Mersenne Digest Saturday, December 4 1999 Volume 01 : Number 667 ---------------------------------------------------------------------- Date: Wed, 1 Dec 1999 19:38:46 EST From: [EMAIL PROTECTED] Subject: Mersenne: NBSP: The Evil HTML Conspiracy <<sp; & nbsp; & nbsp; & nbsp; & nbsp; >> Blerg! Do we really need this sort of jibberish? <<I want to thank George for putting the factoring in at the start.>> It's mostly a common practice (I think) to prefactor Mersenne numbers, but I'm sure George welcomes your praise. Stephan "Property of Bill Gates and Andy Grove, but I don't need to love HTML nonsense" Lavavej There is no god but Mersenne and Woltman and Kurowski are his prophets! _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Wed, 1 Dec 1999 19:45:14 EST From: [EMAIL PROTECTED] Subject: Mersenne: Mlucas v2.7z and GIMPS source code timings page Dear all: I am pleased to announce an improved version (still a beta) of my Mlucas code, v2.7z. See ftp:/209.133.33.182/pub/mayer/README for pointers to the source code and various binaries. Changes from v2.7y include: 1) A bug discovered by Brian Beesley related to the printing (but not the actual computation of) the LL residues has been fixed. This bug was causing the upper 44 to 48 bits of some Res64s to be shifted one place in printing. The lower 16 bits were unaffected, and George has assured me that he'll accept any double-checking results where the lower 16 bits match, and most of the upper ones also match upon correction of the shift error. The bug only affects second (or later) exponents in a multi-exponent run, and only if the run in question was never restarted, i.e. ran without any interruptions. Note that the bug could not have prevented you from getting credit for finding a Mersenne prime, since a string of zeros would be unaffected. 2) The leading space in printed 'M(...' output lines has been removed, so you no longer have to worry about stripping out leading spaces prior to sending your results to the PrimeNet server. 3) George's and my e-mail addresses have been updated, so if one of your runs dicovers the newest Mersenne prime, you'll actually be able to contact us. :) 4) I've made some improvements in the carry propagation phase of the code, which should give a small but noticeable speedup on some (especially lower- end) systems. 5) Thanks to Bill Rea's run-time profiling efforts, the SPARC binary is now roughly 10% faster at nearly all runlengths. 6) All binaries are now statically linked (e.g. compiled using the -non_shared option), so there's no more need for mucking about with Fortran run-time library (RTL) files. Just download, unzip, give yourself execute permission, and run. 7) The FFT vs. exponent breakpoints have been made slightly more conservative - Pmax now is about 98% that of Prime95 at each length. (Several users of v2.7y reported that their jobs quit with fatal roundoff error messages for exponents near the v2.7y breakpoints). Savefiles are of course fully compatible with v2.7y. Note that if for any reason you find v2.7z to run more slowly on your hardware, another way to work around the Res64 print bug is to simply stop and restart your current v2.7y job. On a related front,I've put together an initial version of a GIMPS source code timings page, whose main purpose is to guide non-x86 users in choosing the best code for their platforms (or perhaps vice versa :) The page is at ftp://209.133.33.182/pub/mayer/gimps_timings.html. Thanks to Brian Beesley, Bill Rea, George, and all the other beta testers who sent me comments and timings. Happy hunting, - -Ernst p.s.: I'm cc'ing this to a short list of known Mlucas users - if you'd like to be included on or removed from the Mlucas mailing list, or just to let me know that you're using the code (and roughly how many machines you're running on), please send me private e-mail. