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Author Topic: [XPM] [ANN] Primecoin Release - First Scientific Computing Cryptocurrency  (Read 686992 times)
bcp19
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August 01, 2013, 10:54:33 AM
 #2841

I'm not a mathemetician but my understanding is that

A) There's essentially an unlimited number of primes. Even when youre talking numbers hundreds of digits long, yoiu'll still find primes in them pretty regularly (every couple hundred digits or so).

B) Primecoin isn't even trying to find the biggest primes out there - indeed if it was and did, Sonny would qualify for some pretty big reward money

I have a feeling that the biggest primes are safe since the top 10 are all Mersenne Primes found by GIMPS.  Primecoin has helped find record Cunningham primes in the 120-160 digit length, GIMPS' record is something like 17 million digits.  The next reward from EFF is for a 100,000,000+ digit prime ($100,000) and a 1,000,000,000+ digit prime ($150,000).

I do not suffer fools gladly... "Captain!  We're surrounded!"
I embrace my inner Kool-Aid.
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August 01, 2013, 11:18:30 AM
 #2842

I'm not a mathemetician but my understanding is that

A) There's essentially an unlimited number of primes. Even when youre talking numbers hundreds of digits long, yoiu'll still find primes in them pretty regularly (every couple hundred digits or so).

B) Primecoin isn't even trying to find the biggest primes out there - indeed if it was and did, Sonny would qualify for some pretty big reward money

I have a feeling that the biggest primes are safe since the top 10 are all Mersenne Primes found by GIMPS.  Primecoin has helped find record Cunningham primes in the 120-160 digit length, GIMPS' record is something like 17 million digits.  The next reward from EFF is for a 100,000,000+ digit prime ($100,000) and a 1,000,000,000+ digit prime ($150,000).

means (2^332.xxx.xxx)-1 , to confirm that a number this large is prime with LL would need 2000 hours with a GTX Titan or 3400 hours with an 8-core CPU
now you have to see that the chance to find a Mersenne Prime in that range is 1 : 370000 (many candidates are proven composite with trialfactoring)
so normally it would need ~168.000 years for one person to find a 100,000,000+ digit prime, try your luck Wink
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August 01, 2013, 11:22:10 AM
 #2843

Primecoin isn't trying to find all primes, even small ones. It is looking for Cunningham chains (and, no, I don't know what they are either)

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August 01, 2013, 11:35:47 AM
 #2844

I'm not a mathemetician but my understanding is that

A) There's essentially an unlimited number of primes. Even when youre talking numbers hundreds of digits long, yoiu'll still find primes in them pretty regularly (every couple hundred digits or so).

B) Primecoin isn't even trying to find the biggest primes out there - indeed if it was and did, Sonny would qualify for some pretty big reward money

I have a feeling that the biggest primes are safe since the top 10 are all Mersenne Primes found by GIMPS.  Primecoin has helped find record Cunningham primes in the 120-160 digit length, GIMPS' record is something like 17 million digits.  The next reward from EFF is for a 100,000,000+ digit prime ($100,000) and a 1,000,000,000+ digit prime ($150,000).

means (2^332.xxx.xxx)-1 , to confirm that a number this large is prime with LL would need 2000 hours with a GTX Titan or 3400 hours with an 8-core CPU
now you have to see that the chance to find a Mersenne Prime in that range is 1 : 370000 (many candidates are proven composite with trialfactoring)
so normally it would need ~168.000 years for one person to find a 100,000,000+ digit prime, try your luck Wink
I used 2 cores of an i5 2500k on such a number and it took over 200 days to complete.  Using an 8 core CPU would be a huge power waste for very little speed gain.  The P95 program is very efficient, so memory bandwidth becomes an issue.  In addition, each iteration depends on the one prior, so parallelation is impossible.  IIRC, on my 2500k, using a single core would run at 144ms per iteration, 2 cores at 75ms, 3 cores at 60ms and all 4 core 55ms.  VERY inefficient with multiple cores.

I do not suffer fools gladly... "Captain!  We're surrounded!"
I embrace my inner Kool-Aid.
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August 01, 2013, 12:08:20 PM
 #2845

ypool is basically finding all the blocks at this point.
eule
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August 01, 2013, 12:10:07 PM
 #2846

I wish they'd release their code soon.  Cheesy

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August 01, 2013, 12:11:48 PM
 #2847

ypool is basically finding all the blocks at this point.

Just my luck. Was getting nothing soloing and then joined the pool and bam - found a block (92113). Should have just kept soloing a bit more  Grin

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August 01, 2013, 12:16:43 PM
 #2848

ypool is basically finding all the blocks at this point.

some friends and i still find blocks solo mining, everything is fine
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August 01, 2013, 12:48:04 PM
 #2849

http://cryptocoinexplorer2.com:5555/

I have put up a live alpha/beta of Explorer III.

