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Author Topic: [ANN][GAP] Gapcoin - Prime Gap Search - New Math Algo - CPU / GPU - Zero Premine  (Read 285041 times)
Useless1d1ot
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March 12, 2015, 01:59:02 AM
 #1101

Just started mining for fun cause it sounds like a good cause. I like science and I can can count my fingers.

I got 5 virtual servers going for the moment. Will keep them going for as long as it's fun or I cannot affoard to lol
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h0g0f0g0
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March 13, 2015, 01:57:39 PM
 #1102

Good to see price so low, buy while it's cheap.

This coin is quite interesting, GPUs don't have advantage over CPUs, it's aiming for world record... I'm just hoping that community won't let it die.

@dev, thanks for a nice coin! We need more pools though.
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March 13, 2015, 10:54:25 PM
 #1103

I'll venture a hypothesis from various things I've read on this whole thread.  The miner sets up the sieve, in your case 2^25 (the shift being 25) and the resultant value as the required seive size - 33554432.  Now the question is how many primes to use.

All the primes chosen are (from my understanding) each multiplied by 3, then the miner starts with the highest value prime*3 and works backwards scanning for the desired gap length and not bothering with sections that obviously won't net a coin. So the largest prime value(times 3) would ideally stop just short of the end of the sieve.

So here is where a bit of math leg work comes in if you want to be precise.  Absolute value of 33554432/3 is 11184810.  The first prime less than that is 11184799.  11184799*3 is 33554397 which fits nicely near the top of the seive.  A check of bigprimes.net shows it as the 737948th prime and thus the number of primes for shift 25.

Can someone verify if this logic is correct?  I think the default primes is 500000,  Maybe it could be more efficient?  Also we could build a table of primes for different shift values, perhaps blocks would be found faster if everyone wasn't trying to scan 2^25 at the same time on each round.

Since revision 4, the default values are the same as from dcct's mod:
Code:
--shift 25 --sieve-primes 900000 --sieve-size 33554432

In the beginning, we sieve with the first n primes. For the first 2063689 primes, every prime eliminates at least one candidate in the sieve.
For the primes behind that point, the possibility for eliminating a prime candidate in the sieve decreases.

After sieving, the remaining prime candidates are scanned for prime gaps. When a prime is found while scanning the gap, the whole gap is skipped
and the miner scans the next possible gap in the sieve.

A more detailed description can be found here: https://github.com/gapcoin/Gapcoin-PoWCore

@j0nn9 - Any new performance improvements coming or nvidia miner?

Since i don't have any Nvidia cards, I'm not capable of porting the miner to Nvidia.

I tried a lot to improve the cpu-miner by using the Chinese Reminder Theorem, but it seems that Gapcoin's restriction on the prime numbers make it impossible to use the full potential of this method, so the current method is still faster.

From my point of view, the miner is probable at the performance limit, but maybe someone else does have some smart Ideas.

Even if we are currently a step away from the highest merit record, Gapcoin almost daily finds new first known occurrence prime gaps,
these are prime gaps of a specific length for that no gap with a greater merit is known.

Currently we have 589 of these records listed here:
Prime gaps from 4000 to 5998
Prime gaps from 6000 to 7998

Gapcoin frequently either beats its own records or breaks other new prime gap records.
I submit these records regularly to Dr. Nicely.
You can view the current new found records at these page: http://gapcoin.org/primegaps-length.php

Gapcoin - The largest, decentralized prime gap search
pdazzl
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March 14, 2015, 11:50:36 PM
 #1104

Since revision 4, the default values are the same as from dcct's mod:
Code:
--shift 25 --sieve-primes 900000 --sieve-size 33554432

In the beginning, we sieve with the first n primes. For the first 2063689 primes, every prime eliminates at least one candidate in the sieve.
For the primes behind that



----So why 900000 for --sieve-promes?  And where did you get the 2063699 number, is that independent of --sieve-primes?  Trying to understand the algo...it just seems like diversifying people over more shifts would reduce multiple workers testing the same numbers in a given round.

enerbyte
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March 21, 2015, 07:01:44 PM
 #1105

dev please edit exchanges

ph4nt0m
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March 22, 2015, 02:36:26 PM
 #1106

Dev, do you care to submit GAP to Cryptsy for voting?

https://www.cryptsy.com/coinvotes/
GreekBitcoin
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March 22, 2015, 07:07:04 PM
 #1107

Dev, do you care to submit GAP to Cryptsy for voting?

https://www.cryptsy.com/coinvotes/

I tried twice and j0nn9 tried but request threads on cryptsy helpdesk never showed up. Maybe you can try too to add a request on their help desk and be more lucky.

Actually you can see here https://cryptsy.freshdesk.com/support/search?term=gapcoin that something exists but if you click on the links it says 'The page you were looking for doesn't exist.'


Maybe we can send directly to their email support@cryptsy.com. I just sent an email. Feel free to do the same.

