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Message boards : Problems and Help : Multi-thread, is which tasks?

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Endead383
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Joined: 3 Jan 19
Posts: 49
ID: 1090226
Credit: 1,333,424
RAC: 240
321 LLR Bronze: Earned 10,000 credits (11,081)PPS LLR Bronze: Earned 10,000 credits (37,343)SGS LLR Bronze: Earned 10,000 credits (56,997)321 Sieve Bronze: Earned 10,000 credits (12,198)PPS Sieve Silver: Earned 100,000 credits (128,098)AP 26/27 Gold: Earned 500,000 credits (521,547)GFN Gold: Earned 500,000 credits (549,439)
Message 129606 - Posted: 18 May 2019 | 19:08:42 UTC
Last modified: 18 May 2019 | 19:11:40 UTC

My question is;

In which projects is posible to use Multi-thread? only cpu or gpu too? only LLR or sieve and GFN?

END383
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123547534^32768+1 (GFN 15) 265154 digits

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Profile Michael GoetzProject donor
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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 Primes321 LLR Ruby: Earned 2,000,000 credits (2,063,182)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Ruby: Earned 2,000,000 credits (2,770,356)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Sapphire: Earned 20,000,000 credits (34,158,496)SR5 LLR Turquoise: Earned 5,000,000 credits (8,205,166)SGS LLR Ruby: Earned 2,000,000 credits (2,011,264)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,046,112)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)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 Turquoise: Earned 5,000,000 credits (7,090,096)GFN Emerald: Earned 50,000,000 credits (64,594,991)PSA Jade: Earned 10,000,000 credits (10,135,447)
Message 129609 - Posted: 18 May 2019 | 19:49:19 UTC - in response to Message 129606.

My question is;

In which projects is posible to use Multi-thread? only cpu or gpu too? only LLR or sieve and GFN?

END383


Only LLR and the CPU version of GFN-21 support multi-threading.

On LLR, most people think it's not worthwhile to multi-thread on PPSE, PPS, or SGS, even though the program allows it. The small tasks aren't efficient when multi-threading.

Also, make sure you understand the difference between multi-threading and Hyper-threading. They're completely different. You asked about multi-threading. The answer I gave applies only to multi-threading.
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Endead383
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Joined: 3 Jan 19
Posts: 49
ID: 1090226
Credit: 1,333,424
RAC: 240
321 LLR Bronze: Earned 10,000 credits (11,081)PPS LLR Bronze: Earned 10,000 credits (37,343)SGS LLR Bronze: Earned 10,000 credits (56,997)321 Sieve Bronze: Earned 10,000 credits (12,198)PPS Sieve Silver: Earned 100,000 credits (128,098)AP 26/27 Gold: Earned 500,000 credits (521,547)GFN Gold: Earned 500,000 credits (549,439)
Message 129613 - Posted: 18 May 2019 | 22:11:47 UTC - in response to Message 129609.

What is Hyper theading? Thanks for your reponse

END383
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34945494^16384+1 (GFN 14) 123591 digits

Profile Michael GoetzProject donor
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Joined: 21 Jan 10
Posts: 12619
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Credit: 182,219,633
RAC: 19,391
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 Primes321 LLR Ruby: Earned 2,000,000 credits (2,063,182)Cullen LLR Ruby: Earned 2,000,000 credits (2,005,249)ESP LLR Ruby: Earned 2,000,000 credits (2,001,789)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,145,754)PPS LLR Ruby: Earned 2,000,000 credits (2,770,356)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Sapphire: Earned 20,000,000 credits (34,158,496)SR5 LLR Turquoise: Earned 5,000,000 credits (8,205,166)SGS LLR Ruby: Earned 2,000,000 credits (2,011,264)TRP LLR Ruby: Earned 2,000,000 credits (2,737,347)Woodall LLR Ruby: Earned 2,000,000 credits (2,195,123)321 Sieve Turquoise: Earned 5,000,000 credits (5,046,112)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (20,110,788)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 Turquoise: Earned 5,000,000 credits (7,090,096)GFN Emerald: Earned 50,000,000 credits (64,594,991)PSA Jade: Earned 10,000,000 credits (10,135,447)
Message 129614 - Posted: 18 May 2019 | 22:48:30 UTC - in response to Message 129613.

