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Message boards : Cullen/Woodall prime search : Win64 gcwsieve slowdown

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JohnProject donor
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Joined: 21 Feb 06
Posts: 2876
ID: 2449
Credit: 2,681,934
RAC: 0
321 LLR Bronze: Earned 10,000 credits (11,773)Cullen LLR Bronze: Earned 10,000 credits (14,945)ESP LLR Bronze: Earned 10,000 credits (26,855)PPS LLR Bronze: Earned 10,000 credits (84,876)PSP LLR Bronze: Earned 10,000 credits (15,311)SoB LLR Bronze: Earned 10,000 credits (21,440)SR5 LLR Bronze: Earned 10,000 credits (29,270)SGS LLR Bronze: Earned 10,000 credits (26,616)TPS LLR (retired) Bronze: Earned 10,000 credits (36,288)TRP LLR Bronze: Earned 10,000 credits (41,655)Woodall LLR Bronze: Earned 10,000 credits (15,807)321 Sieve (suspended) Bronze: Earned 10,000 credits (20,014)Cullen/Woodall Sieve (suspended) Bronze: Earned 10,000 credits (23,405)PPS Sieve Bronze: Earned 10,000 credits (36,192)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (20,306)TRP Sieve (suspended) Bronze: Earned 10,000 credits (21,738)GFN Bronze: Earned 10,000 credits (86,217)PSA Ruby: Earned 2,000,000 credits (2,143,756)
Message 19342 - Posted: 25 Nov 2009 | 3:54:01 UTC

We are attempting to discover why there is a slowdown when using the Win64 gcwsieve build on a multi-core machine. Please post your CPU specs here and whether or not your machine is affected by the slowdown.
____________

LumiukkoProject donor
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Joined: 7 Jul 08
Posts: 144
ID: 25183
Credit: 457,319,958
RAC: 208,943
321 LLR Turquoise: Earned 5,000,000 credits (5,007,023)Cullen LLR Turquoise: Earned 5,000,000 credits (5,045,556)ESP LLR Turquoise: Earned 5,000,000 credits (5,017,963)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,374,641)PPS LLR Turquoise: Earned 5,000,000 credits (6,575,428)PSP LLR Turquoise: Earned 5,000,000 credits (8,116,430)SoB LLR Turquoise: Earned 5,000,000 credits (5,264,074)SR5 LLR Turquoise: Earned 5,000,000 credits (5,272,890)SGS LLR Turquoise: Earned 5,000,000 credits (5,205,437)TPS LLR (retired) Bronze: Earned 10,000 credits (22,572)TRP LLR Turquoise: Earned 5,000,000 credits (5,067,456)Woodall LLR Ruby: Earned 2,000,000 credits (4,956,292)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,863,629)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,878,933)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (6,055,601)PPS Sieve Emerald: Earned 50,000,000 credits (56,028,730)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,273)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,752,023)AP 26/27 Emerald: Earned 50,000,000 credits (50,128,318)GFN Emerald: Earned 50,000,000 credits (50,169,068)PSA Double Silver: Earned 200,000,000 credits (218,505,114)
Message 19349 - Posted: 25 Nov 2009 | 6:02:30 UTC - in response to Message 19342.

Xeon E5345@2,33GHz, 16GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Xeon E5345@2,33GHz, 12GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Xeon E5410@2,33GHz, 12GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Running gcwsieve 1.12 in all 8 cores.

Speed is 50% slower than with my Linux machines.

--
Lumiukko

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Joined: 25 Aug 06
Posts: 11
ID: 3321
Credit: 32,569,298
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321 LLR Silver: Earned 100,000 credits (274,178)Cullen LLR Bronze: Earned 10,000 credits (78,139)PPS LLR Silver: Earned 100,000 credits (199,912)PSP LLR Silver: Earned 100,000 credits (111,243)SoB LLR Silver: Earned 100,000 credits (102,953)SGS LLR Silver: Earned 100,000 credits (193,643)TRP LLR Bronze: Earned 10,000 credits (45,917)Woodall LLR Silver: Earned 100,000 credits (104,205)321 Sieve (suspended) Silver: Earned 100,000 credits (320,611)Cullen/Woodall Sieve (suspended) Silver: Earned 100,000 credits (202,314)PPS Sieve Sapphire: Earned 20,000,000 credits (23,615,568)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,197,266)TRP Sieve (suspended) Silver: Earned 100,000 credits (473,383)AP 26/27 Silver: Earned 100,000 credits (229,873)PSA Turquoise: Earned 5,000,000 credits (5,401,800)
Message 19350 - Posted: 25 Nov 2009 | 7:10:54 UTC

i7 CPU 920 @ 3.60GHz 6GB ~ 10,700sec
i7 CPU 920 @ 3.80GHz 6GB ~ 10,200sec
A 64 FX-70 @ 3.0GHz 4GB ~ 10,100sec
X2 6000+ @ 3.0GHz 2GB ~ 9,900sec
PhenomII 955@3.6GHz 4GB~ 8,400sec

All running XPpro64 with boinc 6.10.17/18
slow down? beats me... could be, credit seems a little light compared
to pps or psp sieve.




