Mersenne Digest Saturday, September 11 1999 Volume 01 : Number 624 ---------------------------------------------------------------------- Date: Thu, 09 Sep 1999 19:57:49 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: Prime95 version 19 - better late than never Hi all, Sorry for the delay in releasing v19. It is now available for mersenne mailing list members to beta test. If all goes well, it will be officially released to all GIMPSers in a few weeks. You can get the new version at ftp://entropia.com/gimps/p95b.zip To upgrade prime95, stop and exit the current version. Optionally make a backup of the directory containing prime95. Unzip the new version on top of the old version. Start the new prime95. Next time you contact the server, it will broadcast a welcome message to you. Let me know if there are any problems with this new feature. The message will be deleted prior to the final release of v19. This feature gives us an effective way to inform you of new versions and important bugs or news. Save files are upward compatible from previous versions, but not backward compatible. Thus, do not try this beta if you are in a dual-boot environment. The Linux and NT service versions will be available soon. I'd like to thank the excellent work of the QA team. They located many bugs, bringing you a higher quality beta. The QA team included Ken Kriesel, Brian Beesley, Tom Cage, Jean-Yves Canart, Bryan Fullerton, Marc Getty, Steinar H. Gunderson, Eric Hahn, Alex Healy, Paul Landon, Greg McIntyre, Lawrence Murray, Paul Victor Novarese, Ethan M. O'Connor, Rick Pali, Shane Sanford, Brian Schroeder, Gordon Spence, Joth Tupper, Guillermo Ballester Valor, David Willmore, and Lucas Wiman. And, of course, thanks to Scott Kurowski for his v19 enhancements to the Primenet server. Here is the relevant excerpt from whatsnew.txt: 1) Faster - in some cases as much as 10% faster!. The FFTs were recoded for improved memory and TLB efficiency. Furthermore, optimizations specific to the Pentium Pro and later processors were added. 2) New FFT lengths. The program can now test exponents as large as 79.3 million. Also, smaller FFT lengths are supported for use in ECM and P-1 factoring. 3) More conservative FFT breakpoints. This could actually result in some exponents being slower to test in this version. However, the chance of a fatal rounding error has been reduced. 4) P-1 factoring has been added. Although it is not very practical for large exponents because of a slow GCD routine, it can be used to find new factors of exponents below a few million or so. 5) ECM can now run on large exponents. Once again, the slow GCD routine and high memory requirements might make this impractical for large exponents. 6) ECM and P-1 factoring now support save files. Very handy on lengthy runs. 7) ECM and P-1 factoring lets you specify the amount of memory to use. In some cases, more memory can improve execution speed slightly. 8) A bug in guessing the CPU speed on initial install has been fixed. 9) The preferences dialog now has an option to pause prime95 when a laptop is running on its battery. 10) Error checking has been improved slightly. 11) Factoring is now "layered". That is, prime95 now factors to 2^52, then 2^53, 2^54, and so forth up to the appropriate limit. The factoring output lines have been changed to show percent complete in the current "layer". 12) A bug in running two or more self or torture tests in the same directory has been fixed. 13) Trial factoring above 2^64 is now supported. 14) More trial factoring is now done to take into account the cost of double-checking. 15) Title now contains percent complete when LL testing. By default, the percent complete value is now displayed to 2 decimal places. You can change this by setting PercentPrecision in prime.ini to a value between 0 and 6. 16) Affinity and service name settings moved from prime.ini to local.ini file. Prime95 will automatically move these settings for you. 17) An option to get only 10,000,000 digit numbers to run primality tests on has been added to the Test/Primenet dialog box. See http://www.mersenne.org/prize.htm for rules on claiming the EFF award for finding a 10,000,000 digit prime. 