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Message boards : Extended Sierpinski Problem : 340 000 s CPU time on i7-4790K

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Bur
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Joined: 25 Feb 20
Posts: 30
ID: 1241833
Credit: 4,211,024
RAC: 31,564
ESP LLR Gold: Earned 500,000 credits (636,842)PPS LLR Silver: Earned 100,000 credits (415,283)SR5 LLR Gold: Earned 500,000 credits (531,145)SGS LLR Gold: Earned 500,000 credits (502,911)TRP LLR Bronze: Earned 10,000 credits (19,521)321 Sieve Ruby: Earned 2,000,000 credits (2,105,323)
Message 140113 - Posted: 7 May 2020 | 8:25:52 UTC
Last modified: 7 May 2020 | 8:28:34 UTC

I started ESP and found it took very long on both hosts, more than 300 000 s. What's more, the i7-4790K took 340 000 s, the i3-2120 took only 305 000 s approximately. SGS and 321 sieve, the i3 was usually 50% slower.

Unfortunately I had MT disabled and only now saw that it is reommended. What settings should I use?

I went with 50% of the processors and 2 threads, is that correct? Unfortunately these tasks take so long, you cannot really experiment.

Profile dannyridel
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Joined: 3 Feb 19
Posts: 487
ID: 1097922
Credit: 2,006,931
RAC: 1,986
321 LLR Bronze: Earned 10,000 credits (71,510)Cullen LLR Bronze: Earned 10,000 credits (36,962)ESP LLR Bronze: Earned 10,000 credits (36,309)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (22,373)PPS LLR Silver: Earned 100,000 credits (149,009)PSP LLR Bronze: Earned 10,000 credits (65,677)SoB LLR Bronze: Earned 10,000 credits (66,029)SR5 LLR Bronze: Earned 10,000 credits (48,432)SGS LLR Bronze: Earned 10,000 credits (21,194)TRP LLR Bronze: Earned 10,000 credits (39,419)Woodall LLR Bronze: Earned 10,000 credits (19,031)321 Sieve Silver: Earned 100,000 credits (190,894)Generalized Cullen/Woodall Sieve (suspended) Bronze: Earned 10,000 credits (30,033)PPS Sieve Gold: Earned 500,000 credits (600,038)AP 26/27 Bronze: Earned 10,000 credits (52,559)GFN Silver: Earned 100,000 credits (189,280)PSA Silver: Earned 100,000 credits (368,183)
Message 140114 - Posted: 7 May 2020 | 9:07:16 UTC - in response to Message 140113.
Last modified: 7 May 2020 | 9:09:05 UTC

MT all the cores you have available for crunching;
Or use Prime95 to test the FFT size ESP has.
See here for instructions.
http://www.primegrid.com/forum_thread.php?id=8240
____________
JonDan School Services
GFN-14: 50103906^16384+1
AP 21: 104383195353409757+142406036*23#*n for n=0..20

Bur
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Joined: 25 Feb 20
Posts: 30
ID: 1241833
Credit: 4,211,024
RAC: 31,564
ESP LLR Gold: Earned 500,000 credits (636,842)PPS LLR Silver: Earned 100,000 credits (415,283)SR5 LLR Gold: Earned 500,000 credits (531,145)SGS LLR Gold: Earned 500,000 credits (502,911)TRP LLR Bronze: Earned 10,000 credits (19,521)321 Sieve Ruby: Earned 2,000,000 credits (2,105,323)
Message 140124 - Posted: 7 May 2020 | 14:45:20 UTC
Last modified: 7 May 2020 | 15:02:14 UTC

Thanks for the link.

So far it seems restricting to physical cores and MT=2 has done a lot of good. Two ESP tasks are running on the i7 with one giving an estimate of 70 000 s, the other something like 130 000 s.

According to taskmanager one process utilizes 25% of cpu ressources, the other 12-13%. I changed MT to 1 to prepare for SGS tasks and it might be one ESP task is running with this setting?

I did prime95 test and 1 worker was optimal in terms of throughput. The posts said a worker was the same as a task, so it wouldn't tell about the optimal number of threads?

Anyway, after pausing/unpausing Boinc, now both ESP tasks are running at 25% CPU each. So apparently it wasn't related to the MT setting.

What are other people using on a 4 physical cores i7? How many threads?