Fish
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Credit: 169,973,850
RAC: 3
321 LLR Ruby: Earned 2,000,000 credits (2,050,307)Cullen LLR Ruby: Earned 2,000,000 credits (2,152,865)PPS LLR Turquoise: Earned 5,000,000 credits (5,681,659)PSP LLR Ruby: Earned 2,000,000 credits (2,322,933)SoB LLR Ruby: Earned 2,000,000 credits (2,263,868)SGS LLR Ruby: Earned 2,000,000 credits (3,119,299)TPS LLR (retired) Amethyst: Earned 1,000,000 credits (1,041,654)TRP LLR Ruby: Earned 2,000,000 credits (2,232,130)Woodall LLR Ruby: Earned 2,000,000 credits (2,070,526)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,845,975)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,092,749)PPS Sieve Double Bronze: Earned 100,000,000 credits (115,126,417)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Ruby: Earned 2,000,000 credits (2,518,445)TRP Sieve (suspended) Ruby: Earned 2,000,000 credits (4,480,970)AP 26/27 Ruby: Earned 2,000,000 credits (2,546,111)PSA Jade: Earned 10,000,000 credits (14,428,040)
Message 19352 - Posted: 25 Nov 2009 | 9:26:38 UTC - in response to Message 19350.

Probably a problem on quads:

E6700 @2.67GHz : 7300 s/wu
T7600 @2.33GHz : 8600 s/wu
Q6600 @2.40GHz : 12500 s/wu

The 3 with Vista 64 an GWsieve 1.12, the e6700 an q6600 have graphic cards running other Boinc projects, but when stopping gpu, no significant speed up on cpu tasks.

LumiukkoProject donor
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Joined: 7 Jul 08
Posts: 144
ID: 25183
Credit: 457,319,958
RAC: 208,943
321 LLR Turquoise: Earned 5,000,000 credits (5,007,023)Cullen LLR Turquoise: Earned 5,000,000 credits (5,045,556)ESP LLR Turquoise: Earned 5,000,000 credits (5,017,963)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,374,641)PPS LLR Turquoise: Earned 5,000,000 credits (6,575,428)PSP LLR Turquoise: Earned 5,000,000 credits (8,116,430)SoB LLR Turquoise: Earned 5,000,000 credits (5,264,074)SR5 LLR Turquoise: Earned 5,000,000 credits (5,272,890)SGS LLR Turquoise: Earned 5,000,000 credits (5,205,437)TPS LLR (retired) Bronze: Earned 10,000 credits (22,572)TRP LLR Turquoise: Earned 5,000,000 credits (5,067,456)Woodall LLR Ruby: Earned 2,000,000 credits (4,956,292)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,863,629)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,878,933)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (6,055,601)PPS Sieve Emerald: Earned 50,000,000 credits (56,028,730)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,273)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,752,023)AP 26/27 Emerald: Earned 50,000,000 credits (50,128,318)GFN Emerald: Earned 50,000,000 credits (50,169,068)PSA Double Silver: Earned 200,000,000 credits (218,505,114)
Message 19358 - Posted: 25 Nov 2009 | 15:26:25 UTC - in response to Message 19349.

Xeon E5345@2,33GHz, 16GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Xeon E5345@2,33GHz, 12GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Xeon E5410@2,33GHz, 12GB RAM, Win7, Boinc 6.10.18, ~23000 s/wu
Running gcwsieve 1.12 in all 8 cores.

Speed is 50% slower than with my Linux machines.

--
Lumiukko


Had wrong OS in the E5410 row above. Correct one is:
Xeon E5410@2,33GHz, 12GB RAM, Server 2003 R2 x64, Boinc 6.10.18, ~23000 s/wu


--
Lumiukko

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Joined: 5 Sep 07
Posts: 36
ID: 11850
Credit: 505,638,340
RAC: 335,475
321 LLR Turquoise: Earned 5,000,000 credits (5,000,199)Cullen LLR Ruby: Earned 2,000,000 credits (4,990,303)ESP LLR Ruby: Earned 2,000,000 credits (2,273,023)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (842,249)PPS LLR Ruby: Earned 2,000,000 credits (3,400,826)PSP LLR Ruby: Earned 2,000,000 credits (3,702,549)SoB LLR Ruby: Earned 2,000,000 credits (2,230,393)SR5 LLR Ruby: Earned 2,000,000 credits (2,100,879)SGS LLR Ruby: Earned 2,000,000 credits (2,283,550)TPS LLR (retired) Bronze: Earned 10,000 credits (21,185)TRP LLR Turquoise: Earned 5,000,000 credits (5,011,402)Woodall LLR Turquoise: Earned 5,000,000 credits (5,068,778)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,236,155)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (6,528,158)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (4,395,356)PPS Sieve Double Silver: Earned 200,000,000 credits (398,745,931)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,015,377)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,038,856)AP 26/27 Ruby: Earned 2,000,000 credits (3,648,439)GFN Sapphire: Earned 20,000,000 credits (32,923,868)PSA Jade: Earned 10,000,000 credits (11,190,400)
Message 19359 - Posted: 25 Nov 2009 | 15:26:54 UTC
Last modified: 25 Nov 2009 | 15:40:48 UTC

