20030311, 18:10  #1 
Aug 2002
2·3·29 Posts 
Factoring so slow??
I am going to run a LLtest of M33395827. However after 2 days of factoring (around 50 hours up to now, 8085% cpu time  I am guessing here) prime still havent start to actual LL test. It has completed the initial trial factoring to 2^68 and currently its doing some 'Stage 1' thing and at around 65%.
The computer is a P4 2.4@3.1 with 2GB RAM, 1GB given to prime. Is there something wrong or am I just being too impatient? 
20030311, 18:39  #2 
Aug 2002
Termonfeckin, IE
2^{2}·691 Posts 
Nothing's wrong. It takes about 2 days to do trial factoring to 68 bits and currently your machine is doing a P1 test which goes in two stages. The LL test should start in another day or so  if P1 does not find a factor.

20030311, 18:47  #3 
"GIMFS"
Sep 2002
Oeiras, Portugal
1,493 Posts 
And also, as you have given 1GB to prime95, it can be anticipated a long time waiting for Stage 2 of P1 to finish. The good point is that the chances of finding a factor are higher.

20030311, 19:34  #4 
Aug 2002
2×101 Posts 
And if you find a factor, you have just eliminated a very expensive LL test (and the doublecheck!). This means you can move on more quickly to an exponent that just might yield that whopper of a prize.

20030311, 19:47  #5 
Aug 2002
2·3·29 Posts 
Thanks for the response :)
Previously I have only been running Double checking on this system as it only takes a few days per test on those. Now I might want to give LL test ago see how things are :) 
20030311, 23:06  #6  
"GIMFS"
Sep 2002
Oeiras, Portugal
1,493 Posts 
Quote:


20030312, 04:44  #7  
Aug 2002
2×3×29 Posts 
Quote:


20030313, 04:12  #8 
Oct 2002
Lost in the hills of Iowa
2^{6}×7 Posts 
Which is a lot of the difference  the 33M+ range takes a lot longer, and the iteration time is also a lot slower.
Even on a P4. 9) 
Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Slow Down?  R.D. Silverman  GMPECM  55  20111016 17:28 
CPU is too slow for normal trial factoring  Aapje  PrimeNet  21  20090112 04:20 
How hot is too hot? Slow is too slow?  petrw1  Hardware  13  20081110 23:25 
Celeron 2.40 too slow?  rudi_m  Hardware  14  20051011 03:31 
Web server slow  HackMaster  PrimeNet  28  20050621 21:01 