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Old 2007-03-22, 22:00   #1
TimSorbet
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Default Exponent Size Gap

I've checked the 10 million digit number only box since I started GIMPS and here's the exponents I've received:
M33983237
M34354007 (~370 thousand gap)
M34657633 (~300 thousand gap)
M35041399 (~380 thousand gap)
M35431117 (just under 400 thousand gap)
M38125771 (~2.7 million gap)
The 35431117 one didn't take any longer than the others, but the gap difference is over 2 million. Is this because now even people that don't have the 10 million only box checked are getting 10 million digit exponents, so the amount that get done between the ones I do is a lot more?
I know this is probably the reason...but I'm just wondering why the gap is so huge.
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Old 2007-03-23, 09:23   #2
tha
 
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Quote:
Originally Posted by Mini-Geek View Post
I know this is probably the reason...but I'm just wondering why the gap is so huge.

The reason you stated is indeed a major part of the answer to the question. Also, as exponents get reassigned after being abandoned, you can sometimes get an exponent that is smaller than the previous one you obtained. So, there is a lot of 'noise' in the assignments.
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Old 2007-03-23, 09:37   #3
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About 6 months ago the "leading edge" of first time assignments
passed the 10,000,000 digit point and jumped to exponents~35,500,000
or so. So since then, it has moved faster in the 10,000,000+ digit range.
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Old 2007-03-23, 12:25   #4
TimSorbet
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Quote:
Originally Posted by davieddy View Post
About 6 months ago the "leading edge" of first time assignments
passed the 10,000,000 digit point and jumped to exponents~35,500,000
or so. So since then, it has moved faster in the 10,000,000+ digit range.
It was at ~35,500,000? That explains it. For almost the entire time between those two, anybody getting an assignment on first-time or 10-million checked out a number between those two.
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Old 2007-03-23, 15:33   #5
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How long do you take to check an exponent?
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Old 2007-03-23, 16:47   #6
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It depends ... but I think the main factors are:
- Processor speed
- Allocated memory
- % of day you run Prime95

My 3.4Ghz takes about 28 days at the 35M range
My 2.4Ghz takes about 35 days at the 35M range
My now retired 400Mhz took 16 months at the 33M range
They both run nearly continuous.
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Old 2007-03-23, 17:30   #7
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Quote:
Originally Posted by petrw1 View Post
It depends ... but I think the main factors are:
- Processor speed
- Allocated memory
- % of day you run Prime95

My 3.4Ghz takes about 28 days at the 35M range
My 2.4Ghz takes about 35 days at the 35M range
My now retired 400Mhz took 16 months at the 33M range
They both run nearly continuous.
Mine's a 1533 Mhz Athlon XP with 140 MB allocated, and although I run it about 16 hours a day (the entire time I'm awake) for seven days a week, I use my computer and use it for some gaming.
I started the one I'm currently doing on August 14, 2006, didn't do TF, then finished the P-1 on August 24, 2006, and now it's going to finish the LL test today, March 23, 2007. That's a day under 7 months for the LL. The last one took two days over 7 months for the LL, so I'm pretty consistently 7 months for LL in the 35M range. That makes it equivalent to about 9.5 hours each day.

So, davieddy, the short answer is seven months.
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Old 2007-03-23, 18:34   #8
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THX when I said how long does it take "you" I was talking
to Minigeek, not the world in general.
Personally, I am doublechecking 17,059,159 and am 93% through.
Long shot to find a prime tho
Taken ~ 6months on a PII.

Last fiddled with by davieddy on 2007-03-23 at 18:37
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Old 2007-03-25, 07:29   #9
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All the exponents mentioned in the first post are exponents above the 10,000,000 digits range. But only part of the active GIMPS participants reserved exponents above the 10M digits range. (which is slightly above exponent 33,200,000) Now that we are out of first time LL assignments in the below 1)0M range all active participants reserve in the higher range most of the time. But even of more influence are the stress testing overclockers who reserve more than 50% of all assignments but never complete them. So the 'air bubble' that used to be in the below 10M range is now moving to the above 10M range. That explains most of the effect.
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