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PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor search.

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bcavnaugh
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2019/09/06 18:23:22 (permalink)
New Project:  Fermat Divisor Search
PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor search.

This is a variant of our other PPS (Proth Prime Search) sub-projects and is specially designed to have a better chance of finding a Fermat Divisor.
Unlike most of our other sub-projects, this one will not run forever.
It has a limited number of candidates to check, and once they're gone, the project is over.
My best guess is that this project will last about three months.
It uses the same badge and stats as the other PPS sub-projects, so there's no new badge.
But this is probably the best chance of discovering a Fermat divisor and earning that rare   badge.
For more information and discussion, read this forum thread or join our Discord server.   6 Sep 2019 | 22:18:39 UTC Comment
 
Running without MT HT Off about 2-3 minutes per task.
https://www.primegrid.com/results.php?hostid=502676&offset=0&show_names=0&state=4&appid
 
PrimeGrid preferences
Fermat Divisor Search LLR (PPS-DIV)
k·2n+1 for k=19683 and 5<=k<=49
Supported platforms:
  • Windows: 32 bit, 64 bit
  • Linux: 32 bit, 64 bit
  • Mac: 64 bit
  • Multi-threading is supported but is NOT recommended.  Click here to set the maximum number of threads.

Deadline: 4 days (up to 30 days)
Recent average CPU time: 0:00:00
post edited by bcavnaugh - 2019/09/06 18:27:16

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#1

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    bill1024
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 00:42:53 (permalink)
    Thanks Bill, running a few tasks will see how it goes.

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    #2
    yodap
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 07:53:34 (permalink)
    Thanks bcav!
    Started some up, HT enabled, 6/8 cores. Not to quick here, 30-40 miutes. I'll disable HT when these finish.


     

     
    #3
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 08:20:23 (permalink)
    In all going with HT Disabled and Single MT on my Fast CPUs (AVX512) and MT 2 Cores on my slow CPUs.
    Fast: https://www.primegrid.com/results.php?hostid=502676&offset=0&show_names=0&state=4&appid
    Slow: https://www.primegrid.com/results.php?hostid=911551&offset=0&show_names=0&state=4&appid
    * Starting in 20 minutes after current Tasks complete.

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    Cool GTX
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 08:26:22 (permalink)
    bcavnaugh
    In all going with HT Disabled and Single MT on my Fast CPUs (AVX512) and MT 2 Cores on my slow CPUs.
    Fast: https://www.primegrid.com/results.php?hostid=502676&offset=0&show_names=0&state=4&appid
    Slow: https://www.primegrid.com/results.php?hostid=911551&offset=0&show_names=0&state=4&appid
    * Starting in 20 minutes after current Tasks complete.


    How fast is your system RAM ?

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    #5
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 08:33:14 (permalink)
    Cool GTX
    bcavnaugh
    In all going with HT Disabled and Single MT on my Fast CPUs (AVX512) and MT 2 Cores on my slow CPUs.
    Fast: https://www.primegrid.com/results.php?hostid=502676&offset=0&show_names=0&state=4&appid
    Slow: https://www.primegrid.com/results.php?hostid=911551&offset=0&show_names=0&state=4&appid
    * Starting in 20 minutes after current Tasks complete.

    How fast is your system RAM ?

    3600 MHz on the Fast (i9-7940X 4.20GHz)
    2400 MHz on the Slow (Xeon(R) CPU E5-2667 v4 3.20GHz) .

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    #6
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 09:37:49 (permalink)
    Seems that running 2 Cores is slower on the Slow CPU so going back to Single Core now.
    2 Cores https://www.primegrid.com/result.php?resultid=1022718468
    1 Core https://www.primegrid.com/result.php?resultid=1022712849

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    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 12:20:48 (permalink)
     On the Faster CPU
    Congratulations! Our records indicate that a computer registered by you has found a unique prime number.
    This computer is running BOINC, is attached to the PrimeGrid project, and is assigned to the Proth Prime Search.
    What makes this prime unique is that it's large enough to enter the Top 5000 List in Chris Caldwell's The Largest Known Primes Database.
    Since you have auto-reporting selected, the following prime was submitted on your behalf:
    Added 129901 : 19683*2^1868828+1 (562578 digits)
    This prime was found on this workunit which will automatically show as a prime result after verification by the Largest Known Primes Database.
    If you have any questions or concerns, please contact us and we will surely resolve any problems.
    Once again, congratulations on your find! Thank you for participating in PrimeGrid.
    post edited by bcavnaugh - 2019/09/07 12:29:45

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    #8
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/07 15:43:20 (permalink)
    Seems like Tasks are now taking longer and longer to complete then when we first started.
    Went from 3 Minutes to now over 12 minutes to complete.

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    #9
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/09 12:25:54 (permalink)
    Table Updates: https://www.primegrid.com/stats_div_llr.php

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    #10
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/09 14:16:38 (permalink)
    Tasks are now running longer so I changed over to 2 Core MT Tasks and still with HT Disabled.

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    #11
    bcavnaugh
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    Re: PrimeGrid is proud to announce that we have a new sub-project, the Fermat Divisor sear 2019/09/17 06:19:35 (permalink)
    New World Maths Day Challenge 10-15 October 18:00:00 UTC.
    For more information and discussion, read this forum thread
    Set to run with 3 Core MT HT Disabled on my AVX512 Rigs.
    Running 3 Cores helps reduce the Heat running AVX512 Tasks @ 4200 MHz.
    Going after a New Fermat Prime Divisor Finder Badge.
    post edited by bcavnaugh - 2019/09/17 06:23:44

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    #12
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