Should I set MaxStage0Prime in local.txt for mprime?

drkirkby · 2021-06-15, 21:36

I have set

Code:

 Memory=376832

in local.txt, so P-1 factoring can use 368 GB RAM
From the file undoc.txt

If doing P-1 with a very large B1, the program uses about 8MB of memory to
pre-calculate the product of all small primes below 40 million. The primes above
40 million are processed using a slightly slower method. You can elect to use
more memory to move the 40 million threshold higher. In prime.txt enter:
MaxStage0Prime=n

Should I set MaxStage0Prime too, or is it irreverent with "Memory" set to a large value? If it is not irrelevant, what is a sensible number to set MaxStage0Prime to?

Viliam Furik · 2021-06-15, 22:02

I don't have the answer, instead, I would like to join with basically the same question. What is the optimal n for 64 GiB of memory? What is the correct n if I want it to use 1 GiB for the primes?

axn · 2021-06-16, 02:42

What is the B1 you are using? If that is less than the 40 million mentioned, you're good. Else set the MaxStage0Prime to the B1 you intend to use.

The memory allocated for "stage 0" is independent of the memory to be used for stage 2

drkirkby · 2021-06-16, 08:46

Quote:

Originally Posted by axn

What is the B1 you are using? If that is less than the 40 million mentioned, you're good. Else set the MaxStage0Prime to the B1 you intend to use.

The memory allocated for "stage 0" is independent of the memory to be used for stage 2

The largest B1 I have used is less than 1 million. I did a PRP test on the 100 million digit M332646233. Kriesel had already done the P-1 factoring on that, with B1=2 million and B2 = 100 million. But I'm not attempting any more 100 million decimal digit numbers - one was enough to convince me that I don't really have the computing resources to make that sensible.

axn · 2021-06-16, 08:57

Quote:

Originally Posted by drkirkby

Did you type B1 my mistake

Nope. It is applicable for Stage 1 only (Stage 0 is a fast form of Stage 1). Only those of us doing humongous P-1/P+1/ECM on small-ish exponents need to worry about this.

drkirkby · 2021-06-16, 09:23

Quote:

Originally Posted by axn

Nope. It is applicable for Stage 1 only (Stage 0 is a fast form of Stage 1). Only those of us doing humongous P-1/P+1/ECM on small-ish exponents need to worry about this.

Sorry, I removed my comments about you possibly meaning B2 when I re-read undoc.txt. I see you quoted me. My apologies. In that case I will not worry about setting MaxStage0Prime

Viliam Furik · 2021-06-16, 12:06

Quote:

Originally Posted by axn

What is the B1 you are using? If that is less than the 40 million mentioned, you're good. Else set the MaxStage0Prime to the B1 you intend to use.

The memory allocated for "stage 0" is independent of the memory to be used for stage 2

Thanks, that makes sense...

2021-06-15, 21:36	#1
drkirkby "David Kirkby" Jan 2021 Althorne, Essex, UK 2×229 Posts	Should I set MaxStage0Prime in local.txt for mprime? I have set Code: Memory=376832 in local.txt, so P-1 factoring can use 368 GB RAM From the file undoc.txt If doing P-1 with a very large B1, the program uses about 8MB of memory to pre-calculate the product of all small primes below 40 million. The primes above 40 million are processed using a slightly slower method. You can elect to use more memory to move the 40 million threshold higher. In prime.txt enter: MaxStage0Prime=n Should I set MaxStage0Prime too, or is it irreverent with "Memory" set to a large value? If it is not irrelevant, what is a sensible number to set MaxStage0Prime to? Last fiddled with by drkirkby on 2021-06-15 at 22:07

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2021-06-15, 22:02	#2
Viliam Furik "Viliam Furík" Jul 2018 Martin, Slovakia 1100100010₂ Posts	I don't have the answer, instead, I would like to join with basically the same question. What is the optimal n for 64 GiB of memory? What is the correct n if I want it to use 1 GiB for the primes?

2021-06-16, 02:42	#3
axn Jun 2003 2³·683 Posts	What is the B1 you are using? If that is less than the 40 million mentioned, you're good. Else set the MaxStage0Prime to the B1 you intend to use. The memory allocated for "stage 0" is independent of the memory to be used for stage 2