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Message boards : Number crunching : GFN18 vs 23 on a P100 card

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Message 134630 - Posted: 6 Nov 2019 | 21:27:36 UTC

Found it odd and wondered what others might have to say. I setup 2 manual sieves for GFN18 and 2 for GFN23.

When running the 23 I would think it would be much harder but the P100 I'm renting was pumping out 213-17P a day rate. When it switched over to GFN18 it cut in half to only about 100P a day.

Shouldn't 18 be a lot less demanding ?

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Message 134631 - Posted: 6 Nov 2019 | 21:35:14 UTC - in response to Message 134630.

GFN18 will be limited by the CPU required to feed the GPU quickly enough.
On my gtx1650, I split a GFN18 range into 2 and run both at the same time.
This gets the GPU running at 100%, whereas only 1 CPU is needed to max out on higher GFNs.
I'm sure someone else will chime in as the underlying reason that this is the case.
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Message 134633 - Posted: 6 Nov 2019 | 21:59:45 UTC - in response to Message 134630.

Found it odd and wondered what others might have to say. I setup 2 manual sieves for GFN18 and 2 for GFN23.

When running the 23 I would think it would be much harder but the P100 I'm renting was pumping out 213-17P a day rate. When it switched over to GFN18 it cut in half to only about 100P a day.

Shouldn't 18 be a lot less demanding ?


That's backwards. GFN sieving runs faster at higher N. That's why you get less credit per P sieved at higher Ns than at the lower Ns.

If you want to know why, you'll need to ask someone else. But what you're seeing is correct. Sieving at n=23 runs a lot faster than sieving at n=18.
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Message 134635 - Posted: 6 Nov 2019 | 23:53:36 UTC - in response to Message 134633.

Found it odd and wondered what others might have to say. I setup 2 manual sieves for GFN18 and 2 for GFN23.

When running the 23 I would think it would be much harder but the P100 I'm renting was pumping out 213-17P a day rate. When it switched over to GFN18 it cut in half to only about 100P a day.

Shouldn't 18 be a lot less demanding ?


That's backwards. GFN sieving runs faster at higher N. That's why you get less credit per P sieved at higher Ns than at the lower Ns.

If you want to know why, you'll need to ask someone else. But what you're seeing is correct. Sieving at n=23 runs a lot faster than sieving at n=18.


Still, GFN-18 seems to cap out below the capacity of a good card where large N values don't.

I'd try running 2 at once on that card (either splitting a reservation, as suggested, or just making two reservations) and see what happens.

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Message 134659 - Posted: 7 Nov 2019 | 21:11:34 UTC - in response to Message 134635.

I ran up to 3 sieves in parallel on a 1660 Ti (in fact, 6 sieves on 2 GPU, as I have a system with a 6 core CPU and 2 GPUs), but could not use up to 100% of the GPU. Depending on your GPU and CPU speed, you could try even more than 3 sieves in parallel. Use a GPU monitoring tool to see if it runs at 100%.

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Message 134661 - Posted: 7 Nov 2019 | 22:22:31 UTC

I'm late to this discussion but can someone explain how you run multiple instances on a GPU?

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Message 134663 - Posted: 7 Nov 2019 | 23:07:49 UTC - in response to Message 134661.

For manual sieving, it is, in fact, very straightforward. You reserve n ranges, open n shell command line terminals, and run the command for each reservation in its own shell. I do that on Linux, but I guess Windows works the same.
I find easier to reserve several ranges, instead of splitting and gathering a single range. And if you have fast GPU, you can reserve a much bigger range that way.

