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Message boards : AP26 - AP27 Search : Hyperthreading

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Profile AzmodesProject donor
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Joined: 30 Dec 16
Posts: 162
ID: 479275
Credit: 1,316,550,326
RAC: 458,513
Discovered 1 mega primeDiscovered 1 AP26Found 2 primes in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Silver: Earned 100,000 credits (408,628)Cullen LLR Bronze: Earned 10,000 credits (29,920)ESP LLR Bronze: Earned 10,000 credits (30,791)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (33,221)PPS LLR Turquoise: Earned 5,000,000 credits (5,008,633)PSP LLR Ruby: Earned 2,000,000 credits (3,562,093)SoB LLR Jade: Earned 10,000,000 credits (10,194,347)SR5 LLR Amethyst: Earned 1,000,000 credits (1,783,647)SGS LLR Gold: Earned 500,000 credits (621,613)TRP LLR Bronze: Earned 10,000 credits (71,189)Woodall LLR Gold: Earned 500,000 credits (524,564)321 Sieve Amethyst: Earned 1,000,000 credits (1,445,427)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (28,919,526)PPS Sieve Double Silver: Earned 200,000,000 credits (241,811,943)TRP Sieve (suspended) Bronze: Earned 10,000 credits (39,046)AP 26/27 Emerald: Earned 50,000,000 credits (79,517,724)GFN Double Bronze: Earned 100,000,000 credits (102,153,827)PSA Double Gold: Earned 500,000,000 credits (840,394,185)
Message 132865 - Posted: 15 Sep 2019 | 12:13:34 UTC

With the upcoming challenge the age-old question poses itself again: Does HT help with throughput for this one or not?

First of all, I normally avoid running subprojects with GPU apps on CPUs, but for the challenge I'm going to throw everything I have at this (it does add up, and the 1950X can contribute almost GTX 980 levels of tasks). Anyway, during last year's challenge I was running the CPU app as well and had HT enabled on every system capable of it. I don't remember explicitly, but I think I did some testing beforehand and found that it made a tiny improving difference.

Yesterday I tested it on an i7-3770 and extrapolated runtimes after the tasks had reached 1%. With only 4 tasks one came in at ~65,000 seconds, with 8 it was ~128,000. Today I clocked those same tasks again (8 running) and times are between 129,000 and 130,000. This would still suggest a miniscule benefit, but there seems to be quite some variation between units as well as speeding up and slowing down throughout single tasks. Bottomline, I'm not so sure anymore that it does help. Worst case scenario it's just twice as long and no harm done (apart from some tasks not making it before the challenge ends, in which case turn if off)?

Anyone have any findings of their own?
____________
Long live the sievers.

Profile AzmodesProject donor
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Joined: 30 Dec 16
Posts: 162
ID: 479275
Credit: 1,316,550,326
RAC: 458,513
Discovered 1 mega primeDiscovered 1 AP26Found 2 primes in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Silver: Earned 100,000 credits (408,628)Cullen LLR Bronze: Earned 10,000 credits (29,920)ESP LLR Bronze: Earned 10,000 credits (30,791)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (33,221)PPS LLR Turquoise: Earned 5,000,000 credits (5,008,633)PSP LLR Ruby: Earned 2,000,000 credits (3,562,093)SoB LLR Jade: Earned 10,000,000 credits (10,194,347)SR5 LLR Amethyst: Earned 1,000,000 credits (1,783,647)SGS LLR Gold: Earned 500,000 credits (621,613)TRP LLR Bronze: Earned 10,000 credits (71,189)Woodall LLR Gold: Earned 500,000 credits (524,564)321 Sieve Amethyst: Earned 1,000,000 credits (1,445,427)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (28,919,526)PPS Sieve Double Silver: Earned 200,000,000 credits (241,811,943)TRP Sieve (suspended) Bronze: Earned 10,000 credits (39,046)AP 26/27 Emerald: Earned 50,000,000 credits (79,517,724)GFN Double Bronze: Earned 100,000,000 credits (102,153,827)PSA Double Gold: Earned 500,000,000 credits (840,394,185)
Message 132956 - Posted: 17 Sep 2019 | 22:11:59 UTC
Last modified: 17 Sep 2019 | 22:14:37 UTC

If anyone cares, I let some tasks run to completion and here are the results:

HT on, 8 tasks in tandem: av. 129,200 seconds (5.35 tasks per day, 37.45 per week)
HT on, 4 tasks in tandem: av. 65,000 seconds (5.31 tasks per day, 37.20 per week)

All things averaged, there seems to be about a 15-minute difference in favour of HT on/100% loaded, which considering the task lengths is quite negligible and perhaps not even significant and just a result of the small sample size. Maybe it'd be even less of a thing if I disabled HT for real (too lazy to do so, sorry). Anyway, I think I'll go for 50% of threads, I just prefer the shorter tasks.
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Long live the sievers.

