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Search: Posts Made By: Greenbank
Forum: Hardware 2010-09-09, 14:12
Replies: 5
Views: 761
Posted By Greenbank
They have provided many a factor for your...

They have provided many a factor for your homogenous cunningham number tables too.
Forum: Hardware 2010-09-09, 13:56
Replies: 5
Views: 761
Posted By Greenbank
Oh yes, another downside (or not depending on how...

Oh yes, another downside (or not depending on how you see it).

A lot of that power gets turned into heat. Great in Winter, or if you have a cool basement/cellar that you'd like to warm up, not so...
Forum: Hardware 2010-09-09, 13:48
Replies: 5
Views: 761
Posted By Greenbank
For Sale: Two RLX 300ex Blade Servers (London, UK)

Just wondering if there would be any interest on here for these. If not I may try eBay-ing them with an appropriate reserve price.

I hope an advert is ok in this forum, please let me know if it...
Forum: Factoring 2010-08-26, 09:09
Replies: 19
Views: 2,517
Posted By Greenbank
N =...

N = 67265468438158925156029310985265926133792339483088426060945720579389614045244727695101069671293650665794246539609007915477818493

c =...
Forum: Factoring 2010-08-25, 20:14
Replies: 19
Views: 2,517
Posted By Greenbank
Excellent, will do that when I'm back at the...

Excellent, will do that when I'm back at the machine that has the factors (I got part way through a GMP program to calculate the numbers before realising I didn't have the factors to hand!)
Forum: Factoring 2010-08-24, 08:57
Replies: 19
Views: 2,517
Posted By Greenbank
Still waiting for a response to the questions in...

Still waiting for a response to the questions in order to post the factors.

Don't anyone else waste time factoring this number as it has already been done.

It raises an interesting theoretical...
Forum: Factoring 2010-08-16, 09:29
Replies: 19
Views: 2,517
Posted By Greenbank
OK, factored (I was bored and needed to soak test...

OK, factored (I was bored and needed to soak test a new blade server for a week; if it wasn't behind a firewall I would have given it some Homogenous Cunningham numbers to do...)

p64 x p65
...
Forum: GMP-ECM 2007-05-29, 12:31
Replies: 11
Views: 1,024
Posted By Greenbank
The web page is automatically generated by the...

The web page is automatically generated by the ecmnet server.

To change the information on that page you'll need C++ programming skills and a copy of the ecmnet (just stick "ecmnet" in google and...
Forum: GMP-ECM 2007-05-16, 13:51
Replies: 6
Views: 1,634
Posted By Greenbank
But what about a case such as 123012031 ? ...

But what about a case such as 123012031 ?

which is 4523 * 27197

Depending on the sigma I can discover either factor:-

GMP-ECM 6.1 [powered by GMP 4.1.4] [ECM]
Input number is 123012031 (9...
Forum: Prime Sierpinski Project 2007-05-15, 13:24
Replies: 51
Views: 4,497
Posted By Greenbank
For proth_sieve, ask the original author: Mikael...

For proth_sieve, ask the original author: Mikael Klasson, his email address (as given on his own web page) is: mklasson T acm.org
Forum: Factoring 2007-05-14, 16:59
Replies: 96
Views: 5,873
Posted By Greenbank
What about a script for Homogeneous Cunningham...

What about a script for Homogeneous Cunningham numbers (a^n +/- b^n) (i.e., takes a, b, n, known factors) and spits out an SNFS poly file?

I'm going to try and knock up my own based but someone...
Forum: Prime Sierpinski Project 2007-05-14, 16:56
Replies: 51
Views: 4,497
Posted By Greenbank
Shame I don't have any spare time at the moment!

Shame I don't have any spare time at the moment!
Forum: Prime Sierpinski Project 2007-04-18, 10:44
Replies: 17
Views: 2,057
Posted By Greenbank
Great work Geoff. I'm beginning to wonder if...

Great work Geoff.

I'm beginning to wonder if SPH really is worth the trouble it is. I wrote a whole load of stuff about sieving (Riesel/Sierpinski, DL problem, BSGS and SPH) over at the SoB forum:...
Forum: Sierpinski/Riesel Base 5 2007-03-14, 18:57
Replies: 172
Views: 8,231
Posted By Greenbank
Yes, Linux man pages for sysctl() do warn you...