18) The Advanced/Clear primes menu choice has been deleted. 19) The prime95 icon turns yellow when the program is idle. After an error such as ILLEGAL SUMOUT, the icon will blink for 10 seconds. 20) The User Information dialog box allows you to request newsletters and form a team user ID where the team members cannot alter the team name. 21) A bug in the reporting of error counts in the results.txt file has been fixed. 22) The server can now broadcast important messages to the prime95 client. Prime95 will blink the icon until prime95 is activated and then it will display the message. Finally, here is the timings table from my PII-400: V18 timing V19 timing old P-90 timings ---------- ---------- ---------------- 80K 0.038 0.036 96K 0.047 0.0445 0.272 112K 0.058 0.0548 0.332 128K 0.0645 0.0604 0.371 160K 0.086 0.083 0.481 192K 0.104 0.0982 0.589 224K 0.1266 0.1193 0.699 256K 0.141 0.1316 0.778 320K 0.190 0.1726 1.024 384K 0.2292 0.2107 1.244 448K 0.278 0.2520 1.498 512K 0.3102 0.2808 1.680 640K 0.409 0.372 2.470 768K 0.4963 0.453 3.074 896K 0.5985 0.536 3.796 1024K 0.670 0.600 4.202 Please report any problems to me. Enjoy, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 9 Sep 1999 21:43:54 -0400 (EDT) From: Lucas Wiman <[EMAIL PROTECTED]> Subject: Mersenne: Factors of DecMega Scott/all, I downloaded the newest beta for Prime95V19, and set it to ask for 10,000,000 digit Mersennes. In my worktodo.ini file, I got the line: Test=33219379,32 This surprised me! I had tested this number to 2^47, and Alex Kruppa had tested it to at least 2^55 (further investigation revealed 2^60). You should update primenet's files pertaining to this off of those at http://www.informatik.tu-muenchen.de/~kruppa/M33M/index.html - -Lucas Wiman _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 09 Sep 1999 22:37:08 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: Re: Factoring in version 19 Hi, At 09:43 PM 9/9/99 -0400, Matthew Smith wrote: >I love the new beta. It's much faster and accomodates my PIII. But why is >it factoring my most recently assigned number, and not the one I was working >on before I upgraded? That's normal. The new version does more factoring than the old version. It is factoring the second number so that if it does have a factor it can get you a new exponent to test and keep your "days of work queued up" greater than 10. Regards, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 09 Sep 1999 22:44:18 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: Test/Status in version 19 Hi all, One more thing. The timings in prime95 have been recalibrated to my PII-400 instead of my old, deceased P-90. What does that mean? The short explanation is that you should not believe the estimates given in Test/Status. Over time these estimates will become accurate again. Why is this? When version 18 estimated my PII-400's speed it underestimated by 40%. Over time, the RollingAverage value in local.ini grew to 1400 to compensate for the poor guess and give accurate estimates in Test/Status. Well in version 19, prime95 accurately guesses my PII-400's speed and applying the rolling average of 1400 makes it bring in the expected completion dates by 40%. It won't take too long for the rolling average to come down to close to 1000 -- or you can edit your local.ini file my hand and set the RollingAverage to 1000. I hope that wasn't too confusing... Regards, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 10 Sep 1999 01:14:22 -0500 From: Ken Kriesel <[EMAIL PROTECTED]> Subject: Re: Mersenne: Prime95 version 19 - better late than never At 07:57 PM 1999/09/09 -0400, George Woltman <[EMAIL PROTECTED]> wrote: >Hi all, ... >I'd like to thank the excellent work of the QA team. They located >many bugs, bringing you a higher quality beta. The QA team included >Ken Kriesel, Brian Beesley, Tom Cage, Jean-Yves Canart, Bryan Fullerton, >Marc Getty, Steinar H. Gunderson, Eric Hahn, Alex Healy, Paul Landon, >Greg McIntyre, Lawrence Murray, Paul Victor Novarese, Ethan M. O'Connor, >Rick