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Message boards : Problems and Help : GPU Rules of Thumb

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Zach
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Message 136542 - Posted: 22 Jan 2020 | 22:45:46 UTC

I just got a new machine with a much better GPU than I need with the explicit purpose of doing GPU work, which I hadn't been able to do before. I'm not necessarily looking to take my machine to the limit or spend a ton of time optimizing, just looking to make good use of the resource.

Are there any rules of thumb for preferences/configs for a casual cruncher?

Similarly, are there any rules of thumb for what GPU stats/combo of stats translate into a maximum responsible GFN project? (e.g. a pixel fillrate of X means you probably shouldn't try WUs for anything above GFN-YY)



I really am interested in the rules of thumb, but here's more about my specific case if you're curious:

I found that GFN-18 WUs move excruciatingly slowly, but GFN-17-Low cruises along just fine (we're talking an estimated time 500x greater after letting it run for a bit). That's a little confusing as my admittedly basic understanding (from here https://www.primegrid.com/forum_thread.php?id=6491) is that both use similar calculation methods, and the recent average times suggest a difference of 2x-4x longer. It's probable that I'm not understanding how the CPU settings affect GPU tasks: I'm maxing 2 tasks (1 GPU & 1 CPU), no limit on multi-threading, and use at most 11/12 processors (in BOINC settings).

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Message 136544 - Posted: 22 Jan 2020 | 23:06:19 UTC

There's no real "rule of thumb" in regards to GPU tasks for best optimization I find. Just pick a project that seems interesting and go for it. The bigger the number, the longer the task will take.

That said, you have AP27 and GFN18 tasks with errors.
Keeping that in mind we should find out why you're having errors.
One of the most common reasons for errors on Windows 10 is the drivers, but you have a mix of GFN and AP with good results, so it's not likely to be drivers. But can't hurt to try a reinstall/update anyway.
Another common cause of errors is overheating. That's a small 40W card, but that doesn't mean it can't overheat with the workload of the larger GFN or AP tasks. You may want to check the temperature of the card while various tasks are running to see if you're getting too hot (upwards of 80C is usually ok for a GPU). If you find things are getting too hot you might want to find a way to improve ventilation in the case.

In the errors I noted a lot of stop/start requests. To keep a task running all the time you should look at the boinc setting for GPUs and set it to use GPUs always (Actions > Use GPU Always) and then pause the task manually when you want to do something else like game/work/etc.
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Zach
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321 LLR Bronze: Earned 10,000 credits (19,081)ESP LLR Bronze: Earned 10,000 credits (14,586)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (78,214)PPS LLR Gold: Earned 500,000 credits (932,874)PSP LLR Silver: Earned 100,000 credits (192,663)SoB LLR Gold: Earned 500,000 credits (504,136)SR5 LLR Silver: Earned 100,000 credits (290,032)TRP LLR Silver: Earned 100,000 credits (103,396)Woodall LLR Bronze: Earned 10,000 credits (57,278)321 Sieve (suspended) Silver: Earned 100,000 credits (170,768)Generalized Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (123,417)PPS Sieve Silver: Earned 100,000 credits (188,776)AP 26/27 Silver: Earned 100,000 credits (113,204)GFN Silver: Earned 100,000 credits (213,273)
Message 136546 - Posted: 22 Jan 2020 | 23:32:12 UTC - in response to Message 136544.

Thank you! Very helpful information.

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (3,117,969)Cullen LLR Ruby: Earned 2,000,000 credits (3,624,591)ESP LLR Turquoise: Earned 5,000,000 credits (5,021,269)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Sapphire: Earned 20,000,000 credits (20,751,038)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,718,447)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)WW Sapphire: Earned 20,000,000 credits (21,908,000)GFN Emerald: Earned 50,000,000 credits (77,916,132)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 136547 - Posted: 22 Jan 2020 | 23:38:55 UTC

All things being equal, as the 'n' in the GFN number (i.e., the "16" in GFN-16) goes up by one, the amount of time it takes to run the task doubles.

For example, A GFN-18 takes twice as long as a GFN-17. A GFN-19 takes 4 times as long as a GFN-17. And a GFN-22 takes 32 times as long as a GFN-17.