X6800 @ 2.93 GHz 6300 - 7000 s/wu
Q9300 @ 2.5 GHz 7500 - 8000 s/wu

Not running on all cores at once.

To see if it will make any difference I've set all my 64 bit machines to run CWSieve on all cores for 24 hours as a test. Will post here with times when testing is completed.

LumiukkoProject donor
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Joined: 7 Jul 08
Posts: 144
ID: 25183
Credit: 457,319,958
RAC: 208,943
321 LLR Turquoise: Earned 5,000,000 credits (5,007,023)Cullen LLR Turquoise: Earned 5,000,000 credits (5,045,556)ESP LLR Turquoise: Earned 5,000,000 credits (5,017,963)Generalized Cullen/Woodall LLR Ruby: Earned 2,000,000 credits (2,374,641)PPS LLR Turquoise: Earned 5,000,000 credits (6,575,428)PSP LLR Turquoise: Earned 5,000,000 credits (8,116,430)SoB LLR Turquoise: Earned 5,000,000 credits (5,264,074)SR5 LLR Turquoise: Earned 5,000,000 credits (5,272,890)SGS LLR Turquoise: Earned 5,000,000 credits (5,205,437)TPS LLR (retired) Bronze: Earned 10,000 credits (22,572)TRP LLR Turquoise: Earned 5,000,000 credits (5,067,456)Woodall LLR Ruby: Earned 2,000,000 credits (4,956,292)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (2,863,629)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,878,933)Generalized Cullen/Woodall Sieve Turquoise: Earned 5,000,000 credits (6,055,601)PPS Sieve Emerald: Earned 50,000,000 credits (56,028,730)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,018,273)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,752,023)AP 26/27 Emerald: Earned 50,000,000 credits (50,128,318)GFN Emerald: Earned 50,000,000 credits (50,169,068)PSA Double Silver: Earned 200,000,000 credits (218,505,114)
Message 19372 - Posted: 26 Nov 2009 | 11:35:59 UTC - in response to Message 19358.

Dual Xeon E5410@2,33GHz, 12GB RAM, Server 2003 R2 x64, Boinc 6.10.18, ~23000 s/wu (when running all cores = 8 wu's)

Dual Xeon E5410@2,33GHz, 12GB RAM, Server 2003 R2 x64, Boinc 6.10.18, ~11600 s/wu (when running only 4 wu's)

--
Lumiukko

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Joined: 5 Sep 07
Posts: 36
ID: 11850
Credit: 505,638,340
RAC: 335,475
321 LLR Turquoise: Earned 5,000,000 credits (5,000,199)Cullen LLR Ruby: Earned 2,000,000 credits (4,990,303)ESP LLR Ruby: Earned 2,000,000 credits (2,273,023)Generalized Cullen/Woodall LLR Gold: Earned 500,000 credits (842,249)PPS LLR Ruby: Earned 2,000,000 credits (3,400,826)PSP LLR Ruby: Earned 2,000,000 credits (3,702,549)SoB LLR Ruby: Earned 2,000,000 credits (2,230,393)SR5 LLR Ruby: Earned 2,000,000 credits (2,100,879)SGS LLR Ruby: Earned 2,000,000 credits (2,283,550)TPS LLR (retired) Bronze: Earned 10,000 credits (21,185)TRP LLR Turquoise: Earned 5,000,000 credits (5,011,402)Woodall LLR Turquoise: Earned 5,000,000 credits (5,068,778)321 Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,236,155)Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (6,528,158)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (4,395,356)PPS Sieve Double Silver: Earned 200,000,000 credits (398,745,931)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,015,377)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,038,856)AP 26/27 Ruby: Earned 2,000,000 credits (3,648,439)GFN Sapphire: Earned 20,000,000 credits (32,923,868)PSA Jade: Earned 10,000,000 credits (11,190,400)
Message 19377 - Posted: 26 Nov 2009 | 14:24:28 UTC - in response to Message 19359.

X6800 @ 2.93 GHz 6300 - 7000 s/wu
Q9300 @ 2.5 GHz 7500 - 8000 s/wu

Not running on all cores at once.