Pali, Shane Sanford, Brian Schroeder, Gordon Spence, Joth Tupper, >Guillermo Ballester Valor, David Willmore, and Lucas Wiman. I count 24 bugs found (excluding items I'd categorize as wishlist items, misunderstandings about the expected behavior or the program, and those errors that were not reproducible). Omitted from the above list of QA team members was Arthur M. Coucouvitis. To all the QA team members: Thanks for all the time and thought contributed. The task is large, with numerous new features, and 67 FFT lengths by my count. I plan to continue the qa process after v19 moves from prerelease status through beta to general release, until every FFT length has at least one successfully double-checked exponent, or a later prime95 version is released. I hope you will continue with us. Ken Ken Kriesel, PE <[EMAIL PROTECTED]> _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 10 Sep 1999 10:18:12 +0100 From: Michael Oates <[EMAIL PROTECTED]> Subject: Mersenne: Big problem with Prime95 version 19 George, Typical the only machine I did NOT backup the files on and it goes nuts on me... Running on a Pentium Pro 200 My user id is MOates I started up the new version, it connected to the server and started to get new numbers to factor it stopped at 14 more numbers before I could stop it, by that time it had stopped getting new numbers to factor on it's own. I now have about 2 years of numbers to LL test !!! It was not ready to get any more numbers, I already had enough work for over 1 month (DaysOfWork=14 in prim.ini) Before this happened I had a few numbers to factor and one to test and the worktodo.ini was... Factor=10440383,55 <- it was half way through this one Factor=10440433,55 Factor=10440461,55 Factor=10440509,55 Factor=10440511,55 Test=7206811,62 It is now... Factor=10440383,55 Factor=10440433,55 Factor=10440461,55 Factor=10440509,55 Factor=10440511,55 Test=7206811,62 Test=7657963,63 Test=7666349,63 Test=7672111,63 Test=7678291,63 Test=7678961,63 Test=7679383,63 Test=7679561,63 Test=7680259,63 Test=7680527,63 Test=7681369,63 Test=7681691,63 Test=7681693,63 Test=7682111,63 Test=7683017,63 Another Problem =============== Another problem reared it's head as soon as it started to factor 7206811,62 (even though it was half way through factoring 10440383,55 before) Prime95 kept contacting the server every 10-15 secs for "Updating computer information on the server" An extract from the prime.log shows what was happening from when I first started with v19... Welcome to GIMPS Prime95 v19, with remote message notification. -- George & Scott Updating user information on the server Updating computer information on the server Sending text message to server: UID: MOates/Mike, UID: MOates, User: Michael Oates, [EMAIL PROTECTED] Getting exponents from server Sending expected completion date for M7657963: Sep 11 1999 Getting exponents from server Sending expected completion date for M7666349: Sep 11 1999 Getting exponents from server Sending expected completion date for M7672111: Sep 11 1999 Getting exponents from server Sending expected completion date for M7678291: Sep 11 1999 Getting exponents from server Sending expected completion date for M7678961: Sep 11 1999 Getting exponents from server Sending expected completion date for M7679383: Sep 11 1999 Getting exponents from server Sending expected completion date for M7679561: Sep 11 1999 Getting exponents from server Sending expected completion date for M7680259: Sep 11 1999 Getting exponents from server Sending expected completion date for M7680527: Sep 11 1999 Getting exponents from server Sending expected completion date for M7681369: Sep 11 1999 Getting exponents from server Sending expected completion date for M7681691: Sep 11 1999 Getting exponents from server Sending expected completion date for M7681693: Sep 11 1999 Getting exponents from server Sending expected completion date for M7682111: Sep 11 1999 Getting exponents from server Sending expected completion date for M7683017: Sep 11 1999 Updating computer information on the server Updating computer information on the server Updating