Of course, it's actually a bit more complex than that, but that's a good enough rule of thumb for you to use to figure out roughly how long a certain size GFN should take on your GPU.
____________
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Zach
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Joined: 3 May 18
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321 LLR Bronze: Earned 10,000 credits (19,081)ESP LLR Bronze: Earned 10,000 credits (14,586)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (78,214)PPS LLR Gold: Earned 500,000 credits (932,874)PSP LLR Silver: Earned 100,000 credits (192,663)SoB LLR Gold: Earned 500,000 credits (504,136)SR5 LLR Silver: Earned 100,000 credits (290,032)TRP LLR Silver: Earned 100,000 credits (103,396)Woodall LLR Bronze: Earned 10,000 credits (57,278)321 Sieve (suspended) Silver: Earned 100,000 credits (170,768)Generalized Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (123,417)PPS Sieve Silver: Earned 100,000 credits (188,776)AP 26/27 Silver: Earned 100,000 credits (113,204)GFN Silver: Earned 100,000 credits (213,273)
Message 136549 - Posted: 23 Jan 2020 | 0:10:29 UTC - in response to Message 136547.

All things being equal, as the 'n' in the GFN number (i.e., the "16" in GFN-16) goes up by one, the amount of time it takes to run the task doubles.


So is it fair to say if the difference is really outside that range (as in the 500x I observed going from 17 to 18) there're potentially some settings that are off? Or would one interpret this as the machine has maxed out in some way at 17?

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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 1 mega primeFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de Primes321 LLR Ruby: Earned 2,000,000 credits (3,117,969)Cullen LLR Ruby: Earned 2,000,000 credits (3,624,591)ESP LLR Turquoise: Earned 5,000,000 credits (5,021,269)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Sapphire: Earned 20,000,000 credits (20,751,038)PSP LLR Turquoise: Earned 5,000,000 credits (5,197,957)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (10,007,110)SGS LLR Ruby: Earned 2,000,000 credits (3,718,447)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Ruby: Earned 2,000,000 credits (2,963,361)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,035,522)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,051,121)AP 26/27 Jade: Earned 10,000,000 credits (10,118,303)WW Sapphire: Earned 20,000,000 credits (21,908,000)GFN Emerald: Earned 50,000,000 credits (77,916,132)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 136551 - Posted: 23 Jan 2020 | 0:33:14 UTC - in response to Message 136549.

All things being equal, as the 'n' in the GFN number (i.e., the "16" in GFN-16) goes up by one, the amount of time it takes to run the task doubles.


So is it fair to say if the difference is really outside that range (as in the 500x I observed going from 17 to 18) there're potentially some settings that are off? Or would one interpret this as the machine has maxed out in some way at 17?


I'd say something is very, very wrong, and you should find out what it is. There's really no settings to change.

Do be aware, however, that BOINC is notorious for having terrible time estimates. It's entirely possible that the "500x" you were seeing didn't represent the actual run time.
____________
My lucky number is 75898524288+1

Zach
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Joined: 3 May 18
Posts: 17
ID: 1010731
Credit: 3,006,995
RAC: 0
321 LLR Bronze: Earned 10,000 credits (19,081)ESP LLR Bronze: Earned 10,000 credits (14,586)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (78,214)PPS LLR Gold: Earned 500,000 credits (932,874)PSP LLR Silver: Earned 100,000 credits (192,663)SoB LLR Gold: Earned 500,000 credits (504,136)SR5 LLR Silver: Earned 100,000 credits (290,032)TRP LLR Silver: Earned 100,000 credits (103,396)Woodall LLR Bronze: Earned 10,000 credits (57,278)321 Sieve (suspended) Silver: Earned 100,000 credits (170,768)Generalized Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (123,417)PPS Sieve Silver: Earned 100,000 credits (188,776)AP 26/27 Silver: Earned 100,000 credits (113,204)GFN Silver: Earned 100,000 credits (213,273)
Message 136598 - Posted: 23 Jan 2020 | 18:26:05 UTC - in response to Message 136551.

Thanks for your help, I appreciate it!

Message boards : Problems and Help : GPU Rules of Thumb

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