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March 22, 2015, 07:58:17 PM
 #1108

Dev, do you care to submit GAP to Cryptsy for voting?

https://www.cryptsy.com/coinvotes/

I tried twice and j0nn9 tried but request threads on cryptsy helpdesk never showed up. Maybe you can try too to add a request on their help desk and be more lucky.

Actually you can see here https://cryptsy.freshdesk.com/support/search?term=gapcoin that something exists but if you click on the links it says 'The page you were looking for doesn't exist.'


Maybe we can send directly to their email support@cryptsy.com. I just sent an email. Feel free to do the same.



mail sent  Smiley
pdazzl
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March 27, 2015, 11:33:26 PM
Last edit: March 29, 2015, 12:55:48 AM by pdazzl
 #1109

EDIT: Looks like someone fixed this on the gapcoin.org site  Grin

Ran some --shift 256 runs, found coins show up on the new records page of http://gapcoin.org/primegaps-length.php with gap length in the 8000 range.  Only half are actually new records, doesn't appear the site actually checks the 8000-9998 range on the records page - http://www.trnicely.net/gaps/g8k.html


length:        8112
old merit:        1.442695
old start:        2
new merit:        22.88258
new start:        9115291451982115717464026980430066984785137999242712505748096992024183892683588 753356028488798084375201600127838484517776351339399386629283785502233397039
record type:        New Gapcoin record

length:        8124
old merit:        1.442695
old start:        2
new merit:        22.897592
new start:        1220215349297001885574144429126752938292365419219480417931685298189736577070844 8777591533031424689113607238595630208821882024552945340914535249455005424253
record type:        New Gapcoin record

length:        8262
old merit:        1.442695
old start:        2
new merit:        23.286389
new start:        1223147107683751149098486211715724617042495711535174050186615384744484320503218 9168067504444887128863283298436610049128739703828350470072065477764102201207
record type:        New Gapcoin record

length:        8276
old merit:        1.442695
old start:        2
new merit:        23.343315
new start:        9379607991713767689037752451058095334299573442038275194082568313372670835315112 884015755655310313490453940577727861586651093627060654382771030228087943823
record type:        New Gapcoin record

length:        8290
old merit:        1.442695
old start:        2
new merit:        23.401422
new start:        7074173894939633835307114155247734161801064145891865592669174134662433167141668 039683578300544302824944203154890966861133941507092817024264747660686941143
record type:        New Gapcoin record

length:        8342
old merit:        1.442695
old start:        2
new merit:        23.518109
new start:        1113259366154491147298405549097271598997842815134419012786469988770852619514030 8103128494446902254904760407296838048927221124983502474242378555170508707681
record type:        New Gapcoin record

length:        8668
old merit:        1.442695
old start:        2
new merit:        24.435804
new start:        1135732278148557061539763702845062937715495823128593820831951039467055036244579 7663167037710377785805557794469793976793087553545082281102868926963565071319
record type:        New Gapcoin record

length:        8778
old merit:        1.442695
old start:        2
new merit:        24.773868
new start:        7609924160596013327416518477752676804001611700778926198312997796394143042500065 720503577172814748426251377430091319911728251004341125433831018019407064713
record type:        New Gapcoin record
AdamWhite
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March 29, 2015, 01:05:49 PM
 #1110

Well, what a shitcoin this turned out to be

Dev that couldn't give less of a fuck and private GPU miners dumping at any price

Fuck yeah  Roll Eyes
muchoman
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March 30, 2015, 02:36:52 PM
 #1111

Too much nearly dead coins on this forum.
qqqq
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April 01, 2015, 02:40:43 PM
 #1112

http://coinia.net/gapcoin/blockexplorer.php - Gap calculator is gone ?
pdazzl
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April 01, 2015, 03:35:23 PM
 #1113


All of coinia.net appears down.  Not that it matters at the moment, it seems like the price is wanting to approach zero.
ph4nt0m
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April 01, 2015, 05:38:04 PM
 #1114


All of coinia.net appears down.  Not that it matters at the moment, it seems like the price is wanting to approach zero.

No surprise with the dev last active half a month ago. Could be a not bad coin if managed properly.
sparkster
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April 01, 2015, 08:23:12 PM
 #1115

Such panic. Wow.
enerbyte
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April 04, 2015, 05:54:44 AM
 #1116

nothing new here?
Gap is dying
pdazzl
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April 04, 2015, 02:30:04 PM
 #1117

nothing new here?
Gap is dying

I'm staying to set some more world records, my guess is that's the motivation for most others still here.
enerbyte
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April 07, 2015, 05:48:21 PM
 #1118

nothing new here?
Gap is dying

I'm staying to set some more world records, my guess is that's the motivation for most others still here.


+1

I also continue to mining but it is sad to see how the price drops.
pdazzl
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April 07, 2015, 10:17:20 PM
 #1119

nothing new here?
Gap is dying

I'm staying to set some more world records, my guess is that's the motivation for most others still here.


+1

I also continue to mining but it is sad to see how the price drops.

Is someone using antminer or asics to mine this now?  There's two big pps users in the pool, could explain the price going down perhaps.
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April 09, 2015, 03:57:15 AM
 #1120

Market cap $500. Hell yeah...
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