Mersenne Digest Saturday, March 18 2000 Volume 01 : Number 707 ---------------------------------------------------------------------- Date: Thu, 16 Mar 2000 17:47:20 +0100 From: Paul Landon <[EMAIL PROTECTED]> Subject: Mersenne: Any Mersenneries in the Orlando area? Hiya, I'm being sent from Germany to Orlando for a couple of weeks for a training course. It's a hard life but someone has to do it ;-) Are there any Mersenneries who would like to have a pint of L�wenbrau sometime? Does anyone know of a good bookshop near there? I'm not certain that I will be able to pick up from my work email in that time, so please copy any replies to [EMAIL PROTECTED] Prost, Paul Landon _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 16 Mar 2000 17:26:25 +0200 From: Jukka Santala <[EMAIL PROTECTED]> Subject: Re: Mersenne: Bomb While Running Prime [EMAIL PROTECTED] wrote: > While double checking an exponent using version 19.2, Prime bombed with the > message: "This program has performed an illegal operation and will be shut > down". Apparently Prime95 doesn't do "full standard" Windows TCP/IP stuff with all the neccessary error-checking, and this is the result of Prime95 trying to connect to the server in some encironments. Most notably, when the ZoneAlarm 2 free personal firewall (From http://www.zonelabs.com) is operating, Prime95 will fail with this spectacular show. The solution is to click on the ZoneAlarm status bar and go to the program settings, manually allowing Prime95 to contact Internet. You need to do this again every time you install new version of Prime95. (I think the latest version will require you to allow programs to act as a server just to receive the DNS lookup replies, but this is obiviously essentially a bug, so I hope it'll go away in next version). I imagine other firewalls and even dial-on-demand systems might cause similiar effects. -Donwulff _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 16 Mar 2000 22:30:00 -0500 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: V20 beta Hi all, If you feel up to it, please give the beta of version 20 a try. The QA group has verified that the FFT code is working, but have not spent much time verifying all the interactions with the PrimeNet server. 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) Remember to set the available memory in the Options/CPU dialog box. Please report any bugs you find directly to me. The whatsnew.txt file reads as follows: New features in Version 20.0 of prime95.exe - ------------------------------------------- 1) The program now does some P-1 factoring prior to running first time and double-checking Lucas-Lehmer tests. This will increase overall GIMPS throughput. If you install version 20 in the middle of an LL test the program will run the P-1 step if the LL test is less than 50% complete. 2) The Options/CPU dialog box now asks how much memory the program can use during the P-1 factoring. See the "Setting Available Memory" section in the readme.txt file. 3) Stage 1 of P-1 factoring is now faster. 4) The GCD used in P-1 and ECM factoring is now faster. 5) The Test/Manual Operation menu choice has been deleted. 6) The memory options in P-1 and ECM dialog boxes have been deleted. 7) The "send new completion dates" checkbox was moved from the Test/Primenet dialog box to the Advanced/Manual Communication dialog box. 8) A bug in estimating time remaining for a factoring job was fixed. 9) AdvancedFactor now writes a line to the worktodo.ini - just like all the other work types. Have fun, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Thu, 16 Mar 2000 23:46:39 -0500 From: "Vincent J. Mooney Jr." <[EMAIL PROTECTED]> Subject: Re: Mersenne: Any Mersenneries in the Orlando area? I presume George Woltman will reply as he is from the Orlando area, right George? At 05:47 PM 3/16/00 +0100, you wrote: >Hiya, > >I'm being sent from Germany to Orlando for a couple >of weeks for a training course. >It's a hard life but someone has to do it ;-) > >Are there any Mersenneries who would like to have >a pint of L�wenbrau sometime? >Does anyone know of a good bookshop near there? > >I'm not certain that I will be able to pick up from >my work email in that time, so please copy any replies >to [EMAIL PROTECTED] > >Prost, >Paul Landon > >_________________________________________________________________ >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, 16 Mar 2000 21:45:36 -0800 From: Spike Jones <[EMAIL PROTECTED]> Subject: Mersenne: quantum computing Here we go guys... http://dailynews.yahoo.com/h/nm/20000315/tc/science_quantum_1.html If quantum computing becomes possible, we may someday LL all the Mersenne numbers simultaneously. spike _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 17 Mar 2000 09:58:41 -0500 From: "Geoffrey Faivre-Malloy" <[EMAIL PROTECTED]> Subject: RE: Mersenne: V20 beta > 1) The program now does some P-1 factoring prior to running first time > and double-checking Lucas-Lehmer tests. This will increase overall > GIMPS throughput. If you install version 20 in the middle Does this mean that the exponent's that we've already done factoring on will be repopened for P1 tests when Prime95 v20 is released? G-Man _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 17 Mar 2000 