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Old 2008-10-14, 04:08   #1
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Default 100.000 digits numbers testand prime95 25.7

I´m checking the new prime95 25.7 beta version and I have seen that it is possible to check for 100.000 digit numbers test.

The time estimation are until 2021. So how does that work if after a year your lease will be released. How can I calculate one number on 4 cores (I have a quad core) or how can I share the calculation of one 100.000 digits number to several computers/cores (I have a quad core but it assigns to every thread another digit number)?
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Old 2008-10-14, 04:45   #2
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Quote:
Originally Posted by joblack View Post
I´m checking the new prime95 25.7 beta version and I have seen that it is possible to check for 100.000 digit numbers test.

The time estimation are until 2021. So how does that work if after a year your lease will be released. How can I calculate one number on 4 cores (I have a quad core) or how can I share the calculation of one 100.000 digits number to several computers/cores (I have a quad core but it assigns to every thread another digit number)?
All of the the exponents that generate numbers of one hundred thousand digits have all been checked and double checked.

If you are refering to exponents that will generate a number one hundred million (100,000,000) digits long, then yes it can test those. I would suggest that you test the machine and the software first, before attempting a 100M digit number. This should take ~1 to 2 months of work on the computer to verify that it is stable and returns results that are confirmed by others.

After that, yes you can have 4 cores work together on a single number. Look on this forum for threads with 25.4, 25.5, or 25.6 in the title. They will help you learn how to set the software.
No, you can't share the assignment among several computers at once.
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Old 2008-10-14, 05:38   #3
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If the testing would need several years (and not only 2 months) wouldn´t I fall out of the queue after a year? How will others try to crack these big numbers (32 cores?)?
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Old 2008-10-14, 05:42   #4
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No, as long as your computer makes regular updates to the server at least every 60 days, you won't lose the assignment.

But I don't recommend starting one now, at least not on a 4-core. It will take years and remember you only have about 1 in 3,000,000 probability that it will be prime.
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Old 2008-10-14, 10:45   #5
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Quote:
Originally Posted by joblack View Post
I´m checking the new prime95 25.7 beta version and I have seen that it is possible to check for 100.000 digit numbers test.

The time estimation are until 2021.
You mean 100 MILLION digits, don't you?
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Old 2008-10-14, 15:13   #6
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Yes 100,000,000 ...

By the way: is it planed to connect several computers and to calculate one number? Is it technical possible?
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Old 2008-10-14, 16:34   #7
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Quote:
Originally Posted by joblack View Post
Yes 100,000,000 ...

By the way: is it planed to connect several computers and to calculate one number? Is it technical possible?
Technically could you? Yes.
Would it be faster than on one computer? Absolutely not.
You can use several CPUs/cores within a computer, and it speeds it up, but slows down your overall throughput.
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Old 2008-10-15, 23:10   #8
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Quote:
Originally Posted by jrk View Post
No, as long as your computer makes regular updates to the server at least every 60 days, you won't lose the assignment.

But I don't recommend starting one now, at least not on a 4-core. It will take years and remember you only have about 1 in 3,000,000 probability that it will be prime.
What is with that expression: pnErrorDetail=WARNING: Estimated completion date is more than one year away. The assignment may be reassigned to another user after [Comm thread Oct 16 00:51] ==END== What does that mean exactly? Will it be cancelled after one year or may it be cancelled after a year. Are there some policies for that?

Last fiddled with by joblack on 2008-10-15 at 23:11
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Old 2008-10-16, 00:04   #9
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The v5 server reserves the right to reassign exponents that take longer than a year to complete. This won't happen for 100M exponents. The warning is for users that reserve small exponents that will take years to complete. In the past, we've been very, very tolerant of reservations that take several years to complete. The new policy tries to strike a better balance.
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Old 2010-06-24, 07:34   #10
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The v5 server reserves the right to reassign exponents that take longer than a year to complete. This won't happen for 100M exponents. The warning is for users that reserve small exponents that will take years to complete. In the past, we've been very, very tolerant of reservations that take several years to complete. The new policy tries to strike a better balance.
I switched from TF to LL and got M45365917 along with the one year warning message that the assignment may be reassigned to another user/machine after one year. It will take 5 days to reach the LL assignment. Question. If after the server decides to reassign the exponent one year from now, is the work performed by my machine discarded or is the state saved and transferred to the other user/machine? I'd like to do LL, but I'll unreserve the LL and go back to TF if the work is lost after the one year deadline.
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Old 2010-06-24, 13:33   #11
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Quote:
Originally Posted by scubabob View Post
If after the server decides to reassign the exponent one year from now, is the work performed by my machine discarded or is the state saved and transferred to the other user/machine? I'd like to do LL, but I'll unreserve the LL and go back to TF if the work is lost after the one year deadline.
Prime95 never sends intermediate work to the server. In your scenario, the server would accept both your results and the new user's results. If they match, then the number would be successfully double-checked.

That said, if you are starting your LL test in 5 days why do you think it won't complete within a year?
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