer to sync at first.
72  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 24, 2013, 08:41:53 PM
Thanks for the explanation - I was just curious about settings since I'm using the default sieve size and sieve percentage  and don't know if changing them helps at all right now - I saw people discussing different settings making a difference on the testnet and was wondering if there were any better settings that I could use right now.

Your best bet is to run some test w/your box on testnet to find your settings. For v7 my best are 2M/8%, 2M/14% did well too. However, no blocks w/v4-v7 for me on i7 860 @ 3.22.

I do spend a lot of time on testnet though. I figured since I wasn't finding blocks I could at least find some good settings for any other i7 quad miners out there and I'll wait for the GPU miner.

You might be able to help me with a noob question.  Whenever I enable testnet=1 in my .conf file, I always end up with issues.
It always shows that it's out of sync, 2 weeks behind, and "no block source available".

What am I doing wrong?

I don't think you are doing anything wrong - it has another block chain on the test net and that needs to sync separately. I ran into some issues syncing with it with antivirus software (only for the first part). It might help to disable your firewall temporarily until you have part of the block chain and multiple block sources. Then again I'm a complete noob and might be goiing about this completely wrong - take what I say with a grain of salt.
73  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 24, 2013, 08:10:17 PM
Still getting new blocks mined on my i7-970 Gulftown at 3.2GHz (2 today, 2 yesterday). Maturing seem to take at least 48 hours, so I'm guessing a lot of machines have dropped out of the network.

What settings are you using and how many primes per second are you getting? I'm mining  on my 3930k and get anything from 4k to 5700 primes per sec and have only gotten one block in three days of mining.

It really is hard to tell if/when you'll get a block.
I don't mean that as in "I don't know how to calculate it", I mean it in the sense that "I'm not sure if it can be calculated".

Prime numbers and prime chains are quite fickle and inconsistent things.  With hash-based cryptocurrency, there's a certain uniformity and predictability with difficulty.  With primes and prime chains, there's some predictability, but not enough to get you a simple formula.  See the "Difficulty Adjustability of Proof-Of-Work" of the primecoin paper.

With hash based coins, the question is simply "if I throw dice with X sides, what's the odds I'll get a number lower than [difficulty]".
With primecoin, the question is "what's the odds that I'll find a chain of primes [difficulty] numbers long, with the next number not being prime and having a remainder greater than [difficulty]".


So yeah.  I have no idea (and neither does anybody else).


P.S.: Just because you're finding X primes/sec doesn't mean you'll find them with the correct properties.

Thanks for the explanation - I was just curious about settings since I'm using the default sieve size and sieve percentage  and don't know if changing them helps at all right now - I saw people discussing different settings making a difference on the testnet and was wondering if there were any better settings that I could use right now.
74  Alternate cryptocurrencies / Announcements (Altcoins) / Re: [XPM] [ANN] Primecoin High Performance on: July 24, 2013, 07:07:17 PM
Still getting new blocks mined on my i7-970 Gulftown at 3.2GHz (2 today, 2 yesterday). Maturing seem to take at least 48 hours, so I'm guessing a lot of machines have dropped out of the network.

What settings are you using and how many primes per second are you getting? I'm mining  on my 3930k and get anything from 4k to 5700 primes per sec and have only gotten one block in three days of mining.
75  Other / Beginners & Help / Re: New rig planned. advise? on: July 23, 2013, 01:28:43 PM
I would personally avoid a coolmax power supply, especially with extended load. From what I have heard about it they can be hit or miss in quality and when you invest that much money into a computer a bad power supply can be a big issue. I personally would recommend looking at the overclock.net recommended list of power supplies here: http://www.overclock.net/t/183810/faq-recommended-power-supplies

It also is a good idea to look at individual reviews for those power supplies since even when a company is reputable they can easily have a model with issues. Another thing to look into if you are bitcoin mining is cost and efficiency - with higher end equipment heat can be an issue and electrical costs build up. Depending on how long you plan to mine with the system it might be worth looking at some 80+ silver or platinum power supplies and to look at the cost of electricity over an extended period of time vs the added costs. In some cases it makes sense to go with a lower efficiency power supply due to budget constraints but sometimes it pays in the long run to get a better power supply.

As elwoodD said a few posts earlier it might be a good idea to get 7950s or other similar cards to get a higher hash rate if the cost is similar, but at the same time 6970s still are fairly good.

Would you mind telling us what ram you intend to use and what hardware you already own? Some manufacturers have better reputations than others and it's worth looking into specific warranties before purchasing products (i.e. ASUS has a decent warranty on their motherboards but support is hit and miss - I have had advanced replacements that took two months to get the refurbed board, I have had a brand new motherboard shipped in retail packaging within 2 weeks, and have heard of people getting back the same dead motherboard that they claimed to have fixed).
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