mersenneforum.org > Data COMPLETE!!!! Thinking out loud about getting under 20M unfactored exponents
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 2022-01-14, 22:42 #1134 Denial140   Dec 2021 23 Posts Unless I am mistaken, 20.1 has just completed! I'm feeling adventurous, so reserving 15.5 for P-1 (as far as I can tell it is not currently reserved, please let me know if I am wrong). I will be running TF on it concurrently, and TF to 73 should be slightly faster than my machine can P-1. However, since it has so many remaining, if people feel TF to 74 would be helpful as well I would welcome help with that.
2022-01-14, 23:21   #1135
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3×11×157 Posts

Quote:
 Originally Posted by Denial140 Unless I am mistaken, 20.1 has just completed! I'm feeling adventurous, so reserving 15.5 for P-1 (as far as I can tell it is not currently reserved, please let me know if I am wrong). I will be running TF on it concurrently, and TF to 73 should be slightly faster than my machine can P-1. However, since it has so many remaining, if people feel TF to 74 would be helpful as well I would welcome help with that.
You are correct .... and thanks

Wow 15.5 is going to need some aggressive P-1 bounds.
Feel free to ignore the following if you understand the math for selecting bounds.

If you'd like a suggestion:
You need 140 factors. If someone will TF to 74 you will still need about 100 factors.
Worst case 140: That requires a +6.55% success rate (140/2139); that means 6.55% higher than the current bounds.
Current bounds likely average something close to 2%.
6.55%+2% = 8.55%.
But for example B2=2M/B2=800M gives a success rate of about 8.8%....HERE.

So, without any TF these would be the minimum bounds to use.
But as you suggested if you plan to TF73 yourself these bounds should be safe.
If you do get TF74 that are probably higher than necessary.

Feel free to use the link above and some basic math to consider other scenarios.

2022-01-14, 23:44   #1136
Denial140

Dec 2021

23 Posts

Quote:
 Originally Posted by petrw1 Your RAM allocated will determine your B2 multiplier. But for example B2=2M/B2=800M gives a success rate of about 8.8%....HERE. So, without any TF these would be the minimum bounds to use. But as you suggested if you plan to TF73 yourself these bounds should be safe. If you do get TF74 that are probably higher than necessary.
I'm not sure yet what my multiplier will be for this range - when I calculated earlier I took it to be the same as for my 20.1 attempts as it seems to be higher for lower exponents. My luck with TF had so far been terrible - no factors out of 300 attempts, so I essentially ignored it and added a few extra factors needed to be safe. From this I calculated B1=3M (with estimated B2=500xB1) - will see how it goes and alter if necessary.

That being said - after I finished 20.1 I let the TF job that was running finish, and what do you know, finally my GPU gets a hit. Of course, just to spite me it's found one on the first attempt in 15.5 as well. If they're all that easy I may not need the P-1 at all

2022-01-14, 23:50   #1137
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3×11×157 Posts

Quote:
 Originally Posted by Denial140 I'm not sure yet what my multiplier will be for this range - when I calculated earlier I took it to be the same as for my 20.1 attempts as it seems to be higher for lower exponents. My luck with TF had so far been terrible - no factors out of 300 attempts, so I essentially ignored it and added a few extra factors needed to be safe. From this I calculated B1=3M (with estimated B2=500xB1) - will see how it goes and alter if necessary. That being said - after I finished 20.1 I let the TF job that was running finish, and what do you know, finally my GPU gets a hit. Of course, just to spite me it's found one on the first attempt in 15.5 as well. If they're all that easy I may not need the P-1 at all
My PC with 24.5G of RAM would have a B2 multiplier or about 500 for that range.

With an expected success rate of 1% TF can be finicky. I've had runs of NF over 600 long and I've had consecutive TF factors. Rest assured over 2,000 exponents you will average about 20 factors. Though I've seen extremes between 12 and 34.

 2022-01-15, 22:48 #1138 linament   Nov 2013 23 Posts I'd like to join the game. Could I reserve 8.7 for P-1? I may do some TF, but not sure my GPU will keep up. So, if anyone else feels the urge, TF is welcome.
2022-01-15, 23:01   #1139
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3·11·157 Posts

Quote:
 Originally Posted by linament I'd like to join the game. Could I reserve 8.7 for P-1? I may do some TF, but not sure my GPU will keep up. So, if anyone else feels the urge, TF is welcome.
Great welcome...reserved ranges are in post #1 of this thread.
But yes 8.7M is free and yours.

If you have a good PC with decent RAM (16G?) TF is probably not necessary (but can't hurt) in this low range.

 2022-01-17, 02:23 #1140 petrw1 1976 Toyota Corona years forever!     "Wayne" Nov 2006 Saskatchewan, Canada 143D16 Posts Reminder: I have just assigned these ranges to my PC's while I'm away 13.1 13.3 14.1 14.4 14.6 14.7 18.0 18.2 18.4 18.8 19.1 19.4 19.9
2022-01-17, 16:59   #1141
masser

Jul 2003
Behind BB

22×3×157 Posts

Quote:
 Originally Posted by petrw1 13.1 13.3 14.1 14.4 14.6 14.7 18.0 18.2 18.4 18.8 19.1 19.4 19.9
Do you mind if I edit the first post to place these ranges in the ordered list? It makes it (slightly) easier for the reader to scroll through one list, looking for potentially available ranges.

2022-01-17, 17:17   #1142
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3·11·157 Posts

Quote:
 Originally Posted by masser Do you mind if I edit the first post to place these ranges in the ordered list? It makes it (slightly) easier for the reader to scroll through one list, looking for potentially available ranges.
Sorry I got it.

 2022-01-17, 17:23 #1143 masser     Jul 2003 Behind BB 22·3·157 Posts Cool, thanks. What will your availability be while you are away? Will you be checking in? Will your machines be sending results? Or will we have a "Great Dump" upon your return? A slightly different form of the traditional Montezuma's revenge...
2022-01-17, 17:29   #1144
petrw1
1976 Toyota Corona years forever!

"Wayne"
Nov 2006

3·11·157 Posts

Quote:
 Originally Posted by masser Cool, thanks. What will your availability be while you are away? Will you be checking in? Will your machines be sending results? Or will we have a "Great Dump" upon your return? A slightly different form of the traditional Montezuma's revenge...
Returning end of March.
I'll be peeking daily.
Machines are all live and connected and reporting... unless they fail in which case I'm relying on my son to give them a kick.

I've taken as many assignments in each range that "should" clear them with minimal overkill.
There is a chance a few could be a little short.
I intend to clear them up when I return; unless someone completes them before I get back.

Last fiddled with by petrw1 on 2022-01-17 at 23:11 Reason: Clarity

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