Werinbert
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Joined: 9 Jun 13
Posts: 92
ID: 233452
Credit: 160,421,562
RAC: 100,866
321 LLR Gold: Earned 500,000 credits (533,081)Cullen LLR Gold: Earned 500,000 credits (529,186)ESP LLR Gold: Earned 500,000 credits (513,315)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (521,209)PPS LLR Turquoise: Earned 5,000,000 credits (5,342,831)PSP LLR Gold: Earned 500,000 credits (566,492)SoB LLR Gold: Earned 500,000 credits (597,244)SR5 LLR Gold: Earned 500,000 credits (609,158)SGS LLR Gold: Earned 500,000 credits (503,589)TRP LLR Gold: Earned 500,000 credits (542,295)Woodall LLR Gold: Earned 500,000 credits (615,831)321 Sieve Ruby: Earned 2,000,000 credits (3,378,763)Generalized Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,101,470)PPS Sieve Double Bronze: Earned 100,000,000 credits (100,344,557)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Gold: Earned 500,000 credits (715,073)TRP Sieve (suspended) Gold: Earned 500,000 credits (630,833)AP 26/27 Turquoise: Earned 5,000,000 credits (7,552,324)GFN Sapphire: Earned 20,000,000 credits (33,563,270)PSA Ruby: Earned 2,000,000 credits (2,262,901)
Message 140126 - Posted: 7 May 2020 | 16:31:16 UTC

On my i7 3770k (4 core/8 thread) I have set multi-threading to 4 and left hyper-threading on. So I am running two tasks simultaneously. Not the most efficient but it works for me. But each person should run a few tests to see what settings works best for them as hardware variations can make a significant difference (AVX capability or cache size for examples).

On my Ryzen 3700X (8 core/16 thread) I set multi-threading to 4 or 8 depending on how long the tasks are expected to run. Again I leave hyper-threading on. Using 4 cores makes the computer more responsive to other projects I have going on as I am often running PG as the backup project and I prefer it not to hog my CPU resources if possible.

For GFN21/22, however, I have app_config set to use all my cores as they are monster tasks. [GPU is highly recommended, but I am a masochist.]
____________
Werinbert is not prime... or PRPnet keeps telling me so.
Badge score: 2x2 + 10x3 + 2x4 + 3x5 + 1x8 + 1x9 = 74

mackerelProject donor
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Joined: 2 Oct 08
Posts: 2354
ID: 29980
Credit: 408,572,698
RAC: 93,431
Discovered 2 mega primesEliminated 1 conjecture "k"Found 3 primes in the 2018 Tour de PrimesFound 1 mega prime in the 2018 Tour de PrimesFound 5 primes in the 2019 Tour de PrimesFound 6 primes in the 2020 Tour de Primes321 LLR Turquoise: Earned 5,000,000 credits (8,774,878)Cullen LLR Turquoise: Earned 5,000,000 credits (5,149,818)ESP LLR Turquoise: Earned 5,000,000 credits (6,454,573)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,122,074)PPS LLR Emerald: Earned 50,000,000 credits (71,949,476)PSP LLR Jade: Earned 10,000,000 credits (15,223,714)SoB LLR Jade: Earned 10,000,000 credits (17,319,914)SR5 LLR Sapphire: Earned 20,000,000 credits (23,993,013)SGS LLR Turquoise: Earned 5,000,000 credits (7,333,201)TPS LLR (retired) Bronze: Earned 10,000 credits (34,130)TRP LLR Jade: Earned 10,000,000 credits (16,460,208)Woodall LLR Turquoise: Earned 5,000,000 credits (5,715,464)321 Sieve Jade: Earned 10,000,000 credits (18,014,408)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,383,853)Generalized Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,626,419)PPS Sieve Emerald: Earned 50,000,000 credits (76,965,773)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,293,882)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,012,757)AP 26/27 Sapphire: Earned 20,000,000 credits (21,918,894)GFN Emerald: Earned 50,000,000 credits (71,886,552)PSA Ruby: Earned 2,000,000 credits (2,939,755)
Message 140131 - Posted: 7 May 2020 | 17:37:46 UTC

For "big" units like this, it is generally good to use 1 task using as many threads as you have real cores with Intel CPUs. It can get more complicated on AMD side.

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Message boards : Extended Sierpinski Problem : 340 000 s CPU time on i7-4790K

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