What is Hyper theading? Thanks for your reponse

END383


https://en.wikipedia.org/wiki/Hyper-threading

Short version:

While multi-threading is a software programing technique that allows a single program to either use multiple CPU cores to improve performance, or as a technique to allow a single program to do multiple tasks simultaneously, Hyper-threading is an Intel hardware feature that allows a single CPU core to run two threads simultaneously. It's not quite as good as having two full CPU cores, but it's better than having a single core. Some of the core's parts are duplicated for each thread, while some parts are shared between the threads. If a shared part is needed by both threads at the same time, one of them has to wait.

Its significance with regards to LLR is that one of the parts that is shared is the SIMD arithmetic unit -- the part that executes the SSE3, AVX, FMA and similar instructions. LLR uses these instructions heavily, so it gets no benefit from Hyper-threading. In fact, due to increased memory usage, using Hyper-threading slows down LLR not only by the 50% you would expect as a worst case scenario, but by more than that. You almost never want to use hyperthreads when running LLR.

____________
Please do not PM me with support questions. Ask on the forums instead. Thank you!

My lucky number is 75898524288+1

Endead383
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Joined: 3 Jan 19
Posts: 49
ID: 1090226
Credit: 1,333,424
RAC: 240
321 LLR Bronze: Earned 10,000 credits (11,081)PPS LLR Bronze: Earned 10,000 credits (37,343)SGS LLR Bronze: Earned 10,000 credits (56,997)321 Sieve Bronze: Earned 10,000 credits (12,198)PPS Sieve Silver: Earned 100,000 credits (128,098)AP 26/27 Gold: Earned 500,000 credits (521,547)GFN Gold: Earned 500,000 credits (549,439)
Message 129624 - Posted: 19 May 2019 | 17:52:25 UTC - in response to Message 129609.

You said LLR but sieve also? principally pps sieve
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34945494^16384+1 (GFN 14) 123591 digits

Profile Rafael
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Joined: 22 Oct 14
Posts: 846
ID: 370496
Credit: 277,298,615
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321 LLR Turquoise: Earned 5,000,000 credits (5,020,551)Cullen LLR Turquoise: Earned 5,000,000 credits (5,027,789)ESP LLR Ruby: Earned 2,000,000 credits (4,787,089)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,036,673)PPS LLR Turquoise: Earned 5,000,000 credits (5,870,467)PSP LLR Ruby: Earned 2,000,000 credits (4,883,788)SoB LLR Turquoise: Earned 5,000,000 credits (5,521,831)SR5 LLR Turquoise: Earned 5,000,000 credits (5,011,905)SGS LLR Turquoise: Earned 5,000,000 credits (5,059,759)TRP LLR Turquoise: Earned 5,000,000 credits (5,007,966)Woodall LLR Turquoise: Earned 5,000,000 credits (5,006,951)321 Sieve Silver: Earned 100,000 credits (414,112)Generalized Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (10,037,204)PPS Sieve Jade: Earned 10,000,000 credits (10,305,147)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,000,053)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (2,030,160)AP 26/27 Turquoise: Earned 5,000,000 credits (9,735,544)GFN Sapphire: Earned 20,000,000 credits (24,696,146)PSA Double Bronze: Earned 100,000,000 credits (161,845,481)
Message 129625 - Posted: 19 May 2019 | 18:07:21 UTC - in response to Message 129624.

You said LLR but sieve also? principally pps sieve

The sieve apps do not support Multi-Threading. They do, however, benefit from Hyper-Threading if your CPU has it.

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Message boards : Problems and Help : Multi-thread, is which tasks?

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