GFN Prime Search Sieving
It has been a lukewarm response to the re-start of GFN sieving. This sieve will support 3 new N's in the GFN prime search (1048576, 2097152, 4194304). If you have Windows 64 bit and would like to put it to good use in a specialized sieve (one of which might eventually produce the world's largest prime), then please review these instructions.
This manual sieve is located in the Project Staging Area. It's a simple and straight forward process. For more details, please see this post.
Primegrid
World Record Twin Primes
![Shok :shok:](./images/smilies/shok.gif)
Ich kanns nicht glauben und dann noch kurz vor JahresendeOn 25 Dec 2011 13:31:28 UTC, PrimeGrid’s Sophie Germain Prime Search found World Record Twin Primes: 3756801695685*2^666669±1
The twin primes are 200,700 digits long, eclipsing the previous record of 100355 digits. They will enter Chris Caldwell's The Largest Known Primes Database ranked 1st for twins. This is PrimeGrid's third record twin.
The discovery was made by Timothy D. Winslow of the United States using an Intel Core i7 920 @ 2.67GHz with 8 GB RAM running Windows 7 Ultimate. This computer, using LLR, took 9 minutes and 21 seconds to complete the primality tests of both primes. Timothy is a member of The Knights Who Say Ni! team.
![Shok :shok:](./images/smilies/shok.gif)
Neue Projekte für PRPnet: Wieferich und Wall-Sun-Sun
server=WIEFERICH:50:1:prpnet.mine.nu:13000
server=WALLSUNSUN:50:1:prpnet.mine.nu:13001
Folgende Zeile noch in die ini mit eintragen
Achtung, PRPnet 5.02 ist Voraussetzung!
server=WIEFERICH:50:1:prpnet.mine.nu:13000
server=WALLSUNSUN:50:1:prpnet.mine.nu:13001
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Code: Select all
// This is the name of the executable used for Wieferich and Wall-Sun-Sun searches.
// Available ONLY to 64bit OS. Uncomment if you have 64bit OS.
wwwwexe=wwww.exe
GeneferCUDA wird gerade für BOINC getestet, also ein komplett neues Unterprojekt für Primegrid. Tester sind limitiert.
Auf Anfrage hier kann die Einstellung im Account freigeschaltet werden. Sobald ich meine habe, werde ich die Ergebnisse posten. Einen Validator gibt es bisher nicht!
Update:
99% GPU-Last, 4% CPU-Last
Range 8192 - 46s
Range 16384 - 1m36s
Range 32768 - 3m16s
Range 65536 - 8m5s
Range 131072 - 20m45s
Range 262144 - 57m48s
Range 524288 - 3h33m
Auf Anfrage hier kann die Einstellung im Account freigeschaltet werden. Sobald ich meine habe, werde ich die Ergebnisse posten. Einen Validator gibt es bisher nicht!
Update:
99% GPU-Last, 4% CPU-Last
Range 8192 - 46s
Range 16384 - 1m36s
Range 32768 - 3m16s
Range 65536 - 8m5s
Range 131072 - 20m45s
Range 262144 - 57m48s
Range 524288 - 3h33m
Gilt für:AVX build of llr
Gary Craig, a member of Aggie The Pew, was successful in compiling an AVX version of LLR using gwnum v27.2 and LLR v3.8.6dev. We've been testing it for the past week with success. Depending on the LLR project, speed improvements range from 20% to 50%.
•321 Prime Search
•Cullen Prime Search
•Prime Sierpinski Problem
•Proth Prime Search
•Seventeen or Bust
•Sophie Germain Prime Search
•The Riesel Problem
•Woodall Prime Search
Leider nur für Linux64 und MAC zur Zeit mit app_info.xml
Ich hoffe bald auch für ppselow @PRPnet auf Windows.
Kann leider noch nicht die neue pfwg-avx veröffentlichen, da die app bei einem primzahl-test abgeraucht ist. Der Client ging danach auch nicht mehr (5.0.4) Nur mit Hilfe des alten 4.3.7 gings dann wieder. Vielleicht ist der client inkompatibel. Wird jetzt 2 Tage lange mit 4.3.7 getestet. Hoffentlich findet der Entwickler von pfgw und prpnet den Fehler.
February is just a week away which means it is time for the 4th annual Tour de Primes. 2 is the first prime number...and the only even one. Therefore, we have declared February, the 2nd month, as prime month.
We're offering a small informal competition in tribute to this unique prime number. There are no points to be gained or awards to be won...just a simple rare jersey (Yellow, Green, and Polk-a-dot) at the end of the month to add to your badge collection. No pressure or stress other than what you put on yourself. :) For more information, please see Tour de Primes 2012.
Neues zu den genefer screen lags/Einstellungen...
There is now(*) a setting on the PrimeGrid preferences page called "GeneferCUDA Block Size". This can be used to vary the kernel size within Genefer.
Making this number larger increases the speed of the program, and reduces the amount of CPU usage, but may increase screen lag.
Decreasing this number may help with screen lag, but will slow the program and increase CPU usage.
The default value is zero, which lets Genefer choose the best value. That value is 8 for N <= 524288, is 9 for 1048576 <= N <2097152>= 4194304.
Usually, there will be no need to change this value. However, as we start searching the larger N values we will be working in an environment that is new, and it may be necessary to adjust these values. Therefore, it may be beneficial for this setting to be easily adjustable.
(*) If you can't find that setting on the preferences page, don't worry. This post is being written before the setting is implemented. The preferences page will contain a link to this explanation, so this has to be here before the setting can go live. Also, the GeneferCUDA version that supports this feature can't be tested until the preferences page supports the feature, so the setting won't actually be functional until that version of GeneferCUDA is released.
Status-Report:
The TRP sieve still has plenty of life in it. However, the CW sieve is approaching the end. The upcoming Leap Day Challenge will only shorten this time. An official shut down date will probably be announced after the Challenge and will be based on the work that was completed.
At most, there's only 6 months left. At the very least, a 4-6 week window will be given as advance notice before any "pausing of the sieve" is made.
SGS dürfte das nächste Projekt sein, was vielleicht in einem Monat entweder pausiert oder eingestampft wird. Diskussionen über einen anderen Suchbereich sind noch im Gange, entweder eine neue Twin-Prime oder doch die erste echte SGS. Somit dürfte auch der PRPnet Port für SGS nach Leerung beendet werden. Ich denke mal, das es kein neues Projekt geben wird, da die Ressourcen aufgrund der Kosten zurückgeschraubt werden.
Da isse...
Es bleibt weiterhin offen, ob das SGS weitergeführt wird. Leider ist in letzter Zeit auch der PRPnet Port von SGS nicht erreichbar.On 9 April 2011 6:31:14 UTC, PrimeGrid’s Sophie Germain Prime Search found a World Record Sophie Germain prime: 18543637900515*2^666667-1 (2p+1: 18543637900515*2^666668-1)
The prime is 200,701 digits long, eclipsing the previous record of 79,911 digits. It enters Chris Caldwell's “The Largest Known Primes Database” ranked 1st for Sophie Germain primes.
The discovery was made by Philipp Bliedung (pabliedung) of the United States using an Intel Core i7 950 @ 3.07GHz with 12 GB RAM running Linux. Philipp is a member of the USA team.
The prime was verified on 9 April 2012 9:36:15 UTC, by Lee Blyth (IshtarIS) of Australia using an Intel Core i7 2600k @ 3.40GHz with 8 GB RAM running Windows 7 Ultimate. Lee is a member of the Ishtar team.