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Old 2021-11-04, 04:49   #474
VBCurtis
 
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Quote:
Originally Posted by Grotex View Post
I can't really guarantee this ......
It's expensive to run, and I'm using a PC, which really doesn't have a lot of computing power.
I'll withdraw this reservation ......
Can you teach me a little bit about the experience of choosing reservation, preferably of a quantifiable kind?
He just did teach you, by doing the math of number of tests * hours per test.

So, before reserving a range for a new-to-you project, acquire a sieve file to see how many tests it will take to complete the reservation. If one doesn't exist, you might ask in the forum how big a job will be- Gary is quite good with these estimates. If nobody has an estimate, you can sieve for a day, count candidates left, and reduce by 10-20% to reflect what a full sieving effort would reduce out of the file.
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Old 2021-11-04, 07:15   #475
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Adding a little more info.

CRUS has evolved to the point where there are no easy or short reservations. All of the low-hanging fruit has been well searched. That is by design. I would suggest having at least 4 cores running full-time non-stop to make a reservation on the project. 8 cores is better. It's very easy to way underestimate the time it takes to complete a reservation.

On our reservations pages there are many sieve files. All are fully sieved unless otherwise noted. Pick one at your choosing and consider a small n-range portion. Find a k/n pair that is at about 60% of the n-range in which you wish to search. So if you are choosing n=100K-200K pick a test at n=~160K. Run LLR or PFGW on that test. Multiply the test time by the number of tests in your chosen range. That will give you your total CPU time. Divide by the number of cores that you will be running on the range to give you the amount of calendar time needed.

Also see our recommended list. I would suggest avoiding bases on that list unless you have > ~10 cores running full time. Those are our higher priority bases.

Last fiddled with by gd_barnes on 2021-11-04 at 07:17
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Old 2021-11-04, 14:17   #476
Grotex
 
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Quote:
Originally Posted by gd_barnes View Post
Adding a little more info.

CRUS has evolved to the point where there are no easy or short reservations. All of the low-hanging fruit has been well searched. That is by design. I would suggest having at least 4 cores running full-time non-stop to make a reservation on the project. 8 cores is better. It's very easy to way underestimate the time it takes to complete a reservation.

On our reservations pages there are many sieve files. All are fully sieved unless otherwise noted. Pick one at your choosing and consider a small n-range portion. Find a k/n pair that is at about 60% of the n-range in which you wish to search. So if you are choosing n=100K-200K pick a test at n=~160K. Run LLR or PFGW on that test. Multiply the test time by the number of tests in your chosen range. That will give you your total CPU time. Divide by the number of cores that you will be running on the range to give you the amount of calendar time needed.

Also see our recommended list. I would suggest avoiding bases on that list unless you have > ~10 cores running full time. Those are our higher priority bases.
So there is a "recommended list" ......
I would like to apologise: this is the first time I have participated in this project and many aspects were not well thought out, which turned into a very embarrassing situation.
Also, it is clear from the text alone that Mr Barnes' advice is very practical, thank you for your selflessness!
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Old 2021-11-04, 14:19   #477
Grotex
 
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Also, thanks to Mr Curtis's guidance.
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Old 2021-11-04, 16:51   #478
dannyridel
 
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Quote:
Originally Posted by Grotex View Post
Also, thanks to Mr Curtis's guidance.
https://www.mersenneforum.org/showpo...66&postcount=1
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Old 2021-11-04, 20:02   #479
gd_barnes
 
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Quote:
Originally Posted by gd_barnes View Post
<snip>
Also see our recommended list. I would suggest avoiding bases on that list unless you have > ~10 cores running full time. Those are our higher priority bases.
Quote:
Originally Posted by dannyridel View Post
I suggested that he avoid bases on the recommended list.
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Old 2021-11-04, 21:31   #480
dannyridel
 
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Quote:
Originally Posted by gd_barnes View Post
I suggested that he avoid bases on the recommended list.
Ah, I am very sorry, misread!
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Old 2021-11-11, 14:03   #481
Jean Penné
 
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Default Sierpinski odd n's testing

Hi,

K=9267 is now tested up to n = 13,500,823 ; no prime found...
I am continuing with this input file sent to me by Gary.
Regards,
Jean
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Old 2021-11-13, 07:45   #482
Happy5214
 
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I don't remember if Gary said anything about this previously, but have the even k's been tested/accounted for in the R2 2nd conjecture? I did not test them when I initialized my set of data.
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Old 2021-11-13, 17:10   #483
gd_barnes
 
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Quote:
Originally Posted by Happy5214 View Post
I don't remember if Gary said anything about this previously, but have the even k's been tested/accounted for in the R2 2nd conjecture? I did not test them when I initialized my set of data.
Yes they have. There are two even k's remaining at n=2M.
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Old 2021-11-21, 08:53   #484
rebirther
 
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R2 odd/even-n tested to n=8M (6.65-8M)

nothing found, 6 remain

Results emailed - Base released
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