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 08:12:51 +0100 (CET) From: Henrik Olsen <[EMAIL PROTECTED]> Subject: Re: Mersenne: IPS Database Synchronization On Wed, 1 Dec 1999, Rich Harms wrote: > My individual account report on IPS has accumulated 18 LL tested > exponents in the "Exponents Cleared since last Synchronization" > section, the oldest having been completed on 29 Mar 99. In fact 5 of > the oldest results recently changed status from "first LL test" to > "double check". Is this a common situation across the IPS accounts, > or is my account "unique" for some reason and not being cleared by the > periodic synchronizations? > > Regards, > Rich Harms I haven't noticed any changing status, but with 45 results since last sync 37 of which are doublechecks I probably wouldn't remember anyway. The long list is definitely not strange. - -- Henrik Olsen, Dawn Solutions I/S URL=http://www.iaeste.dk/~henrik/ `Can you count, Banjo?' He looked smug. `Yes, miss. On m'fingers, miss.' `So you can count up to ...?' Susan prompted. `Thirteen, miss,' said Banjo proudly. Terry Pratchett, Hogfather _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 07:26:46 -0700 From: "Aaron Blosser" <[EMAIL PROTECTED]> Subject: RE: Mersenne: IPS Database Synchronization > I haven't noticed any changing status, but with 45 results since last > sync 37 of which are doublechecks I probably wouldn't remember anyway. > > The long list is definitely not strange. I've got 354 cleared exponents since the last sync. It's getting hard to wade through all that. :-) Although, mine only go back to June 21st. I think when Scott and George do a database sync, they tag some to not sync until later. Why? I don't know, but I know that sometimes when they do a sync, I still have cleared exponents that are weeks to months old in there. Oh well. _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 09:53:34 -0600 From: "Griffith, Shaun" <[EMAIL PROTECTED]> Subject: Mersenne: GIMPS in Dallas Morning News GIMPS (along with SETI@Home <mailto:SETI@Home> and everything else) made it in the Dallas Morning News in the Person@l <mailto:Person@l> Technology section (print version). Maybe someone can search the online version at http://www.dallasnews.com/ for the story (I don't have time this morning). - -Shaun ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Shaun Griffith, Texas Instruments MSP Multimedia, [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]> work (972)480-2186, fax (972)480-3555, pager (972)598-6823 alpha pager: page Shaun <mailto:[EMAIL PROTECTED]?subject=pageshaun> Quantum Mechanics: The dreams stuff is made of _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 12:33:17 -0500 From: Pierre Abbat <[EMAIL PROTECTED]> Subject: Re: Mersenne: GIMPS in Dallas Morning News http://www.dallasnews.com/technology/1202ptech9pcs.htm _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 02 Dec 1999 10:09:09 -0800 From: Eric Hahn <[EMAIL PROTECTED]> Subject: Re: Mersenne: GIMPS in Dallas Morning News Shaun Griffith wrote: >GIMPS (along with SETI@Home <mailto:SETI@Home> and everything >else) made it in the Dallas Morning News in the Person@l ><mailto:Person@l> Technology section (print version). > >Maybe someone can search the online version at http://www.dallasnews.com/ >for the story (I don't have time this morning). That address for anybody interested is: http://www.dallasnews.com/technology/1202ptech9pcs.htm Eric _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 02 Dec 1999 13:25:30 -0500 From: Brian Pinto <[EMAIL PROTECTED]> Subject: RE: Mersenne: GIMPS in Dallas Morning News Here it is: http://www.dallasnews.com/technology/1202ptech9pcs.htm > -----Original Message----- > From: Griffith, Shaun [SMTP:[EMAIL PROTECTED]] > Sent: Thursday, December 02, 1999 10:54 AM > To: '[EMAIL PROTECTED]' > Subject: Mersenne: GIMPS in Dallas Morning News > > GIMPS (along