computer information on the server Updating computer information on the server . . etc Notice how the expected completion date is the same date ! I had a look at the other .ini files to see if anything was amiss, in the local.ini there is a line... BroadcastID=1 Surly that should normally be 0, and no matter what I did - restarting Prime95 or editing the value directly to 0 it still contacts the server every few seconds, in fact every time it outputs a line to the window. Help !!! First how can I get rid of all those numbers to test I only wanted the one "7206811,62" Any other ideas as to how I get this working again without messing up any work already done. Even if I had made a backup, there would still be all those numbers to sort out on the server. Another issue ============= While I am here, there is still a problem (that was with v18.1) that as soon as Prime95 (or mprime on linux) tries to contact the server via proxy (WinProxy) starts to bring up the connection (via dialup) but before the dialup completes Prime95 gives the error... ERROR: Primenet error 29 The proxy dialup continues and establises a working internet connection. I can then manually get Prime95 to contact the server. So it is using the proxy, but it's as though there is not enough time allowed before the internet connection is made. (with ISDN this delay is only about 2 secs) I did make a report on this a few days ago, and maybe it has not yet been acted on. I was just hoping the new version would work. Note that I have 2 networks, (home & work) one uses ISDN the other modem, they both have the same problem. Sorry for the long email, but I am sure you can't have too much info when sorting problems out like this. If you want any more info just ask. Thanks, Mike, - -- ATLAS CELESTE - Bevis Star Atlas - & "The CD-ROM" http://www.u-net.com/ph/mas/bevis/ Astronomy in the UK http://www.u-net.com/ph/ _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 10 Sep 1999 15:06:08 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: Re: Big problem with Prime95 version 19 Hi, At 10:18 AM 9/10/99 +0100, Michael Oates wrote: >Sending expected completion date for M7657963: Sep 11 1999 >Getting exponents from server >Sending expected completion date for M7666349: Sep 11 1999 The new version is fast - but not that fast! I've fixed a bug that occured sometimes when the first line in the worktodo.ini file is a "Factor=" line. To those affected, download version 19 again and see if it doesn't return those excess exponents at some point. Let me know by private email if that did not fix the problem. Hope that helps, George BTW, the QA group concentrated on the math code not the client and server interaction. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sat, 11 Sep 1999 11:08:35 -0700 From: "John R Pierce" <[EMAIL PROTECTED]> Subject: Mersenne: error in V19??!? Whoops!!! Welcome to GIMPS Prime95 v19, with remote message notification. -- George & Scott [Thu Sep 09 20:20:31 1999] Factoring M6539111 to 2^63 is 13.93% complete. .... [Fri Sep 10 04:58:58 1999] UID: jp/p3-500, M6539111 no factor to 2^63, WV1: 3ED32B8A [Fri Sep 10 06:21:31 1999] Factoring M6779911 to 2^63 is 14.45% complete. .... [Fri Sep 10 13:57:40 1999] UID: jp/p3-500, M6779911 no factor to 2^63, WV1: 41132D24 [Fri Sep 10 15:17:10 1999] Factoring M8329537 to 2^64 is 8.87% complete. .... [Sat Sep 11 05:24:12 1999] UID: jp/p3-500, M8329537 no factor to 2^64, WV1: 4FFD3775 [Sat Sep 11 08:19:02 1999] Iteration 6700000 / 7817869 [Sat Sep 11 10:34:45 1999] Iteration: 6742784/7817869, ERROR: ROUND OFF (0.4086303711) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sat Sep 11 11:04:20 1999] Disregard last error. Result is reproducible and thus not a hardware problem. Iteration: 6742912/7817869, ERROR: ROUND OFF (0.4086303711) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [worktodo.ini is... Test=7817869,63 Test=7888367,63 Test=6539111,63 Test=6779911,63 Test=7468187,63 Test=8329537,64 local.ini is CPUType=10 CPUSpeed=504 SelfTest64Passed=0 SelfTest80Passed=0 SelfTest96Passed=0 SelfTest112Passed=0 SelfTest128Passed=0 SelfTest160Passed=0 