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Discovered the World's First base 25 Generalized Cullen prime!!!Discovered 10 mega primesEliminated 2 conjecture "k"sDiscovered 2 AP26sDiscovered 1 twin prime2017 Tour de Primes highest prime count2017 Tour de Primes most Mountain Stage primes2018 Tour de Primes most Mountain Stage primesFound 4 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 4 primes in the 2018 Tour de Primes Mountain StageFound 1 mega prime in the 2018 Tour de Primes Mountain StageFound 1 prime in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Emerald: Earned 50,000,000 credits (65,118,906)Cullen LLR Emerald: Earned 50,000,000 credits (60,367,263)ESP LLR Emerald: Earned 50,000,000 credits (60,387,994)Generalized Cullen/Woodall LLR Double Bronze: Earned 100,000,000 credits (100,245,667)PPS LLR Double Bronze: Earned 100,000,000 credits (190,536,923)PSP LLR Emerald: Earned 50,000,000 credits (62,008,047)SoB LLR Double Silver: Earned 200,000,000 credits (235,646,581)SR5 LLR Emerald: Earned 50,000,000 credits (67,362,893)SGS LLR Emerald: Earned 50,000,000 credits (61,807,610)TRP LLR Double Bronze: Earned 100,000,000 credits (126,022,104)Woodall LLR Emerald: Earned 50,000,000 credits (65,515,619)321 Sieve Double Bronze: Earned 100,000,000 credits (104,010,144)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (30,879,764)Generalized Cullen/Woodall Sieve (suspended) Double Bronze: Earned 100,000,000 credits (100,428,955)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (4,221,257,838)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Bronze: Earned 100,000,000 credits (101,857,516)TRP Sieve (suspended) Emerald: Earned 50,000,000 credits (50,936,081)AP 26/27 Double Amethyst: Earned 1,000,000,000 credits (1,613,043,796)GFN Double Turquoise: Earned 5,000,000,000 credits (5,241,063,184)PSA Double Turquoise: Earned 5,000,000,000 credits (6,049,108,610)
Message 134665 - Posted: 8 Nov 2019 | 0:12:16 UTC - in response to Message 134663.

For manual sieving, it is, in fact, very straightforward. You reserve n ranges, open n shell command line terminals, and run the command for each reservation in its own shell. I do that on Linux, but I guess Windows works the same.
I find easier to reserve several ranges, instead of splitting and gathering a single range. And if you have fast GPU, you can reserve a much bigger range that way.


That's how I do it -- works the same on windows. Running a system with two RTX2080s, I'm running one 18 on each gpu, along with a 22 on one and a 23 on the other.

I also prefer multiple ranges to splitting a range.

I have run 3 sieve tasks per card, but ran into errors (not often, but frequent enough to be annoying). You just have to recall the command and restart the task if that happens.

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Message 134687 - Posted: 8 Nov 2019 | 21:13:14 UTC - in response to Message 134665.


I also prefer multiple ranges to splitting a range.

I have run 3 sieve tasks per card, but ran into errors (not often, but frequent enough to be annoying). You just have to recall the command and restart the task if that happens.


I found also something weird. Sometimes, not always if I run three instances on one GPU one of them stopped and got error like "cannot write factors in log file"
Every instance has own directory.
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Message 134689 - Posted: 8 Nov 2019 | 22:15:27 UTC - in response to Message 134687.
Last modified: 8 Nov 2019 | 22:15:52 UTC


I also prefer multiple ranges to splitting a range.

I have run 3 sieve tasks per card, but ran into errors (not often, but frequent enough to be annoying). You just have to recall the command and restart the task if that happens.


I found also something weird. Sometimes, not always if I run three instances on one GPU one of them stopped and got error like "cannot write factors in log file"
Every instance has own directory.

Do you use Windows or Linux?

I use Linux and I had no such issue, even running all tasks from the same directory. As files are named after the sieving range, there should not be concurrency issues on the factor files.

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Message 134698 - Posted: 8 Nov 2019 | 23:29:45 UTC - in response to Message 134689.


Do you use Windows or Linux?

I use Linux and I had no such issue, even running all tasks from the same directory. As files are named after the sieving range, there should not be concurrency issues on the factor files.


Win 10

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