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Old 2011-06-07, 20:06   #1
Chuck
 
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Default 100M L-L time limit

Just for fun I requested a 100M digit L-L test for one of my three workers (using two CPU threads for each worker on a six-core I7-970. The estimated time to completion is greater than one year and a warning showed up in the communications window that the exponent coud be reassigned to another user after one year.

If I make continuous progress on this large exponent, is there really any danger that it could be reassigned? I wouldn't want to waste a year of processing time.

Chuck
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Old 2011-06-07, 22:36   #2
Prime95
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It will not be reassigned as long as your computer checks in at least once every 60 days or so.

I suggest timing a few thousand iterations to see if you have the stomach to wait for the result. It could be a few years.
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Old 2011-06-07, 22:49   #3
Chuck
 
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I did check the timing — it estimates 450 days with four threads working, so I think I will probably reduce the other two workers to one thread each and give this one four.

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Old 2011-06-08, 02:40   #4
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Hqve we done deep TF and P-1 on these 100M exponents?
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Old 2011-06-08, 03:16   #5
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Quote:
Originally Posted by Christenson View Post
Hqve we done deep TF and P-1 on these 100M exponents?
See http://mersenneforum.org/showthread.php?t=10693&page=12

I can't speak for Chuck's exponent, but yes, there has been TF and P-1 work done in that range. I did one of the P-1 tests: at the time that it finished back in April, it was the 97th exponent in the range to be P-1'd.
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Old 2011-06-08, 06:33   #6
davieddy
 
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Quote:
Originally Posted by Prime95 View Post
I suggest timing a few thousand iterations to see if you have the stomach to wait for the result. It could be a few years.
Also glance at the improbability of it being prime!

What is so special about base ten?*

...but if it floats your boat, Carry On Hunting.

David

*Ask Paul about Norfolk jokes.

Last fiddled with by davieddy on 2011-06-08 at 06:47
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Old 2011-06-08, 13:28   #7
Prime95
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Quote:
Originally Posted by Chuck View Post
I did check the timing — it estimates 450 days with four threads working, so I think I will probably reduce the other two workers to one thread each and give this one four.
Doublecheck those timings using the wall clock. The Test/Status dialog box is not great at estimating when using multi-threaded FFTs.
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