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Message boards : 321 Prime Search : Hyperthreading turned off and then on possibly caused error

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NickProject donor
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Joined: 11 Jul 11
Posts: 40
ID: 105020
Credit: 48,270,426
RAC: 0
321 LLR Gold: Earned 500,000 credits (502,329)Cullen LLR Silver: Earned 100,000 credits (206,303)PPS LLR Gold: Earned 500,000 credits (509,114)PSP LLR Gold: Earned 500,000 credits (504,200)SoB LLR Gold: Earned 500,000 credits (507,075)SR5 LLR Silver: Earned 100,000 credits (120,126)SGS LLR Silver: Earned 100,000 credits (210,094)TRP LLR Silver: Earned 100,000 credits (112,271)Woodall LLR Gold: Earned 500,000 credits (513,670)Cullen/Woodall Sieve (suspended) Gold: Earned 500,000 credits (744,531)PPS Sieve Sapphire: Earned 20,000,000 credits (40,310,636)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,181)GFN Ruby: Earned 2,000,000 credits (4,008,895)
Message 70787 - Posted: 10 Nov 2013 | 11:04:05 UTC

On 1 computer, I just had all 8 of my 321 run to the end and with error. I played with my hyperthreading setting in the bios recently - turned it off. Ah, now its only running 4 of the 321 tasks. So I turned it back on again. I am reasonably sure that it was these tasks that completed with error. I will be turning off hperthreading when all my tasks are complete as I am reasonably sure they run approx twice as fast. (I will know for sure when I run tasks to completion with hyperthreading turned off) I would rather get less tasks done more quickly and I am sure prime grid would prefer that too.

Paul Underwood
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Joined: 14 Jul 08
Posts: 56
ID: 25545
Credit: 3,455,122
RAC: 4,524
321 LLR Ruby: Earned 2,000,000 credits (3,428,218)PSA Bronze: Earned 10,000 credits (22,365)
Message 70788 - Posted: 10 Nov 2013 | 12:24:28 UTC - in response to Message 70787.
Last modified: 10 Nov 2013 | 12:27:15 UTC

I run with HT off in the belief that it produces less heat.

Over ssh, I noticed X was leaking on the Slax box connected to PG. So I rebooted it remotely. Consequently I lost some tests that were waiting to communicate with PG and some that were 90% done. The next time I get a leak, I will locally suspend the tasks and then reboot the Slax box.

R.Stanneveld
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Joined: 5 Nov 08
Posts: 10
ID: 31310
Credit: 371,491,871
RAC: 0
SGS LLR Bronze: Earned 10,000 credits (28,857)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (221,574)PPS Sieve Double Silver: Earned 200,000,000 credits (371,195,572)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (13,073)GFN Bronze: Earned 10,000 credits (30,920)
Message 77808 - Posted: 3 Jul 2014 | 1:20:25 UTC

4 corers 25 minutes WU (Germaine)
HT on 8 cores 40 minutes WU (Germaine)

HT on is faster
____________

Michael GoetzProject donor
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Project scientist
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Joined: 21 Jan 10
Posts: 9357
ID: 53948
Credit: 101,574,811
RAC: 18,979
321 LLR Amethyst: Earned 1,000,000 credits (1,152,064)Cullen LLR Amethyst: Earned 1,000,000 credits (1,157,331)ESP LLR Amethyst: Earned 1,000,000 credits (1,179,211)Generalized Cullen/Woodall LLR Amethyst: Earned 1,000,000 credits (1,330,821)PPS LLR Amethyst: Earned 1,000,000 credits (1,252,364)PSP LLR Ruby: Earned 2,000,000 credits (2,632,269)SoB LLR Ruby: Earned 2,000,000 credits (2,067,903)SR5 LLR Turquoise: Earned 5,000,000 credits (5,922,947)SGS LLR Amethyst: Earned 1,000,000 credits (1,680,461)TRP LLR Amethyst: Earned 1,000,000 credits (1,009,313)Woodall LLR Amethyst: Earned 1,000,000 credits (1,145,077)321 Sieve (suspended) Silver: Earned 100,000 credits (200,576)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (2,085,723)PPS Sieve Jade: Earned 10,000,000 credits (18,162,350)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 (5,877,196)GFN Sapphire: Earned 20,000,000 credits (38,036,953)PSA Turquoise: Earned 5,000,000 credits (9,426,791)
Message 77809 - Posted: 3 Jul 2014 | 1:36:29 UTC - in response to Message 77808.

4 corers 25 minutes WU (Germaine)
HT on 8 cores 40 minutes WU (Germaine)

HT on is faster


One thing I always try to tell people asking for advice is that every computer is different and they should test it on their hardware.

That's what you did -- and now you know for certain which is faster on that machine.

One additional word of advice: the results you see for SGS might not be the same as for other tasks. SGS is the second shortest of the LLR tasks, and it's possible that longer tasks will behave differently.
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Please do not PM me with support questions. They will usually go unanswered. Ask on the forums instead. Thank you!

Miklos M.
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Joined: 14 Apr 12
Posts: 285
ID: 138455
Credit: 3,479,452,072
RAC: 2,151,203
321 LLR Amethyst: Earned 1,000,000 credits (1,192,044)Cullen LLR Gold: Earned 500,000 credits (800,070)ESP LLR Amethyst: Earned 1,000,000 credits (1,090,723)PPS LLR Amethyst: Earned 1,000,000 credits (1,791,017)SoB LLR Silver: Earned 100,000 credits (275,446)SR5 LLR Amethyst: Earned 1,000,000 credits (1,373,362)SGS LLR Amethyst: Earned 1,000,000 credits (1,173,846)TRP LLR Amethyst: Earned 1,000,000 credits (1,474,442)Woodall LLR Gold: Earned 500,000 credits (624,562)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,036,945)Generalized Cullen/Woodall Sieve Sapphire: Earned 20,000,000 credits (21,220,871)PPS Sieve Double Ruby: Earned 2,000,000,000 credits (3,332,560,487)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (46,622,519)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (32,704,392)GFN Sapphire: Earned 20,000,000 credits (32,526,466)
Message 83074 - Posted: 30 Jan 2015 | 17:25:52 UTC

I agree, with HT off my ESP, PPS and PPSE LLR runs faster, but not the SR5 units.

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Message boards : 321 Prime Search : Hyperthreading turned off and then on possibly caused error

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