Topic: [ANN][GAP] Gapcoin - Prime Gap Search - New Math Algo - CPU / GPU - Zero Premine - page 67. (Read 287762 times)

Folks who are transitioning to solo mining now that the pool is closed, don't forget to get the new Chinese remainder theorem miner (rev5).

If all the pool users transitioned to solo in the shift 500-600 range I'll bet we could find the overall merit world record fairly quickly.  Seems easier to find bigger merits in the higher ranges.

What OS? Here is a guide: http://gapcoin.grn.cc/  Just skip the part about VPS... Generally speaking you download the qt, you run it and it downloads the blockchain, you download the latest miner, you start the miner pointing at the daemon...


Well it doesnt have the wow such coin much profit advertisement the other shitcoin have...


I had an idea lately. Let us select a random day in a month or so from now and call it "Gapcoin BreakTheRecordDay" (rename it however you like it). The idea will be that on that day we are calling miners from other coins too help us break the world record. Just a day trying... Then we spam(well some positive spamming, not too ugly) a bit the forums and social media and ask for help specific for that day. We could try to contact some crypto related news sites too. We gonna need someone to build a nice pool that can accept that traffic. Maybe we can talk with someone well known about this.  Someone should make a few images about that event. Finally we throw all the bounties that we have already gathered, plus we put a few more. I can add a few thousand gapcoins plus a few monero. The bounty will be given to whoever break the record. If a pool breaks the record i guess it can give according to shares of the spcific block. I believe we can gather a nice big bounty that can persuade people to mine gapcoin for a day. I dont know if we can succeed to break the record in a day. But a try wont be bad.

What are your thoughts? I am not sure about the technicalities. For example maybe we are going to fork the coin or whatever. But i dont think that anyone would like to destroy the coin...

Share your thoughts. If you find the idea okay lets start discussing for a few days. And then start organising it. Keep in mind that the whole thing shouldnt be utopically perfect. At least we can give it a try...

Its too bad this coin ends up like this when it offers so much more than 99% of the coins out there.

can you tell us how to do it?

Well whenever i mine gapcoin i solo mine so... It is actually very easy to solo mine gapcoin....

probably not

gap.nonce-pool.com shuts down in 4 days. Anyone cares?

Doing some more performance testing, here's another one that appears to yield good results if someone wants to try it out.

./gapminer-cpu -o 127.0.0.1 -p 31397 -u **** -x **** -t 8 --shift 508 --crt crt/crt-22m-512s.txt --fermat-threads 7 --sieve-primes 10000

It's a very low number of primes to sieve with but results in generating a LOT of candidate gaps in the gaplist.  The gaplist grows by 50000 every 10 seconds.  But the block percentage goes up very quickly.  The reason I think it does is because of j0nn9's algo picking the best candidate gaps from a bigger applicant pool in the heap and thus yielding block solving gaps more quickly.

You'll want to monitor your memory usage for a couple rounds at first, the high watermark for the above arguments on my machine is about 2.6gig of RAM so you'll want to make sure you're not too close to maxing out your memory.

Looks like they've posted on trnicely.net

Will see if we can get in the 25000 range next time

Also looks like some records show up again as improvements on themselves (on gapcoin.org) due to digits truncated on trnicely.net
EDIT: Fixed

Hi there,

just want to inform you that I submitted the current gap records from http://gapcoin.org/primegaps-length.php to Dr. Nicely.
I'll update gapcoin.org as soon as the new records are listed on http://www.trnicely.net/.

Looks like someone else has joined in searching for big shifts, we're setting new records fairly quickly now.

Almost got into the 25000 range this morning, length 24822 ( merit 28.8 ).  The overall merit record may be found more easily in these higher ranges.
https://bchain.info/GAP/block/126548

Gapcoin's first record in the 20000-24998 range, shift 920
https://bchain.info/GAP/block/125746

@j0nn9 - Is it possible to get 20000-24998 added to the gapcoin.org record range?
EDIT: Nevermind, looks like it works!

Also for anyone interested in hunting for larger overall length gaps, here are some settings that have worked for me (your mileage may vary).  As time goes on I'm starting to think in some ways larger shifts can be tuned for larger performance (notice I set the fermat thread to total thread ratio very high on these).

Shift 702 on an i7 (8 cores)
./gapminer-cpu -o 127.0.0.1 -p 31397 -u ***** -x ***** -t 7 --shift 702 --crt crt/crt-22m-704s.txt --fermat-threads 5 --sieve-primes 450000

Shift 920 on a 4 xeon server (16 cores)
./gapminer-cpu -o 127.0.0.1 -p 31397 -u ***** -x ***** -t 18 --shift 920 --crt crt/crt-22m-928s.txt --fermat-threads 15 --sieve-primes 300000

Thanks for pointing that out!

It was a database error on gapcoin.org. For the gap start and end there were only 256 Digits available, so that the last (decimal) digits of the number weren't saved.
bchain.info is propably suffering from a similar issue.

The database is currently recreated, gapcoin.org should be fixed within a few hours.

Thanks!

Gapcoin's first record in the 15000-19998 range with a shift 700
https://bchain.info/GAP/block/125025

@j0nn9 - Looks like gapcoin.org thinks shift 700 is shift 594?  Also, curious if there are any plans for a CRT on GPU?  My machine with faster RAM seems to have gotten a better benefit to this new algo, would be interesting to see how a GPU would handle it.


Edit: Looks like the shift 700 blew the doors off the bchain.info calculator, it concatenated some of the last digits on the start number.  Calculating by hand the two ends are primes per factordb.

My mistake, wrong branch. Links are fixed.
Also POW is submodule which must be downloaded separately:
https://github.com/gapcoin/Gapcoin-PoWCore/archive/master.zip


You can also use git:

Hi j0nn9,
In crt-rev5.zip I can only find the original source code (minus the POW) from October last year. Did you mix up some batches of code? (or am I doing something wrong?)

I second that, kudos to j0nn9.


Here are my thoughts from initially testing out the new crt miner.  What I think is my ideal performance setup is setting roughly half the total threads to Fermat threads.  My sieve-primes # is what I then fine tune on a particular shift size(near the end of fine tuning only adjusting 1000 on sieve-primes at a time then re-running for a minute to observe).  The ideal behavior is the gaplist size generally(most of the time) stays above 100.  It'll creep up to a 2000-3000 then oscillate back down to 100 and then continues in this see-saw fashion.  The Fermat test speeds seem to kick in faster when the list grows and tamps down the list.

Those are my findings after only 24 hours.  Two shift 512's so far.  I parked my beefier server on shift 1024 for most of the day but gave up after the probability reached 170% with no solved block.

@j0nn9 thanks for the new gapminer.

Got my first big CRT block, a record too.  Shift 512, length 13306.  On these really big shifts, a much higher overall Fermat thread ratio appears to yield better results.

https://bchain.info/GAP/block/cca2fe349c7c75098a0fba31139260e6b64f055a6e34e8b564f9070b9d0aec1c

@j0nn9 - You may need to add at least the 20k-25k record check list on gapcoin.org.  That's easily reachable on shift 1024.