with SETI@Home <mailto:SETI@Home> and everything else) > made it > in the Dallas Morning News in the Person@l <mailto:Person@l> > Technology > section (print version). > > Maybe someone can search the online version at > http://www.dallasnews.com/ > for the story (I don't have time this morning). > > -Shaun > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > Shaun Griffith, Texas Instruments MSP Multimedia, [EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]> > work (972)480-2186, fax (972)480-3555, pager (972)598-6823 > alpha pager: page Shaun <mailto:[EMAIL PROTECTED]?subject=pageshaun> > Quantum Mechanics: The dreams stuff is made of > > _________________________________________________________________ > Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm > Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 15:45:30 -0600 From: "Willmore, David" <[EMAIL PROTECTED]> Subject: RE: Mersenne: Error 2250 using Linux mprime All, Sorry to followup to this months later, but I just moved some of my more 'embedded' linux system to 19.1 and hit my first 2250 problem. I added the EntropiaIP line and that didn't fix things. So, I took a look in /lib. Strangely, I found a libnss_dns-2.0.7.so and a symlink pointing to it called, of all things, libnss_dns.so.1, not ".2" like I would have expected. So, I created a ".2" symlink and, what do you know, it works. I don't know if the EntropiaIP line is necessary with this fix, but I'm not going to touch it as long as it works. :) BTW, the configuration is a stock RH5.2 system. Just FYI for anyone looking for the easiest fix. Cheers, David > -----Original Message----- > From: George Woltman [SMTP:[EMAIL PROTECTED]] > Sent: Monday, October 25, 1999 8:48 PM > To: [EMAIL PROTECTED] > Subject: Mersenne: Error 2250 using Linux mprime > > Hi all, > > This was just reported to me. Others may find it useful. > > Regards, > George > > I took the liberty of looking at this. It appears that even w/ "gcc > -static", the new glibc name resolution stuff contains explicit uses of > several dynamic libraries. If these libraries aren't present, > gethostbyname(3) will silently fail, yielding the 2250 errors. > > There's a discussion of this in the usenet archives at: > > http://x35.deja.com/getdoc.xp?AN=414019916&CONTEXT=940892973.188547100&hit > nu > m=0 > > I worked around this by moving the following .so's to my bootdisk for my > ips machines: > > libc.so.6 > ld-linux.so.2 > libnss_dns.so.2 > libresolv.so.2 > > This may not be ideal for everyone. > > > > _________________________________________________________________ > Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm > Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 2 Dec 1999 23:22:47 EST From: [EMAIL PROTECTED] Subject: Re: Mersenne: Mlucas v2.7z and GIMPS source code timings page Brian Beesley mentioned not being able to ftp the Mlucas v2.7z SPARC binary - turns out I had the permissions for all the new binaries set wrong, so if you had problems downloading any of them (or any other files on my ftp site), try it now. Bill Rea reports he got significantly improved timings on his SPARC E450 by redoing them when the machine was idle - I tried this on my Alpha 21164 (the 400MHz machine in Table 1 of the timings page) and lo and behold, a speedup of roughly 10% at nearly all FFT lengths. I've revised that timings column. I did not observe a similar effect on my older 21064, and the 21264 I have a guest account on is almost never idle, so I haven't had a chance to try it there. I switched my own current-exponent run on the 21164 from v2.7y to v2.7z today, and the timing for 2000 iterations at 384K has dropped from 11 minutes to 10. That was nice to see, as it will cut 3 days off a full run at that length. Cheers, - -Ernst ftp://209.133.33.182/pub/mayer/README ftp://209.133.33.182/pub/mayer/gimps_timings.html _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sat, 4 Dec 1999 08:55:02 -0500 From: "Olivier Langlois" <[EMAIL PROTECTED]> Subject: Mersenne: Strange Prime95 behavior. Can anyone explain ??? This is a multi-part message in MIME format. - ------=_NextPart_000_0007_01BF3E35.40B73300 Content-Type: text/plain; charset="Windows-1252" Content-Transfer-Encoding: 7bit Hi, Yesterday, my Prime95 client have contacted the Primenet server to get more work to do and since then, my client stopped to do the LL test on the unfinished prime M7943231. Can anyone explain why ? I hope there is something I can do to finish to test this prime. I would find it a little bit frustrating to have wasted all this time for nothing. Thank you Updating computer information on the server Sending expected completion date for M7943231: Dec 18 1999 [Tue Nov 30 19:42:05 1999 - ver 19.0] Updating computer information on the server ERROR: Primenet error 12031 [Tue Nov 30 20:42:24 1999 - ver 19.0] Updating computer information on the server Sending expected completion date for M7943231: Dec 17 1999 [Fri Dec 03 18:01:08 1999 - ver 19.0] Getting exponents from server Sending expected completion date for M33233749: Nov 09 2003 [Fri Dec 03 20:52:09 1999 - ver 19.0] Sending result to server for exponent 33233749 Sending text message to server: UID: lano1106/358BeaubienE, M33233749 has a factor: 18930411095715929 Getting exponents from server Sending expected completion date for M33233791: Nov 09 2003 prime fact current days exponent bits iteration run / to go / exp date updated date assigned computer ID - -------- -- ---- --------- ----------------- --------------- ------------ - --- ------------ 7860557 63 3538943 43.5 30.3 67.3 03-Dec-99 21:53 22-Oct-99 00:26 Beltron1 7943231 63 6266623 147.7 13.5 61.5 01-Dec-99 01:45 09-Jul-99 21:36 358BeaubienE 8119919 63 4450264 129.8 46.0 72.0 18-Nov-99 13:47 27-Jul-99 18:34 mtlaurier 8823691 64 4653056 25.6 15.5 65.5 02-Dec-99 02:33 08-Nov-99 23:10 csv2 8829229 64 2424832 24.8 26.0 66.0 02-Dec-99 13:26 09-Nov-99 17:13 csv4 8829827 64 4972457 24.8 12.5 65.5 02-Dec-99 01:14 09-Nov-99 18:09 csv3 8887667 64 2686976 17.7 30.5 65.5 02-Dec-99 01:12 16-Nov-99 21:45 csv1 33233791 * 32 0.5 1437 64.5 04-Dec-99 01:55 358BeaubienE Lucas-Lehmer testing : 8 Factoring only : 0 Double-checking LL : 0 - ---------------------- ------- TOTAL : 8 ------- Exponents Cleared since last Synchronization ------- prime fact Lucas-Lehmer residue or factor exponent bits [residues partially masked] date returned computer ID - -------- ---- -- -------------------------------- --------------- -------- - ---- 6694537 62 0xA77119DB732CA5__ 11-Aug-99 23:45 mtlaurier 8248321 63 0x916EF0A8D8FCF9__ 07-Nov-99 23:14 Beltron1 33233749 54 F 18930411095715929 04-Dec-99 01:55 358BeaubienE Olivier Langlois - [EMAIL PROTECTED] - http://www3.sympatico.ca/olanglois Nortel Networks 514-818-1010 x46659 Montreal, Canada - ------=_NextPart_000_0007_01BF3E35.40B73300 Content-Type: text/x-vcard; name="Olivier Langlois.vcf" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="Olivier Langlois.vcf" BEGIN:VCARD VERSION:2.1 N:Langlois;Olivier FN:Olivier Langlois ORG:Beltron TEL;WORK;VOICE:514-818-1010 x46659 ADR;WORK:;Nortel Networks;;St-Laurent;;;Canada LABEL;WORK;ENCODING=3DQUOTED-PRINTABLE:Nortel = Networks=3D0D=3D0ASt-Laurent=3D0D=3D0ACanada ADR;HOME;ENCODING=3DQUOTED-PRINTABLE:;;390 de = Villars=3D0D=3D0A=3D0D=3D0A;Laval;Quebec;H7M 1P9;Canada LABEL;HOME;ENCODING=3DQUOTED-PRINTABLE:390 de = Villars=3D0D=3D0A=3D0D=3D0A=3D0D=3D0ALaval, Quebec H7M = 1P9=3D0D=3D0ACanada X-WAB-GENDER:2 URL:http://www3.sympatico.ca/olanglois EMAIL;PREF;INTERNET:[EMAIL PROTECTED] REV:19991204T135502Z END:VCARD - ------=_NextPart_000_0007_01BF3E35.40B73300-- _________________________________________________________________ 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 #667 ******************************
