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Old 2009-01-22, 08:50   #1
hj47
 
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Default How much credit for LL?

Hey,

I've build my dedicated E5200 (stock clock) rig with 4 gigs of ram.

How long and how much GHz credit will I get to complete an LL test?

Also, is there a more efficient way of getting credit ie. does P-1 award more credit than LL, for example?

Cheers :D
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Old 2009-01-22, 11:24   #2
MatWur-S530113
 
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Hello,

if you run only for CPU-Credit you should do TF
The values of my computer are (E6600 at 2.4 GHz, always 1 worker):
1 day TF ~ 2.8 GHzDays
1 day LLT ~ 2.4 GHzDays
1 day P-1/ECM ~1.9 GHzDays

A LLT with exponent ~ 45e6 will need ~ 30 days and you will get ~ 80 GHzDays CPU-Credit.

Best regards,

Matthias
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Old 2009-01-22, 11:32   #3
hj47
 
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Hi,

do those values change if you use an AMD proc.? I P-1 factor on my Athlon X2, but if it's more efficient to do so I think I'll switch to TF.

Cheers
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Old 2009-01-22, 12:06   #4
MatWur-S530113
 
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Hello again,

yes, AMD's should have other ratios between these values. AMD's should be better for TF to low limit and less efficient for LLT/P-1/ECM and 'normal' TF.

Best regards,

Matthias
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Old 2009-01-22, 12:07   #5
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On an AMD, TF probably gives more credit. Definitely if it is a 64-bit processor and you are using a 64-bit OS. The best thing is to run a benchmark and then compare against the benchmark os a reference processor, i.e. any Core 2 Duo.
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Old 2009-01-22, 12:20   #6
hj47
 
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Quote:
Originally Posted by garo View Post
On an AMD, TF probably gives more credit. Definitely if it is a 64-bit processor and you are using a 64-bit OS. The best thing is to run a benchmark and then compare against the benchmark os a reference processor, i.e. any Core 2 Duo.
Hi, are we talking about a 5-15% increase or more like 2-3% on a 64bit OS?

Thanks
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Old 2009-01-22, 13:27   #7
Mini-Geek
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Quote:
Originally Posted by hj47 View Post
Hi, are we talking about a 5-15% increase or more like 2-3% on a 64bit OS?

Thanks
Running TF on a 64-bit OS is more like a 100% increase (i.e. double), unless I'm mistaken. Other types of work (LL/DC anyway, not sure about P-1) have little to no difference running on 64-bit OS vs 32-bit OS. Also, Athlons are better at TF than Intel, but Intel is better at LL than Athlons, so probably the way to get the most inflated GHz days credit is to run TF on an Athlon with a 64-bit OS.
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Old 2009-01-22, 14:01   #8
R.D. Silverman
 
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Quote:
Originally Posted by hj47 View Post
Hey,

I've build my dedicated E5200 (stock clock) rig with 4 gigs of ram.

How long and how much GHz credit will I get to complete an LL test?

Also, is there a more efficient way of getting credit ie. does P-1 award more credit than LL, for example?

Cheers :D
If you are doing this for "credit", then you are doing it for the wrong reasons.
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Old 2009-01-22, 14:15   #9
MatWur-S530113
 
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Quote:
Originally Posted by R.D. Silverman View Post
If you are doing this for "credit", then you are doing it for the wrong reasons.
For mathematical reasons you may be right. But for GIMPS' reason I would say:
better do it for 'credit' than do nothing

best regards,

Matthias
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Old 2009-01-22, 14:17   #10
Uncwilly
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Quote:
Originally Posted by R.D. Silverman View Post
If you are doing this for "credit", then you are doing it for the wrong reasons.
In Dr. Silverman's opinion.
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Old 2009-01-22, 14:29   #11
R.D. Silverman
 
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Quote:
Originally Posted by Uncwilly View Post
In Dr. Silverman's opinion.
One can participate in GIMPS

(1) For fun.
(2) To help advance the art.
(3) Because one is interested in number theory.
(4) Because one wants to learn the algorithms.

But for "credit"??? The credit goes to George and all those who gave
their coding help, theoretical help, and time to make the project a reality.

But I have still never seen a cogent explanation for why anyone deserves
"credit" for mindlessly downloading then running software developed by
others. I think "credit" for merely supplying CPU time is silly. One
might be given recognition for participating, but giving "more" credit
to people simply for providing "more" cpu time shows a screwed up sense
of values, IMO. Why should a someone at a university with 100's of
computers (that they did not buy!!!) deserve "more" credit than someone
who bought his own single PC???
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