I forgot: How do I reserve a 100M digit Mersenne number?

[JuanTutors]

It's been a LONNNNG while since I've run Prime95 and I don't remember how to reserve a 100M digit Mersenne. I tried to find it but I couldn't and I'm leaving for Albany in a few, and would love to get this set up before I leave. Help!

[ATH]

If you want a random 100M digit exponent you can add these to the prime.txt:
WorkPreference=153
MaxExponents=1

It is also a good idea to add these lines to local.txt:
WorkerThreads=1
CoresPerTest=4

Change the number in the line "CoresPerTest" to the number of physical cores in your CPU (not hyperthreads). That way it will use all the cores on the 100M digit test which will take a long time even then.


But any 100M exponent should have been trial factored to at least 2^80 and maybe further, as well as P-1 test.

If you have your own exponent in mind, you can check if someone else is working on it like this, just change the exponent in the link:
https://mersenne.org/M332208827

and when you want to start, add this line to worktodo.txt, and change the exponent again:
PRP=1,2,332208827,-1

[JuanTutors]

Thanks ATH! I also noticed I asked for first time tests but it gave me a double check. Is this a new behavior to stress test the system instead of the hour long stress test that it used to do? (If not, it's really not a bad idea to go that route ... more DC tests done that way, but I was just wondering.)

[ATH]

Yes, each CPU should receive 1 DC per year unless you actively disables it on the account.

[kriesel]

Originally Posted by ATH

If you have your own exponent in mind, you can check if someone else is working on it like this, just change the exponent in the link:
https://mersenne.org/M332208827

and when you want to start, add this line to worktodo.txt, and change the exponent again:
PRP=1,2,332208827,-1

And first, reserve it, at https://www.mersenne.org/manual_assignment/preferred

work type set to 100 million digit PRP tests
number of tests 1

optional exponent range:
lower value (your favorite exponent minus 1) to
higher value (your favorite exponent plus 1)

You'll either get a PRP assignment for your favorite exponent to copy/paste into worktodo.txt, or an error message.

[ET_]

Once you manually reserve a 100M digits exponent, one should first do TF and P-1 on it.
My question: how do you send TF and P-1 results to the server keeping your PRP reservation still active?

[ATH]

Originally Posted by kriesel

And first, reserve it, at https://www.mersenne.org/manual_assignment/preferred

Adding the PRP line manually to worktodo.txt and then starting Prime95/mprime will reserve it automatically if it is not already reserved to someone else.
You only need to manually reserve it for GPU work, but OP mentions Prime95 which I based my guide on.

[kriesel]

Originally Posted by ATH

Adding the PRP line manually to worktodo.txt and then starting Prime95/mprime will reserve it automatically if it is not already reserved to someone else.

...and if the exponent is available for that type of reservation, and if the prime95 is primenet-enabled; some are, some aren't.

[JuanTutors]

Originally Posted by kriesel

...and if the exponent is available for that type of reservation, and if the prime95 is primenet-enabled; some are, some aren't.

So should I contact or PM someone to reserve me an exponent?

[ATH]

No, just check if there is not already a finished result on it like this one:
https://mersenne.org/M332208827
Unverified 2016-07-01 roemer2201 A6F094BBF34489__ 292252225

or someone currently working on it, like this one:
https://mersenne.org/M332192957
Assigned
2016-01-18 WebPrimes.com LL first test LL 35.3 % 2019-07-27

[kriesel]

Originally Posted by ATH

No, just check if there is not already a finished result on it like this one:
https://mersenne.org/M332208827
Unverified 2016-07-01 roemer2201 A6F094BBF34489__ 292252225

or someone currently working on it, like this one:
https://mersenne.org/M332192957
Assigned
2016-01-18 WebPrimes.com LL first test LL 35.3 % 2019-07-27

Sometimes after passing both those checks, a manual reservation will still fail, with error 40, no available assignment. I have seen numerous occurrences of that, but don't recall whether some were in the 100Mdigit range. That's why I recommend getting a manual reservation with AID. If you've got that, you're good to go. Works anywhere in the mersenne.org exponent range. I think if a block is reserved by gputo72, it does not show up as reserved on the exponent listings.