20110916, 20:08  #1 
Feb 2008
Bray, Ireland
139 Posts 
Type of work to get?
I look for prime numbers on my main PC. But I got this second laptop which I use only for travelling. Which means at times it is used a lot, but at other times it can be switched off for several months. Which is why I don't want to use it to find prime numbers.
What kind of work would be most suitable for such a machine? Trial factoring, p1 factoring (what's the difference between the two)? Double checking? Thanks, ZFR 
20110916, 21:05  #2 
Dec 2010
Monticello
3403_{8} Posts 
Let me rephrase your question, see if I have it right:
You want your laptop to get shorter assignments, so it can complete useful assignments in the short intervals you have it on, and not to have too much impact when you turn it off for a few months. CPUs are rapidly becoming very ineffective at TF, so I wouldn't bother. (GPUs are busy cleaning their clocks, outperforming them 10 to 100 to 1 at this job). TF(Trial Factoring) is a bruteforce exhaustive search for factors. P1 factoring assignments, on the other hand, take a few days apiece, and can use lots of memory (need at least 300M), and can't be done on GPUs, not yet. It's a much more elegant algorithm than TF, but it places certain requirements on the form of the factors it can find, but those factors can be larger than those that can be found by TF. ECM, especially with small amounts of memory, can also complete in a few days, but generally looks at smaller, knowncomposite Mersenne numbers. Doublechecking is useful, but will generally take between 2 weeks and a month to complete current assignments. This might be too big a chunk for you. You will want to use the "quit Gimps" option and let it finish the assignment before storing the machine if you want the results to be effective. I encourage you to visit http://www.mersenne.org/various/math.php and read up on the algorithms proper. 
20110916, 21:49  #3  
Feb 2008
Bray, Ireland
139 Posts 
Quote:
Just a question then. Will p1 factoring slow down my machine (assuming I leave the default priority)? If no, then I'll do p1 factoring. Otherwise I'll do double checking for the time being. It's going to be frequently on till end of November or so, after which I'll what's the best course of action. Last fiddled with by ZFR on 20110916 at 21:50 

20110916, 22:42  #4  
Jun 2003
7·167 Posts 
Quote:
Quote:
You should also be aware that any GIMPS work will "slow down" your machine by flattening its battery more quickly if you are not running on mains. Quote:


20110916, 22:47  #5 
"Forget I exist"
Jul 2009
Dumbassville
2^{6}×131 Posts 
or if it doesn't take too long to complete with restarting etc. just set prime 95 to start at login no ?

20110916, 22:49  #6  
Nov 2003
16444_{8} Posts 
Quote:


20110917, 01:21  #7 
Dec 2010
Monticello
11100000011_{2} Posts 

20110917, 08:43  #8 
Feb 2008
Bray, Ireland
139 Posts 
Thanks everyone for their suggestions. It will be on regularly for the next 2 months, so I'll continue with GIMPS for the time being, but as soon as its work becomes much less regular I'll probably switch to NFS@Home.

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