This is a PrimeCoin Explorer.

-At this stage only the basic explorer is online, none of the extra features are active yet.

-Search function is not implemented yet, however the URL scheme is simple, and searching by hand quite easy.

-There are a couple of known bugs - for example the transactions on some blocks do not show correctly.

-Spent output field in the transaction page is not implemented yet

This is strictly a testing stage, so expect the explorer to be up and down as bugs are fixed and features are added.

Main CCE Explorer III update thread:
https://bitcointalk.org/index.php?topic=262539.0
saamxx
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August 01, 2013, 03:48:25 PM
 #2850

Where  i can download x86 xpm wallet?
The link on the OP - https://sourceforge.net/projects/primecoin/files/ -returned me Whoops....
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August 01, 2013, 04:07:55 PM
 #2851

I wish they'd release their code soon.  Cheesy

The source code is available on ypool's page, as well as the source code for the unofficial jhPrimeminer in a thread here on bitcointalk
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August 01, 2013, 04:26:38 PM
 #2852

Sourceforge project is missing for some reason, just filed a support request here:

https://sourceforge.net/p/forge/site-support/4918/
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August 01, 2013, 04:41:30 PM
 #2853

Where  i can download x86 xpm wallet?
The link on the OP - https://sourceforge.net/projects/primecoin/files/ -returned me Whoops....

The official download is down, thanks for reporting this. You can use mikael's high-performance build here:

https://bitcointalk.org/index.php?topic=255782.0
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August 01, 2013, 08:32:42 PM
 #2854

How does one compile this with CFLAGS? Is this right?:

Code:
make -f makefile.unix CFLAGS="-march=natice -O3"

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August 01, 2013, 09:01:32 PM
 #2855

-march=native

Whoops, thanks. But that code is correct once I fix the error?

Also, how does one enable hashespersec?  I looked here https://github.com/bitcoin/bitcoin/blob/master/src/bitcoinrpc.cpp but I can't seem it find much... It's for a different coin.

mikaelh
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August 01, 2013, 09:01:55 PM
 #2856

You should set CXXFLAGS like this:
Code:
make -f makefile.unix CXXFLAGS="-march=native -O3"
yourofl10
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August 01, 2013, 09:04:13 PM
 #2857

You should set CXXFLAGS like this:
Code:
make -f makefile.unix CXXFLAGS="-march=native -O3"

Ah thanks, I'll try that.  Smiley

Did you see my other question above by any chance?

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August 01, 2013, 09:09:58 PM
 #2858

Actually my usual line is CXXFLAGS="-O3 -march=native" BDB_LIB_SUFFIX=-4.8 BDB_INCLUDE_PATH=/usr/include/db4.8 make -f makefile.unix

Though you can probably pass environment variables to make the way you did.
I'm using CXXFLAGS because it's C++. To check it's working, look for the -O3 -march=native in the commands make outputs.

Here's what I got:
Code:
Building LevelDB ...
make[1]: Entering directory `/root/quark/src/leveldb'
g++ -march=native -O3 -I. -I./include -fno-builtin-memcmp -pthread -DOS_LINUX -D
LEVELDB_PLATFORM_POSIX -O2 -pthread -Wall -Wextra -Wformat -Wformat-security -Wn
o-unused-parameter -g -DBOOST_SPIRIT_THREADSAFE -D_FILE_OFFSET_BITS=64 -I/root/q
uark/src -I/root/quark/src/obj -DUSE_UPNP=0 -DUSE_IPV6=1 -I/root/quark/src/level
db/include -I/root/quark/src/leveldb/helpers -DHAVE_BUILD_INFO -fno-stack-protec
tor -fstack-protector-all -Wstack-protector -D_FORTIFY_SOURCE=2 -march=native -O
3 -c db/builder.cc -o db/builder.o
db/builder.cc:1:0: error: CPU you selected does not support x86-64 instruction s
et
make[1]: *** [db/builder.o] Error 1
make[1]: Leaving directory `/root/quark/src/leveldb'
make: *** [leveldb/libleveldb.a] Error 2

I'm trying to compile this on a different alt coin, and I remember a guide for Primecoin where you can compile it with these CFLAGS so I thought it would work on other other coin as well. Thanks for the help thus far.

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August 01, 2013, 09:14:56 PM
 #2859

I wish they'd release their code soon.  Cheesy

The source code is available on ypool's page, as well as the source code for the unofficial jhPrimeminer in a thread here on bitcointalk
Was talking about the pool code. I'd love a p2pool, if that's possible at all.

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August 01, 2013, 09:53:55 PM
 #2860

Interesting reads on this thread, it takes only forever to read everything  Cheesy

"The Times 03/Jan/2009 Chancellor on brink of second bailout for banks"
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