Re: Mersenne: Re: Possible V20 issue
George Woltman wrote: Correct. However, if you do find a factor you will get credit. In fact you get credit for trial factoring up to the size of the factor. Umm.. I found some 30-digit factors with moderate bounds. Does that mean I'd get credit for trial-factoring up to 100 bits? Trial factoring that far would take many centuries, so the top producers list might soon be populated with lucky P-1 factorers, no? Ciao, Alex. _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Re: Possible V20 issue
From: George Woltman [EMAIL PROTECTED] To: "Nathan Russell" [EMAIL PROTECTED],[EMAIL PROTECTED] CC: [EMAIL PROTECTED] Subject: Re: Possible V20 issue Date: Mon, 20 Mar 2000 19:03:06 -0500 Hi, At 05:46 PM 3/20/00 -0500, Nathan Russell wrote: I have noticed that, when I finish the v20 P-1 of an exponent and send in the result, there is no "sending results" line but only a "sending text message" line. Does this mean I am not getting CPU time credit? Correct. However, if you do find a factor you will get credit. In fact you get credit for trial factoring up to the size of the factor. In the long run, you will end up with more time credited than you actually invested. In the short run, it is like a CPU credit lottery. Scott does not have the free time to accurately credit P-1 factoring. However, it affects every one and is less than a 1.5% impact on your totals. Regards, George George, Thanks for straightening this out for me. The eight hours twice a month of P-1 factoring will make a very small dent in my standing - certainly much less than my prior (to this week) practice of turning my machine off at night (I was not used to leaving the fan on). Another potential issue that just occured to me: If someone has an exponent partially done under version 19.x or 18.x and upgrades and it finds a factor, will they get more credit for the factor than they lost for the partial LL run? This is something that might be a significant issue for those who are running P-100's and comperable machines, where it would be a loss of months rather than weeks. If this has already been thought through, I still feel that it would be good for the list to be aware of that fact. Best regards, Nathan __ Get Your Private, Free Email at http://www.hotmail.com _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Re: Possible V20 issue
At 08:14 PM 3/20/2000 EST, you ("Nathan Russell"
[EMAIL PROTECTED])wrote:
Another potential issue that just occured to me:
If someone has an exponent partially done under version 19.x or 18.x and
upgrades and it finds a factor, will they get more credit for the factor
than they lost for the partial LL run? This is something that might be a
significant issue for those who are running P-100's and comperable machines,
where it would be a loss of months rather than weeks. If this has already
been thought through, I still feel that it would be good for the list to be
aware of that fact.
Best regards,
Nathan
George has previously indicated that P-1 factoring is attempted, before
continuing on, if the LLtest in progress is less than 50% done, and
otherwise not. This is done as a total throughput optimization of GIMPS.
If the LLtest is more than 50% done, the LLtest continues.
But someone else may later P-1 factor the number and succeed in finding
the factor. Then all the time to LLtest is uncredited, as happens for all
LLtests,
whether prime95 V20, V14.1 or earlier, or some other program. (Watch
David Slowinski's cpu credit and number of exponents credited slowly
shrink, as
factoring gradually erodes his totals. Credit for dozens of my early tests
has
also been factored away.)
If the person with the LLtest in progress finds the factor, he gets the
factoring credit.
Ken
_
Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm
Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Re: Possible V20 issue
Hi, At 05:46 PM 3/20/00 -0500, Nathan Russell wrote: I have noticed that, when I finish the v20 P-1 of an exponent and send in the result, there is no "sending results" line but only a "sending text message" line. Does this mean I am not getting CPU time credit? Correct. However, if you do find a factor you will get credit. In fact you get credit for trial factoring up to the size of the factor. In the long run, you will end up with more time credited than you actually invested. In the short run, it is like a CPU credit lottery. Scott does not have the free time to accurately credit P-1 factoring. However, it affects every one and is less than a 1.5% impact on your totals. Regards, George _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Re: Mersenne: Re: Possible V20 issue
Hi, At 08:28 PM 3/20/00 -0600, Ken Kriesel wrote: If someone has an exponent partially done under version 19.x or 18.x and upgrades and it finds a factor, will they get more credit for the factor than they lost for the partial LL run? I'm sure if you send an email to [EMAIL PROTECTED] with the exponent you were testing as well as what iteration you were on or your percent complete, then they will be glad to give you the CPU credit. But someone else may later P-1 factor the number and succeed in finding the factor. Then all the time to LLtest is uncredited, This happens in the stats at http://www.mersenne.org/top.htm but not the stats maintained by the primenet server. How's that for confusing! Regards, George _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