13:37:07 -0500 From: "Geoffrey Faivre-Malloy" <[EMAIL PROTECTED]> Subject: RE: Mersenne: V20 beta I just upgraded and am now getting an 2250 error when attempting to contact the primenet servers. Am I doing something wrong??? G-Man _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 17 Mar 2000 14:39:16 -0800 From: Russel Brooks <[EMAIL PROTECTED]> Subject: Mersenne: Quit after current work finishes? How do I quit a pc from GIMPS after the current piece of work finishes (without getting any more work). I tried setting Test->PrimeNet->"Always have this many days of work queued up:" to Zero, but One is as low as it allows. cheers... Russ _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Fri, 17 Mar 2000 17:41:09 EST From: "Nathan Russell" <[EMAIL PROTECTED]> Subject: RE: Mersenne: V20 beta >From: "Geoffrey Faivre-Malloy" <[EMAIL PROTECTED]> >Reply-To: <[EMAIL PROTECTED]> >To: "George Woltman" <[EMAIL PROTECTED]>, <[EMAIL PROTECTED]> >Subject: RE: Mersenne: V20 beta >Date: Fri, 17 Mar 2000 13:37:07 -0500 > >I just upgraded and am now getting an 2250 error when attempting to contact >the primenet servers. Am I doing something wrong??? > >G-Man I was getting that error this morning during a routine new-dates send with v 19.2. I think PrimeNet must have had a momentary service interruption. Which brings me to a question for everyone: How much work should I have cached in case of such interruptions? Currently I'm set through May 9. 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 ------------------------------ Date: Fri, 17 Mar 2000 18:38:35 EST From: "Nathan Russell" <[EMAIL PROTECTED]> Subject: Mersenne: M 10133741 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 ______________________________________________________ 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 ------------------------------ Date: Sat, 18 Mar 2000 11:20:28 -0500 From: George Woltman <[EMAIL PROTECTED]> Subject: Mersenne: V20 beta - bug? or fuctioning as designed? Hi all, At 09:10 PM 3/17/00 -0600, someone wrote: >Is it just me, or did you forget to reset the number of seconds after you >display them when doing the P-1 factoring? The time keeps incrementing >(by 32 seconds) for each iteration. someone else wrote: >Is the P-1 factoring supposed to display the output in a cumulative >manner? I'm not sure how long it should run, but it seems that a long run >could cause the time and clock cycles to get unwieldly large. This was intentional and can easily be changed. Since it is different than the way trial factoring and LL testing is done, I suppose I should change it. If you have any strong reasons why it should be left cumulative, then let me know. Otherwise, expect the final v20 release to reset the timer after each screen output. Regards, George _________________________________________________________________ Unsubscribe & list info -- http://www.scruz.net/~luke/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers ------------------------------ Date: Sat, 18 Mar 2000 15:24:16 EST From: [EMAIL PROTECTED] Subject: Mersenne: Mlucas 2.7a available Dear Mersenners: The source and binaries for selected platforms of Mlucas 2.7a are now available: see ftp://209.133.33.182/pub/mayer/README.html Major changes from v2.7z include: 1) v2.7a has a radix-9 FFT pass capability. This allows one to go from FFT lengths of (say) 256K and 512K to 288K and 576K, rather than having to jump all the way up to 320K and 640K, respectively. This will save folks double-checking exponents above 5.15M or first- time testing above 10.11M anywhere from 12-20% runtime, depending on the FFT length and the platform. For example, Brian Beesley was able to do a double-check of an exponent ~5.6M in just 8 days on his 533MHz Alpha PC164; that exponent would have taken 10 days using v2.7z. 2) v2.7a now allows users to concatenate several partially-completed exponents and their associated savefiles into a single directory; as the code gets to each new exponent in the worktodo.ini file, it first checks to see if there are any savefiles (v2.7z did this only at on program startup, i.e. for the first entry in the .ini file.) Thanks to Siegmar Szlavik for suggesting this. 3) I've condensed some near-repeat code sequences in the carry and wrapper/pointwise-square routines in an effort to reduce their code footprint and thus improve instruction cache usage. Some platforms (Alpha ev4 and ev6, Sparc) benefit from this; on others (Alpha ev5 and MIPS) it seems to make little or no difference. V2.7a is a drop-in replacement for 2.7z; I suggest users upgrade at their earliest convenience, so as to have the radix-9 capability ready when the PrimeNet server starts handing out exponents in the aforementioned ranges, which will occur in the near future. As usual, many thanks to Bill Rea and Brian Beesley, my Sparc and Alpha Linux "compile czars," for the binaries and tunings for those platforms. Happy hunting, - -Ernst p.s.: For those of you confused by my code numbering convention: I use the suffixes x, y and z to label beta versions of the code, thus z (if I choose to use it) comes before a. _________________________________________________________________ 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 #707 ******************************
