Hi all! Recentely "Laura", one of my PCs started testing some Exponents close to the 768K FFT size boundary (i.e. M15143XXX etc.). Even with very reliable hardware, first of all 4X128 MB of ECC Kingston RIMM Modules, this time I wasn't able to avoid a long list of round off errors. This is an excerpt of Laura's results.txt file: [Thu May 30 10:42:24 2002] UID: guido72/Laura, M13612567 is not prime. Res64: E9A2C7414783CCD4. WX1: B3E434EC,11882707,00000000 [Fri May 31 17:31:08 2002] UID: guido72/Laura, M15143129 no factor to 2^65, WX1: 916F64C6 [Sun Jun 02 05:53:42 2002] Iteration: 2497408/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sun Jun 02 06:00:19 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Tue Jun 04 22:11:24 2002] Iteration: 6883072/ , ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Tue Jun 04 22:17:08 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Wed Jun 05 08:23:32 2002] Iteration: 7578880/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Wed Jun 05 08:31:58 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Fri Jun 07 19:59:42 2002] Iteration: 9193600/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Fri Jun 07 20:07:10 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Sat Jun 08 10:40:20 2002] Iteration: 10195072/15143129, ERROR: ROUND OFF (0.4375) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sat Jun 08 10:54:02 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Sat Jun 08 12:29:26 2002] Iteration: 10304384/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sat Jun 08 12:39:18 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Sat Jun 08 18:55:12 2002] Iteration: 10736384/15143129, ERROR: ROUND OFF (0.4375) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sat Jun 08 19:04:09 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Sun Jun 09 08:38:35 2002] Iteration: 11667200/15143129, ERROR: ROUND OFF (0.4375) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sun Jun 09 08:43:42 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Sun Jun 09 20:53:10 2002] Iteration: 12505600/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sun Jun 09 21:03:53 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Mon Jun 10 07:45:44 2002] Iteration: 13239424/15143129, ERROR: ROUND OFF (0.40625) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Mon Jun 10 07:59:14 2002] Disregard last error. Result is reproducible and thus not a hardware problem. [Tue Jun 11 13:01:29 2002] UID: guido72/Laura, M15143129 is not prime. Res64: 1E14FF04F4FEB4CA. WX1: F611E917,4574601,0A000A00
As you may see from the 1st line of this file, the problems started just with these "border line" exponents. Are these results correct or am I returning useless data to the g.i.m.p.s.? I've tryed to downclock the Cpu, after having improoved its cooling system, but with no benefits. Is it better to unreserve these exponents? Thanks a lot for any piece of an advice! Best regards from Italy! PS. Hey George! Take a look to the top 100 producers list: I've definitively entered it, both of them, yours and Primenet one as well!! I think I'll climb a bit more before my (our) first MPrime discovery ;-) _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
