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-   -   AMD or Intel (https://www.mersenneforum.org/showthread.php?t=12378)

mack 2009-09-02 22:03

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?

fivemack 2009-09-03 12:32

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 18-million range, a 2.4GHz Athlon X2 would take 0.17 seconds for numbers in the 60-million 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.

[url]http://www.mersenne.org/report_benchmarks/[/url]

lfm 2009-09-03 14:58

[QUOTE=fivemack;188511]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.

[url]http://www.mersenne.org/report_benchmarks/[/url][/QUOTE]

True but on chips of the same PRICE it seems AMD has a slight edge in some cases.

mack 2009-09-04 19:58

how can I find the exponent i am working on?

Uncwilly 2009-09-05 17:01

[QUOTE=mack;188666]how can I find the exponent i am working on?[/QUOTE]
Open Prime95 (it should be a little green box in the Systray), and in the worker winodws it will say what exponent it is working on. It says what type of test and how far along it is.

Reed_Young 2009-09-11 05:36

And in Linux?
 
[QUOTE=Uncwilly;188731]Open Prime95 (it should be a little green box in the Systray), and in the worker winodws it will say what exponent it is working on. It says what type of test and how far along it is.[/QUOTE]

In my GIMPS directory, I see results.txt. Do you mind helping me interpret the last line of it? I'm not as interested in the % progress, stage 1 or 2, iteration # on the leading lines. I just want to know about:

"M41674859 completed P-1, B1=455000, B2=7962500"

The M# I think I get :) but what are B1 & B2? Thank you.

Reed Young

cheesehead 2009-09-12 17:51

[quote=Reed_Young;189423]In my GIMPS directory, I see results.txt. Do you mind helping me interpret the last line of it? I'm not as interested in the % progress, stage 1 or 2, iteration # on the leading lines. I just want to know about:

"M41674859 completed P-1, B1=455000, B2=7962500"

The M# I think I get :) but what are B1 & B2? Thank you.

Reed Young[/quote]In the P-1 factoring method, B1 and B2 are two parameters that specify how far to go in stage 1 and stage 2, respectively.

[URL]http://mersennewiki.org/index.php/P-1_Factorization_Method[/URL] explains how the B1 and B2 values fit into the P-1 algorithm.

Reed_Young 2009-09-13 01:48

Thank you again, cheesehead. The wiki looks great.


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