SelfTest192Passed=0 SelfTest224Passed=0 SelfTest256Passed=0 ComputerID=p3-500 CPUHours=24 OldRollingAverage=1386 LastEndDatesSent=936928821 RollingStartTime=0 SelfTest384Passed=1 RollingAverage=997 BroadcastID=1 _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sat, 11 Sep 1999 19:13:45 -0400 From: George Woltman <[EMAIL PROTECTED]> Subject: Re: Mersenne: error in V19??!? Hi John, At 11:08 AM 9/11/99 -0700, John R Pierce wrote: >Iteration: 6742784/7817869, ERROR: ROUND OFF (0.4086303711) > 0.40 >Possible hardware failure, consult the readme file. >Continuing from last save file. >[Sat Sep 11 11:04:20 1999] >Disregard last error. Result is reproducible and thus not a hardware >problem. >Iteration: 6742912/7817869, ERROR: ROUND OFF (0.4086303711) > 0.40 >Possible hardware failure, consult the readme file. >Continuing from last save file. This is not a bug. Brian was right that v19 would ordinarily use a 448K FFT wheras v18 used a 384K FFT. However, v19 is finishing off your exponent using a 384K FFT. You now see why I was a little more conservative with the FFT crossover points. Your 0.4086 error is not much greater than 0.4 and not near the 0.5 error that would corrupt your result. I'd continue onward with your test - you probably would have gotten the same error in version 18. Regards, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sat, 11 Sep 1999 16:55:27 -0700 From: "John R Pierce" <[EMAIL PROTECTED]> Subject: Re: Mersenne: error in V19??!? > This is not a bug. Brian was right that v19 would ordinarily use a 448K > FFT wheras v18 used a 384K FFT. However, v19 is finishing off your > exponent using a 384K FFT. > > You now see why I was a little more conservative with the FFT crossover > points. Your 0.4086 error is not much greater than 0.4 and not near > the 0.5 error that would corrupt your result. > > I'd continue onward with your test - you probably would have gotten > the same error in version 18. ah. yer right. I looked back in my results.txt and found... [Sun Sep 05 02:42:01 1999] Iteration: 4647424/7817869, ERROR: ROUND OFF (0.4007873535) > 0.40 Possible hardware failure, consult the readme file. Continuing from last save file. [Sun Sep 05 03:01:47 1999] Disregard last error. Result is reproducible and thus not a hardware problem. this was with v18... Must just be something funky about this particular candidate, not one other one I've run on this system has triggered this same error (I've been running prime95 24/7 since June on this box) [Sat Jun 26 05:38:31 1999] UID: jp/p3-500, M7636493 is not prime. Res64: B1B90297D4483A26. WU1: AD93C932,1209352,00000000 [Wed Jul 14 04:06:17 1999] UID: jp/p3-500, M7636561 is not prime. Res64: 07124E50AF70224A. WU1: 9ADED520,5521093,00000000 [Sat Jul 31 02:52:42 1999] UID: jp/p3-500, M7636597 is not prime. Res64: D1ED8948161F652F. WU1: C42D91B1,7404799,00000000 [Fri Aug 20 20:36:32 1999] UID: jp/p3-500, M7539533 is not prime. Res64: 3CE1193877330039. WU1: A4347C02,0,80000000 [Tue Aug 24 08:06:32 1999] UID: jp/p3-500, M7666597 is not prime. Res64: DB189558BA6AD87F. WU1: 0FA06293,6759810,00000000 _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sun, 12 Sep 1999 00:42:14 -0500 (CDT) From: Conrad Curry <[EMAIL PROTECTED]> Subject: Mersenne: Mailing list archive By the end of next week I will remove the mailing list archive search function. The index for the archive occupies 1/3 of my disk quota. Considering how little it has been used, I can make better use of this disk space. I hope someone else would be willing to rebuild the index and host it. The mailing list messages up to Feb. 98 can be found below (about 4.2Mb). ftp://ftp.netdoor.com/users/acurry/archive1.zip ftp://ftp.netdoor.com/users/acurry/archive2.zip ftp://ftp.netdoor.com/users/acurry/archive3.zip ftp://ftp.netdoor.com/users/acurry/archive4.zip ftp://ftp.netdoor.com/users/acurry/archive5.zip I used swish http://sunsite.berkeley.edu/SWISH-E/ for the search engine. _________________________________________________________________ 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 #624 ******************************
