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View Poll Results: Will Any Current 100M Digit LL Tests Finish?
Yes 34 73.91%
No 12 26.09%
Voters: 46. You may not vote on this poll

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Old 2008-11-27, 05:17   #1
jinydu
 
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Default Will Any Current 100M Digit LL Tests Finish?

That is, will any already registered LL tests above 100M digits actually finish?
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Old 2008-11-27, 06:10   #2
S485122
 
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My vote : possibly or perhaps.

Jacob
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Old 2008-11-27, 13:09   #3
Mini-Geek
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"Tim Sorbera"
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There's 483 >100M digit LLs currently assigned (478 just over the limit and 5 more spread out farther). I think that out of that many computers one of them is bound to finish eventually.

Last fiddled with by Mini-Geek on 2008-11-27 at 13:09
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Old 2008-11-27, 22:36   #4
petrw1
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"Wayne"
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I already votes YES ... however ... is anyone privy to knowing if any of these assignments are on BIG Hardware. Otherwise we may not live long enough to verify or even remember this poll. As far as I know there is no longer a list of all current assignments.
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Old 2008-11-27, 23:59   #5
jinydu
 
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I don't know whether any serious hardware is being devoted to these tests. And the lack of public data on whether or not any actual iterations have been done doesn't help either...

Just to be clear, I set the poll expiration date for Dec. 31. So I'm only asking 100M digit tests that were reserved on or before 2008. Evidently, we expect a 100M digit test to finish some day.
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Old 2008-11-28, 14:40   #6
henryzz
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does anyone have a time estimate on a Q6600 for a 100M digit test
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Old 2008-11-28, 19:19   #7
jinydu
 
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You can get an estimate by opening the Advanced menu on Prime95 and clicking Time...
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Old 2008-11-28, 20:02   #8
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You wanna have a go? You wanna take a risk? You wanna be disappointed after waiting for ages? I wouldn't do that many if I were you.
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Old 2008-11-28, 21:34   #9
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As I recall from recent testing, a 10M-digit test at GIMPS take ~20 days to test on a modern machine. Is that correct?

If so, I have a question: Wouldn't a 100M-digit test take ~20 days*10^2=~2000 days or ~5.5 years to complete?

Based on that, this statement makes no sense:

Quote:
Otherwise we may not live long enough to verify or even remember this poll.
I suppose it makes sense if you're > 90 years old. lol Otherwise, why is it unrealistic that someone somewhere would leave some machine running for 5-6 years in a back room somewhere, just forget about it for days at a time, and simply check it once/week to make sure it is still running and progressing?

My response is an emphatic YES, of course someone will complete a 100M-digit test. I'm not sure why there is even a debate about whether it will happen. And this doesn't take into account increases in computer speeds in the future.

Am I missing something here? Is there some reason to think that the testing time will vary more than by the square of the exponent?

Edit: I have a better idea for a poll: Will someone complete a 1-billion digit test in the next 30-50 years? Now, there is something that is open to debate about the capacity of Prime95, LLR, computer's memory, future increases in computer speeds, future individuals dedication to actually attempting such a feat, etc.


Gary

Last fiddled with by gd_barnes on 2008-11-28 at 21:39
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Old 2008-11-28, 21:41   #10
petrw1
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Quote:
Originally Posted by jinydu View Post
You can get an estimate by opening the Advanced menu on Prime95 and clicking Time...
Using Time... on a:

Code:
Model Intel(R) Pentium(R) 4 CPU 3.40GHz 
Features Single core, 2 hyperthreaded CPUs, Prefetch,SSE,SSE2 
Speed 3.391 GHz (3.533 GHz P4 effective equivalent) 
L1/L2 Cache 16 / 1024 KB 
Computer Memory 1016 MB   configured usage 200 MB day / 200 MB night
I guess at the exponent to be 100M. I might be a little off.

Code:
[Nov 28 15:34] Setting affinity to run helper thread 1 on logical CPUs 0,1
[Nov 28 15:34] Using FFT length 20M, 2 threads
[Nov 28 15:35] p: 332190991.  Time: 885.703 ms.
[Nov 28 15:35] p: 332190991.  Time: 879.040 ms.
[Nov 28 15:35] p: 332190991.  Time: 877.096 ms.
[Nov 28 15:35] p: 332190991.  Time: 884.255 ms.
[Nov 28 15:35] p: 332190991.  Time: 885.846 ms.
[Nov 28 15:35] p: 332190991.  Time: 874.900 ms.
[Nov 28 15:35] p: 332190991.  Time: 877.598 ms.
[Nov 28 15:35] p: 332190991.  Time: 884.331 ms.
[Nov 28 15:35] p: 332190991.  Time: 874.370 ms.
[Nov 28 15:35] p: 332190991.  Time: 877.754 ms.
[Nov 28 15:35] Iterations: 10.  Total time: 8.801 sec.
[Nov 28 15:35] Estimated time to complete this exponent: 3383 days, 18 hours, 28 minutes.
Seems like a rather large FFT=20M.
Over 9 years.

P.S. I did my first 10M on a pIII 400Mhz and it only took 15 months.

Last fiddled with by petrw1 on 2008-11-28 at 21:42
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Old 2008-11-28, 22:21   #11
James Heinrich
 
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"James Heinrich"
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Quote:
Originally Posted by henryzz View Post
does anyone have a time estimate on a Q6600 for a 100M digit test
Depends on how fast you have it clocked
At 3.4GHz it (estimates it will take) about 4.5 years (with 4 threads running on 800MHz RAM). So somewhere between 4 and 6 years, depending on the exact hardware.

As it relates to this thread, I will not be finishing my assigned LL test, I'm just running through TF and P-1 (ETA: end of Jan 2009).
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