P-1 factoring anyone? - Page 61

petrw1 · 2011-10-18, 23:53

Quote:

Originally Posted by diamonddave

Just a quick question about PrimeNet assignment of P-1 work unit.

If I request P-1 work unit with the manual page, I get assignment in the 57M range. Same thing if I request new work with the Prime95 client.

Yet, if I look at the PrimeNet Summary report, I see that the following range have many available P-1 work unit available:

44M: 407
45M: 1356
46M: 971
47M: 1191
48M: 1795
49M: 437

Why are they not assigned?

My guess would be these are assignments that already have had the LL done so this P-1 is less necessary....and/or because George prefers to hand out P-1 tests just ahead of the current LL wavefront.

KingKurly · 2011-10-19, 01:04

Quote:

Originally Posted by petrw1

My guess would be these are assignments that already have had the LL done so this P-1 is less necessary....and/or because George prefers to hand out P-1 tests just ahead of the current LL wavefront.

You are correct; most (if not all) have had at least one LL test. I've been working through them, grabbing assignments manually (through worktodo,txt, with help from mersenne-aries.sili.net/p1small.php) and manually changing from 2 LL tests saved to 1.1 tests saved.

Some day, I'll catch up to the LL wavefront. Maybe.

kladner · 2011-10-19, 03:59

Referring back to the start of this thread, George said, "I'll be watching over the next few months how many people sign up for P-1 factoring. We have tons of people doing LL and TF, we need more people signing up for P-1."

I have already reset my worker preferences so that two are P-1. I had been reserving 2 of 6 cores for mfaktc, but I'm finding that for daytime, that keeps the GTX460 just too busy for interactive use of the computer.

Now I'm working on another plan. At night I'll run two mfaktc. That will be in 64bit, because they seem to do better there. With the four remaining CPU cores I'll have two "What makes sense" and the aforementioned two P-1's. When I want to use the machine, I'll run one mfaktc and let the fifth CPU core do P-1. I have enough RAM, at least in 64 bit space to be generous to P64 for P-1. Right now I'm trying that with 2048 MB allowed in Win7. With the memory limits in 32 bit I'll have to cut that back to something like 1.3 GB or so.

Will P-1 do OK in that latter case with ~400MB per worker if they all happened to be doing stage 2 at the same time?

Dubslow · 2011-10-19, 05:21

readme.txt suggests 125MB for 50M exponent, or 250MB to be generous.

Brain · 2011-10-19, 05:39

Quote:

Originally Posted by Dubslow

readme.txt suggests 125MB for 50M exponent, or 250MB to be generous.

256MB are not enough for current P-1 assignments. PrimeNet will assign other work then. Give 512MB per core a try. I'm happy with that.

delta_t · 2011-10-19, 07:58

Quote:

Originally Posted by Brain

256MB are not enough for current P-1 assignments. PrimeNet will assign other work then. Give 512MB per core a try. I'm happy with that.

Yeah, more memory for P-1 the better I say. P-1 likes RAM and runs faster with more.

kladner · 2011-10-19, 14:28

Quote:

Originally Posted by delta_t

Yeah, more memory for P-1 the better I say. P-1 likes RAM and runs faster with more.

It certainly seems that P-1 will gulp down as much as it is allowed.

Thanks to all who responded. Brain -I'll see if I can budget that much. I'm kind of counting on not having all three workers doing Stage 2 at the same time.

Mr. P-1 · 2011-10-19, 14:40

Quote:

Originally Posted by kladner

I'm kind of counting on not having all three workers doing Stage 2 at the same time.

You can make sure this never happens by putting

MaxHighMemWorkers=2

In local.txt.

Mr. P-1 · 2011-10-19, 14:44

Quote:

Originally Posted by delta_t

Yeah, more memory for P-1 the better I say. P-1 likes RAM and runs faster with more.

It will also search deeper, and consequently find more factors. Very generous memory will allow it to use the Brent-Suyama extension, which means it will find even more factors.

That said, the returns on extra memory do diminish rather rapidly.

kladner · 2011-10-19, 18:22

Quote:

Originally Posted by Mr. P-1

You can make sure this never happens by putting

MaxHighMemWorkers=2

In local.txt.

Thanks Mr. P-1. I put that in for the 32 bit version. I'm not as concerned in 64 bit, where all 8GB are available.

"Very generous memory will allow it to use the Brent-Suyama extension, which means it will find even more factors."

What qualifies as 'very generous'?

lorgix · 2011-10-19, 18:27

Quote:

Originally Posted by kladner

Thanks Mr. P-1. I put that in for the 32 bit version. I'm not as concerned in 64 bit, where all 8GB are available.

"Very generous memory will allow it to use the Brent-Suyama extension, which means it will find even more factors."

What qualifies as 'very generous'?

Anything that causes stg2 to be run in multiple passes does not qualify. I don't know just how much more is required.

2011-10-19, 03:59	#663
kladner "Kieren" Jul 2011 In My Own Galaxy! 2×3×1,693 Posts	Referring back to the start of this thread, George said, "I'll be watching over the next few months how many people sign up for P-1 factoring. We have tons of people doing LL and TF, we need more people signing up for P-1." I have already reset my worker preferences so that two are P-1. I had been reserving 2 of 6 cores for mfaktc, but I'm finding that for daytime, that keeps the GTX460 just too busy for interactive use of the computer. Now I'm working on another plan. At night I'll run two mfaktc. That will be in 64bit, because they seem to do better there. With the four remaining CPU cores I'll have two "What makes sense" and the aforementioned two P-1's. When I want to use the machine, I'll run one mfaktc and let the fifth CPU core do P-1. I have enough RAM, at least in 64 bit space to be generous to P64 for P-1. Right now I'm trying that with 2048 MB allowed in Win7. With the memory limits in 32 bit I'll have to cut that back to something like 1.3 GB or so. Will P-1 do OK in that latter case with ~400MB per worker if they all happened to be doing stage 2 at the same time?

2011-10-19, 05:21	#664
Dubslow Basketry That Evening! "Bunslow the Bold" Jun 2011 40<A<43 -89<O<-88 3×29×83 Posts	readme.txt suggests 125MB for 50M exponent, or 250MB to be generous.