Mersenne: Scientific American: Distributed Computing
Title: Mersenne: Scientific American: Distributed Computing The April edition of Scientific American has an article on distributed computing: http://www.sciam.com/2000/0400issue/0400scicit5.html -Shaun
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
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Mersenne: $1 Million For Proof Of Goldbach's Conjecture?
$1 million math challenge issued Publishers seek solution to prime-number conundrum ASSOCIATED PRESS LONDON , March 17 Two publishers are offering a million dollars to anyone who can prove that all even numbers are the sum of two prime numbers. No one has cracked the problem in the more than 250 years since it was first posed, and Fridays announcement indicated the publishers arent too worried about having to pay up. THE THEORY, known as Goldbachs Conjecture, was suggested by the Prussian mathematician Christian Goldbach in 1742. Its easy enough to think of an even number that is the sum of two prime numbers those which cannot be divided evenly by any number except themselves. For instance, 5 plus 7 equals 12, or 67 plus 3 equals 70. But so far it has been impossible to prove that it works for every imaginable even number. Faber and Faber, in conjunction with Bloomsbury Publishing in the United States, announced the challenge Friday to promote the coming release of Uncle Petros and Goldbachs Conjecture, by Apostolos Doxiadis. Proving it may well be impossible, the publishers said, and it is very probable that only a highly skilled mathematician would ever be able to produce a proof that meets the requirements of these rules. The publishers set a deadline of March 15, 2002. To claim the prize, the winner would have to have the solution accepted for publication by a reputable mathematical journal and then have the proof confirmed by at least four members of a six-judge panel appointed by Faber and Faber. However, you dont have to buy a copy of Uncle Petros to compete, the publishers said. By offering this challenge, neither Faber and Faber Limited nor Bloomsbury Publishing are representing or warranting that the validity of Goldbachs Conjecture is capable of proof in the general case, the publishers said. _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Possible V20 issue
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? This is no big issue - I am in GIMPS for the chance of making a discovery, not to make my way to the top of a list, and P-1 promises to speed the fulfillment of that goal, if not for me than for someone else. However, those who have other goals might be displeased when they notice that they are getting (very slightly) less credit than they expected. I feel that this is an issue that should be resolved before v 20 is offered as a public release, even in resolving it means just adding a line to the output so that others are not confused as I have been. Respectfully, Nathan Russell __ 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
Mersenne: IRC?
When I was in distributed.net, there was an official IRC channel in which people could ask questions and discuss the project much more rapidly than is possible on a mailing list. It has occured to me that this could be something positive for GIMPS. Dalnet and certain other networks allow maintaining control over a channel without someone needing to remain on it continously. As a newbie, I know that I have asked questions to which the answers were relatively basic, albeit not covered by the FAQ. If newbies were able to go to an IRC channel, they could get immediate responce to their questions, and more experienced participants could have their concerns addressed or debate issues without inconviencing those who have no immediate interest. Nathan Russell __ 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
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
Mersenne: V20 beta - round 2
Hi all, Thanks to all the beta testers of v20, you found a lot of bugs!! The 2nd beta is now ready. If you downloaded the first beta you should replace it with the new beta. You can download it from ftp://entropia.com/gimps/v20/p95setup.exe (the fancy installation program) or ftp://entropia.com/gimps/v20/prime95.zip (a plain old zip file) The whatsnew.txt file reads as follows: New features in Version 20.1 of prime95.exe --- 1) A bug in the new GCD code was fixed. 2) Timings in the P-1 stage are no longer cumulative. There is a new feature in undoc.txt for those that prefer cumulative timings. 3) Messages are now output prior to beginning the lengthy GCD. 4) The FactorOverride undocumented feature (not for use with PrimeNet) now supports factoring to a deeper level than prime95 would ordinarily factor. 5) A bug where the worktodo.ini entry was not removed if P-1 found a factor was fixed. 6) If P-1 finds a factor it now deletes any Lucas-Lehmer intermediate files. 7) A crash bug when continuing from a P-1 stage 2 save files with different available memory parameters was fixed. 8) Resuming an LL test now outputs a line to the screen, 9) The Test/Status display now correctly calculates the estimated completion time for an LL test when P-1 factoring is in progress. 10) Advanced/Factor menu choice was deleted. 11) A bug in computing P-1 stage 2 percentage complete was fixed. Have fun, George _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne: Releasing Exponents Reserved During A Malfunction
TWIMC: It's possible to download V20.1.1 ( or anything else) to the wrong directory, missing the whole point of an update process. Re-running the setup program with the correct target directory solves the problem, except that you've re-registered as an apparently new account even though accountname, password and so on are the ones you've always used. Contacting PrimeNet picks up new exponents and merges them with your existing account, although with incorrect completion dates. One further problem remains: releasing the incorrectly mustered exponents. How do I go about doing this? Thanks In Advance, Stefanovic _ Unsubscribe list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
Mersenne Digest V1 #708
Mersenne Digest Monday, March 20 2000 Volume 01 : Number 708
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Date: Sat, 18 Mar 2000 13:52:24 -0800
From: Stefan Struiker [EMAIL PROTECTED]
Subject: Mersenne: P-1 Factoring Walk-Through
TeamG:
Am looking for a detailed, step-by-step walk-through of the P-1
factoring process. Any suggestions?
Thanks And Regards,
Stefanovic
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Date: Sat, 18 Mar 2000 15:51:05 -0600
From: Ken Kriesel [EMAIL PROTECTED]
Subject: Re: Mersenne: M 10133741
M 10133741 is not an assigned QA exponent
(at least by me.)
Scott tells me that the IPS will accept results whether assigned by IPS or
not.
However, the IPS is not involved in issuing QA work; I do that manually,
independently of IPS.
A computer search for the exponent on qa assignments, qa results, and
email correspondence comes up empty except for your question.
Ken
At 06:38 PM 3/17/2000 EST, you ("Nathan Russell" [EMAIL PROTECTED])
wrote:
In a scan of the PrimeNet status page
(http://www.entropia.com/primenet/status.txt)
I noticed that this exponent was due to expire sometime around last
Halloween.
Is there a bug in the server? Is the owner a QA person who is being given
some leniency? If so, why is the server being used?
Nathan
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Date: Sat, 18 Mar 2000 14:50:49 -0800 (PST)
From: Ashton Vaz [EMAIL PROTECTED]
Subject: Mersenne: Quantum Computing
Hi everyone,
I have heard of quantum computing for the past few years and wish
to learn a little more about this subject. Would there be anyone on
this list that is able to suggest an introductory text to this subject
area. I would prefer a text that compares current algorithms that
assume a bit architecture and boolean arithmetic and posits new
algorithms based on possible architectures and arithmetic using quantum
computing. Are there any mappings/translations of current algorithms
to quantum computing algorithms or do computer scientists have to sit
down and invent new algorithms for such machines? How would this
affect the LL-Test? ECM? Thanks.
Ashton Vaz
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Date: Mon, 20 Mar 2000 14:03:09 -0600
From: "Griffith, Shaun" [EMAIL PROTECTED]
Subject: Mersenne: Scientific American: Distributed Computing
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The April edition of Scientific American has an article on distributed
computing:
http://www.sciam.com/2000/0400issue/0400scicit5.html
http://www.sciam.com/2000/0400issue/0400scicit5.html
- -Shaun
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Date: Mon, 20 Mar 2000 17:46:42 EST
From: "Nathan Russell" [EMAIL PROTECTED]
Subject: Mersenne: Possible V20 issue
I