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Joined: 11 Jul 11
Posts: 210
ID: 105020
Credit: 291,323,061
RAC: 569,279
321 LLR Turquoise: Earned 5,000,000 credits (5,015,220)Cullen LLR Ruby: Earned 2,000,000 credits (3,034,870)ESP LLR Ruby: Earned 2,000,000 credits (2,023,626)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,012,869)PPS LLR Turquoise: Earned 5,000,000 credits (6,922,079)PSP LLR Turquoise: Earned 5,000,000 credits (6,832,556)SoB LLR Turquoise: Earned 5,000,000 credits (5,054,727)SR5 LLR Ruby: Earned 2,000,000 credits (2,033,897)SGS LLR Ruby: Earned 2,000,000 credits (2,015,663)TRP LLR Ruby: Earned 2,000,000 credits (2,013,482)Woodall LLR Ruby: Earned 2,000,000 credits (2,013,659)321 Sieve Ruby: Earned 2,000,000 credits (4,994,348)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,007,004)PPS Sieve Double Bronze: Earned 100,000,000 credits (101,490,915)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)AP 26/27 Sapphire: Earned 20,000,000 credits (20,627,386)GFN Double Bronze: Earned 100,000,000 credits (119,465,048)
Message 132957 - Posted: 18 Sep 2019 | 0:07:46 UTC
Last modified: 18 Sep 2019 | 0:12:50 UTC

Thanks heaps for the info Azmodes.
I'm still trying to work out if I bother with CPU - but every bit helps?
I estimate that my CPUs can do about 5% of what my GPUs can do. Just a guess as I approximated that I could do 1 task per day per core and I have PCs with different amounts of cores. Maybe I just do the CPUs too and find out?

Profile AzmodesProject donor
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Joined: 30 Dec 16
Posts: 162
ID: 479275
Credit: 1,316,550,326
RAC: 458,513
Discovered 1 mega primeDiscovered 1 AP26Found 2 primes in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Silver: Earned 100,000 credits (408,628)Cullen LLR Bronze: Earned 10,000 credits (29,920)ESP LLR Bronze: Earned 10,000 credits (30,791)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (33,221)PPS LLR Turquoise: Earned 5,000,000 credits (5,008,633)PSP LLR Ruby: Earned 2,000,000 credits (3,562,093)SoB LLR Jade: Earned 10,000,000 credits (10,194,347)SR5 LLR Amethyst: Earned 1,000,000 credits (1,783,647)SGS LLR Gold: Earned 500,000 credits (621,613)TRP LLR Bronze: Earned 10,000 credits (71,189)Woodall LLR Gold: Earned 500,000 credits (524,564)321 Sieve Amethyst: Earned 1,000,000 credits (1,445,427)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (28,919,526)PPS Sieve Double Silver: Earned 200,000,000 credits (241,811,943)TRP Sieve (suspended) Bronze: Earned 10,000 credits (39,046)AP 26/27 Emerald: Earned 50,000,000 credits (79,517,724)GFN Double Bronze: Earned 100,000,000 credits (102,153,827)PSA Double Gold: Earned 500,000,000 credits (840,394,185)
Message 132966 - Posted: 18 Sep 2019 | 7:51:12 UTC

I have 58 physical CPU cores I'll be loading up for the challenge. Unless may preliminary calculations are totally off (based on testing with 100+ threads instead, but as we've seen it should be more or less the same), I should be able to do 600-700 tasks for that particular timeframe, the 1950X and 9900k together accounting for more than half of that number. That's about a fifth of what my GPUs can do. Definitely worth it, even though the RTX 2080 alone will manage over 100 tasks more than all the CPUs. But hey, the BOINC spirit and all.
____________
Long live the sievers.

Profile AzmodesProject donor
Avatar
Send message
Joined: 30 Dec 16
Posts: 162
ID: 479275
Credit: 1,316,550,326
RAC: 458,513
Discovered 1 mega primeDiscovered 1 AP26Found 2 primes in the 2018 Tour de PrimesFound 2 primes in the 2019 Tour de PrimesFound 1 mega prime in the 2019 Tour de Primes321 LLR Silver: Earned 100,000 credits (408,628)Cullen LLR Bronze: Earned 10,000 credits (29,920)ESP LLR Bronze: Earned 10,000 credits (30,791)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (33,221)PPS LLR Turquoise: Earned 5,000,000 credits (5,008,633)PSP LLR Ruby: Earned 2,000,000 credits (3,562,093)SoB LLR Jade: Earned 10,000,000 credits (10,194,347)SR5 LLR Amethyst: Earned 1,000,000 credits (1,783,647)SGS LLR Gold: Earned 500,000 credits (621,613)TRP LLR Bronze: Earned 10,000 credits (71,189)Woodall LLR Gold: Earned 500,000 credits (524,564)321 Sieve Amethyst: Earned 1,000,000 credits (1,445,427)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (28,919,526)PPS Sieve Double Silver: Earned 200,000,000 credits (241,811,943)TRP Sieve (suspended) Bronze: Earned 10,000 credits (39,046)AP 26/27 Emerald: Earned 50,000,000 credits (79,517,724)GFN Double Bronze: Earned 100,000,000 credits (102,153,827)PSA Double Gold: Earned 500,000,000 credits (840,394,185)
Message 132986 - Posted: 19 Sep 2019 | 8:35:01 UTC

More testing done on different machines and I got totally different results...

i9-9900k
16 tasks: 21.43 t/day (64,500 secs)
8 tasks: 16.74 t/day (41,300 secs)

1950X
29: 37.85 (66,200)
16: 26.55 (52,100)

Ryzen 2600
12: 13.12 (79,000)
6: 9.95 (52,100)

i7-2600
8: 5.67 (122,000)
4: 4.96 (69,700)

I have no idea why these consistently show HT to help quite a bit while it didn't with the 3770...
____________
Long live the sievers.

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Message boards : AP26 - AP27 Search : Hyperthreading

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