Mersenne Digest Sunday, June 17 2001 Volume 01 : Number 861 ---------------------------------------------------------------------- Date: Tue, 12 Jun 2001 20:48:12 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Re: Mersenne: Interesting Results.txt Entries Hi, At 05:10 PM 6/11/2001 -0500, C. Daniel Sheets wrote: >then had 3 more SUMOUT errors, then came these interesting lines: > >P-1 found a factor in stage #2, B1=150000, B2=1912500. >ERROR: Factor doesn't divide N! > >Could someone please tell me what these are saying. The P-1 factoring code thought it found a factor of the Mersenne number. The program then verifies the factor and unfortunately found that the factor did not really divide the Mersenne number. Obviously, you've either found a bug in the code or you've got a hardware glitch or interference from other software. >I have since added/reassigned >the exponent to another of my computers to see if the same thing happens. Good idea. >I am suspect of the computer because of the SUMOUT errors and will look at >heat and memory issues. Normally, ILLEGAL SUMOUTS are caused by device drivers not properly saving the FPU state. If you start getting other types of errors, then you have a real hardware problem. Regards, George _________________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Wed, 13 Jun 2001 12:01:15 -0700 From: Michael Gebis <[EMAIL PROTECTED]> Subject: Re: Mersenne: Interesting Results.txt Entries > I am suspect of the computer because of the SUMOUT errors and will look > at heat and memory issues. Thanks for your time. I saw that George already explained the most likely causes of these errors. However, since you brought up memory issues, I'd like to point out memtest86: http://www.memtest86.com/ Whenever I build a new system, I stress test it by running two programs: memtest86 to verify the memory, and prime95 to verify most everything else. Mike _________________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sun, 17 Jun 2001 19:50:05 +0200 From: =?Windows-1252?Q?Ignacio_Larrosa_Ca=F1estro?= <[EMAIL PROTECTED]> Subject: Mersenne: Top Producers Hi, I sent during the last week 10/16 of June five results, as incicate my personal account report: 10763341 64 0xACC8572A17E3CE__ 11-Jun-01 07:16 P3-450AIRD05 10878943 64 0xBEE3F9DCA8E59B__ 11-Jun-01 07:16 P3-600RDIEST 11178493 64 0x43EFB69984C69E__ 15-Jun-01 08:12 PII300-RDIE3 11812687 64 0x870A38C67BE85F__ 12-Jun-01 07:18 P3-667AIRD10 12189953 64 0x618103991F8D30__ 13-Jun-01 07:55 P3-667AIRD11 But, in the Top Producers List (http://www.mersenne.org/top.htm), the number of exponents tested increase only from 811 to 815. Where is the exponent lost? Best regards, Ignacio Larrosa Caņestro A Coruņa (Espaņa) [EMAIL PROTECTED] ICQ #94732648 _________________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ End of Mersenne Digest V1 #861 ******************************
