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Old 2022-11-16, 17:30   #12
Mark Rose
 
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Got my first factor: 85566979. Not bad for less than a day since starting.
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Old 2022-11-16, 18:27   #13
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Quote:
Originally Posted by Prime95 View Post
Some double-check exponents could use more P-1.

Requirements:
1) A machine with at least 32GB of RAM.
2) Version 30.8 of prime95
3) Configure prime95 to use 24GB or more.

Reserve some exponents from the list below (post your reservation so the exponents can be removed from the list). My quad core machine is doing one P-1 every ~70 minutes.
Does Prime95 adjust the bounds based on the memory specified? "Pfactor" does not specify bounds. "Pminus1" does. Would this not be the better option if really high bounds are desired?
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Old 2022-11-16, 18:31   #14
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Quote:
Originally Posted by storm5510 View Post
Does Prime95 adjust the bounds based on the memory specified?
Yes. Well, it optimizes the bounds selection given projected odds of finding a factor versus many bounds values and run time estimates for P-1 and PRP and allowed ram usage, for maximum expected computing time savings.
Quote:
"Pfactor" does not specify bounds. "Pminus1" does. Would this not be the better option if really high bounds are desired?
No. Extremely high or low specified bounds specified by humans are likely to not be optimal. See also the attachments here if you're curious how that works out in V30.8b~14 for different exponent classes, allowed memory, and first P-1 or retry P-1 following stage-1-only on specified hardware models.

Last fiddled with by kriesel on 2022-11-16 at 18:43
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Old 2022-11-16, 18:36   #15
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Quote:
Originally Posted by storm5510 View Post
Does Prime95 adjust the bounds based on the memory specified? "Pfactor" does not specify bounds. "Pminus1" does. Would this not be the better option if really high bounds are desired?
Prime95 selects optimal bounds based on the available RAM vs probability of finding a factor vs expected time saved not doing PRP when factor found. Here we don't want "really high" bounds, we want optimal bounds to maximize number of exponents factored (and therefore DC/PRP saved) per time. More RAM will give slightly better chance of factor and slightly longer runtime, but as long as you have at least (as requested in the thread title) 24GB allocated to Prime95 it should give you decent bounds. These assignments here are exponents that have been LL-tested once, but with bad P-1, so running a decent P-1 could potentially save one PRP test (and associated certification). We don't want to spend any more effort looking for factors than is necessary to balance the time savings of finding a few factors, to optimize overall GIMPS throughput.

Last fiddled with by James Heinrich on 2022-11-16 at 18:37
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Old 2022-11-19, 21:48   #16
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Will 24 GB be sufficient for all these assignments under 100M?
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Old 2022-11-19, 21:55   #17
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Sufficient, yes. If you have more RAM by all means make use of it, but 24GB should be fine to give a "decent" P-1 effort, far better than the poor P-1 that was done previously.
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Old 2022-11-23, 05:15   #18
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Here's one we would not have gotten with ordinary bounds, and its factor is 102 bits.

https://www.mersenne.ca/exponent/85408633
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Old 2022-11-28, 16:47   #19
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Mark or anyone can contribute to good first-test wavefront P-1. I have mine configured to queue up some of that automatically if they get close to running out of retry before dc assignments. Good first P-1 prevents the need for retry, and reduces unnecessary first prp.

Last fiddled with by kriesel on 2022-11-28 at 16:48
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Old 2022-11-28, 17:12   #20
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Quote:
Originally Posted by kriesel View Post
Mark or anyone can contribute to good first-test wavefront P-1. I have mine configured to queue up some of that automatically if they get close to running out of retry before dc assignments. Good first P-1 prevents the need for retry, and reduces unnecessary first prp.
Future P-1 was one reason why I built these machine with 32 GB of memory many years ago. They're configured to fetch P-1 once the manually added assignments run out.
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Old 2022-11-28, 17:19   #21
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Quote:
Originally Posted by James Heinrich View Post
I've generated another batch of assignments, mostly 100M-103M.
Should we run another bit level of TF on those first? Yay or nay?
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Old 2022-11-28, 17:32   #22
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Quote:
Originally Posted by Mark Rose View Post
Should we run another bit level of TF on those first? Yay or nay?
Thanks for the reminder, I hadn't updated the few TF level outsiders, they're updated now.
I think TF is already sufficient for them.
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