Yes, Linux man pages for sysctl() do warn you away from using sysctl() in favour of scraping the info from text files in /proc.
Forum: Sierpinski/Riesel Base 5 2007-03-09, 15:37
Replies: 172
Views: 8,231
Posted By Greenbank
Must be compiled with -m64 Only tested on...

Must be compiled with -m64

Only tested on MacOS X on 64-bit PPC, not Linux (not sure if the sysctl interface is the same).

#include <stdio.h>
#include <stdint.h>
#include <sys/sysctl.h>
...
Forum: Sierpinski/Riesel Base 5 2007-03-09, 15:19
Replies: 172
Views: 8,231
Posted By Greenbank
MacOS X command line:- sysctl...

MacOS X command line:-

sysctl hw.l1icachesize
sysctl hw.l1dcachesize
sysctl hw.l2cachesize

So I'm guessing there'll be somewhere in the sysctl() function call...indeed, in...
Forum: Factoring 2007-03-06, 12:07
Replies: 13
Views: 1,233
Posted By Greenbank
I agree, in my hacked version of ecmnet I test...

I agree, in my hacked version of ecmnet I test for primality when adding the number to the server, not before each and every curve.

It may be ok if you're making ecm do multiple curves on the same...
Forum: Lounge 2007-03-02, 15:39
Replies: 6
Views: 427
Posted By Greenbank
Indeed the RLX Blade servers I picked up on eBay...

Indeed the RLX Blade servers I picked up on eBay came from Sanger (Wellcome Trust Institute) where they do lots of sequencing and analysis of the genome.

Finally got round to making them network...
Forum: Sierpinski/Riesel Base 5 2007-02-20, 12:00
Replies: 172
Views: 8,231
Posted By Greenbank
That looks great Geoff. I hope my message...

That looks great Geoff.

I hope my message didn't come over as "my sieve is faster than yours", it certainly wasn't meant that way.

If we work together and share code/results we can make each...
Forum: Sierpinski/Riesel Base 5 2007-02-16, 09:28
Replies: 172
Views: 8,231
Posted By Greenbank
Yes. 1 kp= 1000 p/s. So 612kp/sec could be...

Yes. 1 kp= 1000 p/s.

So 612kp/sec could be anything from 612000 p/sec to 612999 p/sec.

If you want it to report p/sec then remove the multiple of 0.001 on line 770 in proth_sieve.c and change...
Forum: Sierpinski/Riesel Base 5 2007-02-15, 12:59
Replies: 172
Views: 8,231
Posted By Greenbank
OK, sent you a couple of emails. I've found the...

OK, sent you a couple of emails. I've found the coredump problem in the lower ranges and so it's all good to go.

To compare sieving speeds of proth_sieve (for PPC 970 and Linux) I did a small...
Forum: Sierpinski/Riesel Base 5 2007-02-15, 11:42
Replies: 172
Views: 8,231
Posted By Greenbank
Sheep, back looking at this again after a bit of...

Sheep, back looking at this again after a bit of a busy time...
Forum: Octoproth Search 2007-02-14, 16:37
Replies: 1
Views: 5,025
Posted By Greenbank
History

Sorry, other things came up and I don't have time for this any more.

You can download zip files of my octo/dodeca/hexadeca-proth directories here:-

There may be all manner of rubbish in there,...
Forum: Factoring 2007-02-09, 10:37
Replies: 1,810
Views: 129,934
Posted By Greenbank
Got some free time to play with my factoring...

Got some free time to play with my factoring daemon code on the blade server and used the latest comps.gz file for a while.

3,2,403+ was a c160
p27 = 107785168849898377990351109 Method=ECM ...
Forum: Sierpinski/Riesel Base 5 2007-01-15, 13:13
Replies: 172
Views: 8,231
Posted By Greenbank
Just a note to say that I've finally had time to...

Just a note to say that I've finally had time to look at proth_sieve on PPC linux. Sheep has given me an account on a suitable machine and I'm trying to fix some strange issues at the moment (almost...
Showing results 1 to 25 of 386

 
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