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Old 2007-11-29, 05:16   #122
mdettweiler
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Quote:
Originally Posted by paulunderwood View Post
I plan to hand over the remaining files to PrimeGrid, if and when we find the next prime. I have already discussed this John in emails between us.

PrimeGrid has two advantages. The first is they double-check results -- larger numbers are more error prone. The second advantage is people can just point their Linux and Windows boxes at the server -- Mac Intel too?
PrimeGrid doesn't have a MacIntel app available yet, though I imagine it will be available in the somewhat near future, considering that a MacIntel build of LLR now exists.
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Old 2008-02-02, 09:43   #123
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I thought I had better write something about how things are going for the 321search project.

We have no numbers less than 1 million digits left for first time testing.

PrimeGrid have been on board for a couple of months and they have increased the search's throughput greatly.

We have started testing at 4 million bits. The new batch here for manual testing takes much longer, nearly 50% longer, to crunch compared to the previous batch because the new ones are much longer -- PrimeGrid and James Burt are doing the intermediate ones -- and use a bigger FFT window. The effect of worse caching and bus contention must kick in at some length -- whether we are there yet I do not know.

Last fiddled with by paulunderwood on 2008-02-02 at 15:04
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Old 2008-03-26, 19:38   #124
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My thanks goes to Xyzzy for uploading and hosting the new batch of input files.

Candidate primes start at n=4.35 million or 1,309,480 decimal digits. There is a new FFT size for this batch, so expect individual tests to take about 20% longer than before.

Good luck!
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Old 2008-04-24, 20:53   #125
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The plan now for 321search is to continue with PrimeGrid to n=5M. Thereafter PrimeGrid will take over. They are currently sieving to n=10M. I guess there are 2 or 3 more primes below that.

There is a chance we will find another megaprime below n=5M -- I am hoping for some bunching now in the sequence of 321 primes

With PrimeGrid's help we should be able to finish to n=5M within 6 months
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Old 2008-05-21, 06:22   #126
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PrimeGrid have been running "Drive for Five" for the last week. It will be running until the end of this month. Even if they fail to reach n=5M by then, the time to completing our task will have been greatly shortened -- anything remaining will be mopped up within a month or two

Maybe we will have a bonus prime too

Last fiddled with by paulunderwood on 2008-05-21 at 06:34
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Old 2008-06-15, 12:05   #127
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PrimeGrid and many of its members have done a great work to get to 5M. Although there are hundreds of results to come in, they have exhausted their 321 input :surprised

James Burt has a few outstanding ranges below n=4M. Many of them will be put on the PG server soon. I am still hoping all n=sub-5M will be done by the end of June, but my guess is that there will be a few left over to do then.

Unfortunately, no prime has showed up yet

Last fiddled with by paulunderwood on 2008-06-15 at 12:07
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Old 2008-08-15, 22:45   #128
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I happy now with the coverage of 321 numbers below n=5M. Before this project is achived, I will create a new thread with all the results, including:
  • factors
  • llr residues
  • primes
  • double checks
  • errors

Last fiddled with by paulunderwood on 2008-08-15 at 22:46
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Old 2008-09-22, 21:11   #129
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A change of plan: I have handed all the 321 factors and LLR results over to PrimeGrid. John says they hope to make a public database in the future.

I would like to thank the following for their help with "321search" over the last few years:

* Thomas Ritschel for his major contributions with sieving, crunching LLR, scripts, encouragement, discussion and ideas.
* The many loyal sievers and LLR crunchers who are listed on this subforum and at The Prime Pages
* PrimeGrid users and its organizers for their huge boost to throughput towards the n=5M goal
* Programmers: Jean and George for LLR; Paul Jobling and Geoff for their sieves; Phil Carmody for some Perl wizardry
* Xyzzy for allowing and managing this great message board

Anyone wanting to do some "321" crunching can head over to PrimeGrid, where their help will be welcomed.

Last fiddled with by paulunderwood on 2008-09-22 at 21:41
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