20090902, 22:03  #1 
Sep 2009
101_{2} Posts 
AMD or Intel
i have looked around on the forum and found that a p4 Intel from 2004 has a per iteration time of 0.02 something. my amd athlon x2 at 2.43 gHz has a per iteration time of 0.155? does this have something to do with hardware or software? or does it have something to do with the type of test?

20090903, 12:32  #2 
(loop (#_fork))
Feb 2006
Cambridge, England
14445_{8} Posts 
It depends on what size of exponent you're working on; a 3.2GHz P4 manages an iteration time of 0.029 for numbers in the 18million range, a 2.4GHz Athlon X2 would take 0.17 seconds for numbers in the 60million range.
The prime95 code happens to run a good deal faster for exponents of the same size on Intel than on AMD chips of the same GHz. http://www.mersenne.org/report_benchmarks/ 
20090903, 14:58  #3  
Jul 2006
Calgary
425_{10} Posts 
Quote:


20090904, 19:58  #4 
Sep 2009
5_{10} Posts 
how can I find the exponent i am working on?

20090905, 17:01  #5 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
97·103 Posts 

20090911, 05:36  #6  
Sep 2009
New Mexico
3×7 Posts 
And in Linux?
Quote:
"M41674859 completed P1, B1=455000, B2=7962500" The M# I think I get :) but what are B1 & B2? Thank you. Reed Young 

20090912, 17:51  #7  
"Richard B. Woods"
Aug 2002
Wisconsin USA
2^{2}·3·641 Posts 
Quote:
http://mersennewiki.org/index.php/P...ization_Method explains how the B1 and B2 values fit into the P1 algorithm. 

20090913, 01:48  #8 
Sep 2009
New Mexico
3×7 Posts 
Thank you again, cheesehead. The wiki looks great.

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