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-   -   Help needed for doublecheck sieving! (https://www.mersenneforum.org/showthread.php?t=9996)

mdettweiler 2008-03-07 02:10

[quote=henryzz;127958]to be honest i check mersenneforum twice a day and email once or twice a week[/quote]
Me, I check mersenneforum probably 10+ times a day, and my personal email box once or twice a day. I have a separate address for things like prime searching, and I check it 2-3 times a day (usually right after checking mersenneforum). :smile:

henryzz 2008-03-07 07:40

i tend to spend my whole evening reading mersenneforum so saying twice a day understates really as one of them is 2-3 hours

mdettweiler 2008-03-13 05:37

Gary just recently heard from jasong about the status of his reserved range here, and here's the scoop: apparently jasong messed up pretty bad with this range, and ended up sending Gary a hodgepodge of out-of-order factors with lots of gaps in between, and he didn't know where the gaps were. Gary analyzed the factors and figured out where the gaps are, sorted the factors, and sent the info to me. I checked the factors to see if they were valid (in case some of them got messed up along the way; fortunately, all of them were valid), and removed them from the sieve file.

There's a bunch of gaps that will need to be filled, and it's too much for me to handle by myself. If anyone would like to help fill the gaps, please email or PM me (PM preferred as I check mersenneforum more than that particular email box) and I'll send you a range and instructions for running it. :smile:

grobie 2008-03-14 00:12

I wish you would of posted earlier I would help sieve, being my computer is way faster sieving than LLR testing, but I just took a range from 1st drive.

mdettweiler 2008-03-14 00:41

[quote=grobie;128759]I wish you would of posted earlier I would help sieve, being my computer is way faster sieving than LLR testing, but I just took a range from 1st drive.[/quote]
Sorry, I just heard about jasong's range problems late yesterday. :sad: However, don't worry, there's plenty of gaps to fill--there should be plenty left to work on when you've finished your 1st drive range. :smile:

Mini-Geek 2008-03-14 12:30

[quote=Anonymous;128760]Sorry, I just heard about jasong's range problems late yesterday. :sad: However, don't worry, there's plenty of gaps to fill--there should be plenty left to work on when you've finished your 1st drive range. :smile:[/quote]
I'll grab a range, too, once I finish my Drive 3 range (5 days, give or take). I don't really know that my CPU is faster for sieving than LLR, but it's Athlon, and I've heard they are. The Drive 3 range is split between my cores, so I'll actually reserve and work on the sieving before the range is completely done.
My current range is near an FFT boundary (keeps going back and forth 24K and 28K with big time differences, based on k, at the moment), so it's hard to give an accurate estimate as to how long it will take.

mdettweiler 2008-03-14 16:25

[quote=Mini-Geek;128775]I'll grab a range, too, once I finish my Drive 3 range (5 days, give or take). I don't really know that my CPU is faster for sieving than LLR, but it's Athlon, and I've heard they are. The Drive 3 range is split between my cores, so I'll actually reserve and work on the sieving before the range is completely done.
My current range is near an FFT boundary (keeps going back and forth 24K and 28K with big time differences, based on k, at the moment), so it's hard to give an accurate estimate as to how long it will take.[/quote]
Yes, Athlons are excellent sieving machines, and generally are better at sieving than LLR (though obviously you can still do LLR just fine on them). :smile:

As for the sieving range, would you like me to give you the range now? Ranges of all sizes are available (and I can split some if need be). :smile:

Mini-Geek 2008-03-14 16:36

[quote=Anonymous;128782]Yes, Athlons are excellent sieving machines, and generally are better at sieving than LLR (though obviously you can still do LLR just fine on them). :smile:

As for the sieving range, would you like me to give you the range now? Ranges of all sizes are available (and I can split some if need be). :smile:[/quote]
Sure, I'll take a range now. I just figured I'd wait, so I don't have a low range that's unfinished, but if that's not a problem I'll take one now. I'll take a 20G range (should take ~3 days, I just timed a 1M range at 130G and it comes to a little under 6 days, but was sharing a core with LLR). Should I use the sr2data.txt currently linked from the first post here ([URL]http://bugmesticky.googlepages.com/nplb-doublecheck-sieve-comb_130G.zip[/URL] modified 02/21) or is there a new version with factors taken out (specifically, 130G-310G, whatever jasong got of 310G-550G, and 550G-600G) so it's faster? As there would be less numbers to check, I'm assuming that does translate to a faster speed, no?
Edit:What's my range?

mdettweiler 2008-03-14 16:49

[quote=Mini-Geek;128784]Sure, I'll take a range now. I just figured I'd wait, so I don't have a low range that's unfinished, but if that's not a problem I'll take one now. I'll take a 20G range (should take ~3 days, I just timed a 1M range at 130G and it comes to a little under 6 days, but was sharing a core with LLR). Should I use the sr2data.txt currently linked from the first post here ([URL]http://bugmesticky.googlepages.com/nplb-doublecheck-sieve-comb_130G.zip[/URL] modified 02/21) or is there a new version with factors taken out (specifically, 130G-310G, whatever jasong got of 310G-550G, and 550G-600G) so it's faster? As there would be less numbers to check, I'm assuming that does translate to a faster speed, no?[/quote]
As for the sieve file--because of the way sieve speed works (it has something to do with logarithms, I think), removing candidates from the file only gives a small speed boost at higher (i.e. not <50-100G) ranges like the ones we're doing now. However, since it's not too hard for me to do, I'll post an updated sieve file anyway. :smile:

As for your 20G range: Okay, your range is 320G-340G. :smile: I was able to carve out an even 20G range from one of the larger gaps, so you can just punch it in to sr2work.txt and run it as usual. :smile: (Some of the gaps might not be easy to split up into even chunks of G like this one, so they will need to be fed to sr2sieve from the command line rather than through sr2work.txt, which deals only in ranges of G.)

mdettweiler 2008-03-14 16:53

Okay, here's the updated sieve file:

[url]http://bugmesticky.googlepages.com/NPLB-doublecheck-sieve_03142008.zip[/url]

I'm not going to quote an exact figure on sieve depth for this one, as it's got factors removed from all over the spectrum (even some from over 600G, because jasong apparently sieved a little bit past 600G by accident). :smile:

Mini-Geek 2008-03-14 17:04

Okay, thanks. I've downloaded and set up everything (played around with sr2sieve a little while back, so I wasn't completely lost setting it up), now I just have to wait for my core to free up and I'll get crunching on that.


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