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Message boards : General discussion : Run Time VS CPU Time?

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allenout
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Joined: 23 Jun 19
Posts: 7
ID: 1144344
Credit: 1,333,016
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321 LLR Bronze: Earned 10,000 credits (51,596)Cullen LLR Silver: Earned 100,000 credits (110,160)ESP LLR Silver: Earned 100,000 credits (107,259)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (103,914)PPS LLR Silver: Earned 100,000 credits (125,540)PSP LLR Silver: Earned 100,000 credits (193,878)SGS LLR Bronze: Earned 10,000 credits (26,982)TRP LLR Bronze: Earned 10,000 credits (48,329)PPS Sieve Silver: Earned 100,000 credits (357,326)AP 26/27 Silver: Earned 100,000 credits (101,075)GFN Silver: Earned 100,000 credits (100,858)
Message 137586 - Posted: 9 Feb 2020 | 6:36:56 UTC

What is the difference between Run Time and CPU Time?

Profile Chase Tarson
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Joined: 14 Jun 12
Posts: 12
ID: 144212
Credit: 80,336,020
RAC: 190
Cullen LLR Bronze: Earned 10,000 credits (18,010)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (21,828)PPS LLR Gold: Earned 500,000 credits (547,352)SGS LLR Silver: Earned 100,000 credits (161,770)TRP LLR Bronze: Earned 10,000 credits (23,294)321 Sieve Sapphire: Earned 20,000,000 credits (28,206,571)PPS Sieve Sapphire: Earned 20,000,000 credits (29,071,504)AP 26/27 Sapphire: Earned 20,000,000 credits (21,512,803)GFN Gold: Earned 500,000 credits (758,432)PSA Bronze: Earned 10,000 credits (10,620)
Message 137587 - Posted: 9 Feb 2020 | 6:43:39 UTC

Run Time is the amount of time the workunit has been running.

CPU Time is the amount of time the CPU has actively been working on the workunit.

As these workunits are using the idle cycles of the CPU, throughout the day there are other processes that will take the CPU time from the workunit, so you'll see Run Time being longer than the CPU Time.

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Volunteer tester
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Joined: 16 Feb 10
Posts: 750
ID: 55391
Credit: 638,558,709
RAC: 446,833
Discovered 2 mega primesFound 1 prime in the 2018 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (5,477,467)Cullen LLR Gold: Earned 500,000 credits (776,297)ESP LLR Ruby: Earned 2,000,000 credits (3,120,351)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,056,207)PPS LLR Jade: Earned 10,000,000 credits (16,510,109)PSP LLR Turquoise: Earned 5,000,000 credits (5,027,818)SoB LLR Sapphire: Earned 20,000,000 credits (21,727,530)SR5 LLR Turquoise: Earned 5,000,000 credits (6,110,877)SGS LLR Ruby: Earned 2,000,000 credits (3,476,666)TRP LLR Turquoise: Earned 5,000,000 credits (7,025,303)Woodall LLR Amethyst: Earned 1,000,000 credits (1,693,614)321 Sieve Sapphire: Earned 20,000,000 credits (32,102,823)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,571,178)Generalized Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (50,009,610)PPS Sieve Double Silver: Earned 200,000,000 credits (285,514,208)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Jade: Earned 10,000,000 credits (10,165,888)TRP Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,071,454)AP 26/27 Turquoise: Earned 5,000,000 credits (6,616,128)GFN Emerald: Earned 50,000,000 credits (52,755,348)PSA Double Bronze: Earned 100,000,000 credits (102,762,384)
Message 137591 - Posted: 9 Feb 2020 | 8:45:15 UTC - in response to Message 137587.

Run Time is the amount of time the workunit has been running.

CPU Time is the amount of time the CPU has actively been working on the workunit.

As these workunits are using the idle cycles of the CPU, throughout the day there are other processes that will take the CPU time from the workunit, so you'll see Run Time being longer than the CPU Time.

But when using multi-threading, more than one CPU core can work on a task simultaneously. In this case the CPU time is more likely to exceed the Run Time because the CPU Time shown is actually the total time of all the threads working on the task, and the simultaneous computation of multiple threads reduces the Run Time.

Since energy consumption is directly related to CPU time, multi-threading causes more energy to be used to get the same result sooner.

Profile firedrakes
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Joined: 7 Feb 09
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ID: 35268
Credit: 34,430,394
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321 LLR Gold: Earned 500,000 credits (878,090)Cullen LLR Bronze: Earned 10,000 credits (56,880)ESP LLR Gold: Earned 500,000 credits (920,612)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (273,624)PPS LLR Ruby: Earned 2,000,000 credits (2,123,304)PSP LLR Silver: Earned 100,000 credits (104,325)SoB LLR Silver: Earned 100,000 credits (109,708)SR5 LLR Gold: Earned 500,000 credits (983,230)SGS LLR Amethyst: Earned 1,000,000 credits (1,246,040)TRP LLR Bronze: Earned 10,000 credits (22,755)Woodall LLR Silver: Earned 100,000 credits (117,458)321 Sieve Turquoise: Earned 5,000,000 credits (5,746,930)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (480,693)Generalized Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,644,320)PPS Sieve Ruby: Earned 2,000,000 credits (4,259,711)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (16,303)AP 26/27 Gold: Earned 500,000 credits (870,181)GFN Jade: Earned 10,000,000 credits (14,575,333)
Message 137848 - Posted: 13 Feb 2020 | 21:52:38 UTC - in response to Message 137591.

i would like a clearer info on this for choosing wu list.

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Message boards : General discussion : Run Time VS CPU Time?

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