20100714, 16:00  #1 
5×311 Posts 
Still modern?
Does it still make sense to do work in/for prime95? Or is it already too old, so the prime numbers in that are given out are already too small for a World Record/the program is slow compared to other newer ones....?
Just wanting to know if it still makes sense... ( I of course went as assignment for a World Record one on my 2.4 GHZ Dual Core (but jsut use one worker so I can do other stuff while the computer runs)...if I calculated it right the 49 Million Iterations will take me about 2 month?!?!, is that correct,does it make sense that I do it or should I rather do smaller assignments or nothing at all? Demondog11 
20100714, 17:58  #2 
4,451 Posts 
Also I heard I could get both of my Cores working on the same problem (number), how exactly do I do this? (I don't have a lot of knowledge about computers/mathmatics)

20100714, 18:07  #3 
BB_{16} Posts 
Sry for all my added stuff ;):
I figured out how to run multiple cores on one numbernwo, the problem I have right now is: It automatically selects the one I had on my first core before (Worker 1). Is there a way, I can have it to use both cores on my second worker? 
20100714, 18:59  #4  
"Nathan"
Jul 2008
Maryland, USA
10001011011_{2} Posts 
Welcome to GIMPS!
Just FYI, the project that you are working for is called GIMPS, which stands for "Great Internet Mersenne Prime Search". Prime95 is simply a program that allows you (your computer) to complete and contribute units of work (e.g. trial factoring, LL tests, etc.) to the GIMPS project. So it is more correct to say that you're working on GIMPS, rather than working on Prime95.
Quote:
The current world record prime is 2^43,112,6091, found by GIMPS in April 2009 (see mersenne.org for more information). There is no proof (yet) that infinitely many Mersenne primes should exist, but it "makes sense" that there could be. So if you're looking to set a world record, you would need to test numbers of the form 2^p1 for p > 43,112,609. You can accomplish this by choosing to receive the worktype "World Record Tests" in your Prime95 client. In fact, even if you select "First Time LL", there is a good chance you will receive an exponent big enough for a world record, should it be returned prime. In summary, Prime95 is as new and as stateoftheart as you could ever hope to get, and there is no danger of running out of world record test candidates probably within the lifetime of anybody currently alive! Quote:
Quote:
Quote:
If you don't fancy the idea of waiting so long for the LL test to complete, there are many other shorter assignment types available (none of which, unfortunately, would enable you to possibly find a new Mersenne prime). Trial factoring assignments take from mere minutes to hours, and doublechecking assignments (which are desperately needed right now  see some of the other threads) take only a couple of weeks or so. P1 factoring, which seeks to eliminate candidate Mersenne numbers with relatively small factors, is another good choice, if you have a decent amount of available RAM. P1 assignments take from 2472 hours or so. You have a nice machine and an interest in the project, which are the two most important things to get started. Try different worktypes out and see what interests you the most. Eventually you'll even get used to waiting for an LL test to finish  a couple of months goes by faster than you might expect  and once you finish your first test, it's easy to be hooked! Welcome to GIMPS, and please don't hesitate to ask questions here on the forum, if we can be of any more help. Your contributions to the project are definitely appreciated! 

20100714, 19:22  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2^{3}·7·167 Posts 
Thanks for posting that. I didn't have the time to do the long explanation. Yours is great.

20100715, 09:32  #6  
"Nathan"
Jul 2008
Maryland, USA
2133_{8} Posts 
Quote:
(1) Run one exponent on each core (this is actually the most efficient way to do things) (2) Pick a single exponent and let both cores work on it (this will get the test done faster, but it will not be exactly twice as fast, due to the fact that the computation of an LL test cannot be completely parallelized) (3) If you choose option (2), you will need to decide whether or not you wish to keep the second exponent that you were assigned. If you don't want to keep it, you can unreserve the exponent from your GIMPS account assignments page. On the other hand, you could just keep the other assignment in your worktodo file to start on once your first assignment finishes. There is no way, however, to use both cores to test your first exponent, while simultaneously using both cores to test your second exponent. You can't have your cake and eat it too... 

20100715, 18:22  #7  
Just call me Henry
"David"
Sep 2007
Cambridge (GMT/BST)
2×2,909 Posts 
Quote:


20100715, 19:36  #8 
Nov 2008
4422_{8} Posts 

20100716, 03:50  #9 
Oct 2008
n00bville
5^{2}×29 Posts 

20100717, 08:51  #10 
7·727 Posts 
thanks a lot for the replies it helped me a lot! :)
I now was running 2 Cores on one problem, without any problems (both running at 100% speed), but when I changed, the type of assignment they where supposed to do they both just run at 50% (as if there would be 1 core on 100%). I read the Thread about that in the FAQ but it didn't help me :S. It definately is running just on 50% and it doesn't just display it as such (since the Temp is far from maximum). Is there a way to fix this? 
20100717, 09:08  #11  
2·5·761 Posts 
Quote:
How would I unreserve exponents? Thanks for all your answers, as you can see I'm not a computer (or math) guy... Demondog11 P.s.: English also isn't my native tongue, therefore I want to apology for all the misunderstandings caused by my writing ;) 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Modern parameter choice for large 14e/small 15e projects  VBCurtis  Factoring  29  20160212 20:45 
Modern C  Dubslow  Programming  15  20160112 09:13 
Modern Foreign Languages in schools  f1pokerspeed  Soap Box  10  20131228 16:27 
Chance to use modern Graphics Cards as..  Marco  Hardware  28  20031102 23:21 