To see if it will make any difference I've set all my 64 bit machines to run CWSieve on all cores for 24 hours as a test. Will post here with times when testing is completed.


Testing results:

X6800 @ 2.93 GHz 7500 - 8000s/wu running on both cores.

Q9300 @ 2.5 GHz 10000 - 11000 s/wu running on all 4 cores.

PD930 @ 3GHz 22000 s/wu running on both cores or on a single core.

Running Boinc 5.10.45 on all boxes.

PilgrimProject donor
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Credit: 50,849,257
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321 LLR Bronze: Earned 10,000 credits (12,741)ESP LLR Silver: Earned 100,000 credits (169,763)PPS LLR Silver: Earned 100,000 credits (224,192)PSP LLR Bronze: Earned 10,000 credits (15,410)SGS LLR Silver: Earned 100,000 credits (199,385)Cullen/Woodall Sieve (suspended) Bronze: Earned 10,000 credits (26,798)PPS Sieve Sapphire: Earned 20,000,000 credits (20,785,718)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Bronze: Earned 10,000 credits (71,598)AP 26/27 Silver: Earned 100,000 credits (287,805)GFN Amethyst: Earned 1,000,000 credits (1,330,607)PSA Sapphire: Earned 20,000,000 credits (27,702,436)
Message 19386 - Posted: 27 Nov 2009 | 6:01:34 UTC - in response to Message 19377.



i7-860@2.8G, 4 cores(8 threads),
Windows 7 64 bit, 6MB memory tri-channel >>>>


7 threads -- ~11,000 s/unit

5 threads -- ~10,500 s/unit

1 thread ---- ~7,050 s/unit

Profile valtercProject donor
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Joined: 30 May 07
Posts: 117
ID: 8810
Credit: 2,897,608,260
RAC: 717,445
321 LLR Gold: Earned 500,000 credits (666,046)Cullen LLR Gold: Earned 500,000 credits (557,609)ESP LLR Ruby: Earned 2,000,000 credits (2,021,061)PPS LLR Ruby: Earned 2,000,000 credits (2,109,953)PSP LLR Gold: Earned 500,000 credits (557,715)SoB LLR Gold: Earned 500,000 credits (554,528)SR5 LLR Ruby: Earned 2,000,000 credits (2,019,335)SGS LLR Ruby: Earned 2,000,000 credits (2,131,335)TPS LLR (retired) Bronze: Earned 10,000 credits (20,001)TRP LLR Ruby: Earned 2,000,000 credits (2,017,688)Woodall LLR Gold: Earned 500,000 credits (559,938)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (4,028,711)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,247,691)Generalized Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (14,004,302)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,339,859,207)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (36,215,460)TRP Sieve (suspended) Double Bronze: Earned 100,000,000 credits (102,264,922)AP 26/27 Jade: Earned 10,000,000 credits (18,750,723)GFN Turquoise: Earned 5,000,000 credits (5,192,662)PSA Double Amethyst: Earned 1,000,000,000 credits (1,343,866,777)
Message 19389 - Posted: 27 Nov 2009 | 18:23:30 UTC - in response to Message 19386.

I didn't find any slowdown on a dual core (e8400, running a task per core), but on a quad (q9450, 4 tasks at the same time), yes, it's really slow (something like 40% slower). Both computers run W764u... strange...

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Posts: 195
ID: 17041
Credit: 28,990,139
RAC: 6,727
321 LLR Silver: Earned 100,000 credits (265,132)Cullen LLR Gold: Earned 500,000 credits (515,348)ESP LLR Gold: Earned 500,000 credits (502,531)Generalized Cullen/Woodall LLR Silver: Earned 100,000 credits (119,274)PPS LLR Ruby: Earned 2,000,000 credits (2,015,670)PSP LLR Gold: Earned 500,000 credits (664,246)SoB LLR Silver: Earned 100,000 credits (252,144)SR5 LLR Gold: Earned 500,000 credits (525,385)SGS LLR Amethyst: Earned 1,000,000 credits (1,107,215)TPS LLR (retired) Bronze: Earned 10,000 credits (30,981)TRP LLR Silver: Earned 100,000 credits (437,847)Woodall LLR Gold: Earned 500,000 credits (502,434)321 Sieve (suspended) Silver: Earned 100,000 credits (204,804)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (2,919,475)Generalized Cullen/Woodall Sieve Gold: Earned 500,000 credits (586,017)PPS Sieve Jade: Earned 10,000,000 credits (13,942,021)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Gold: Earned 500,000 credits (712,299)TRP Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,064,240)AP 26/27 Gold: Earned 500,000 credits (514,823)GFN Amethyst: Earned 1,000,000 credits (1,481,942)PSA Gold: Earned 500,000 credits (625,449)
Message 19393 - Posted: 27 Nov 2009 | 21:51:38 UTC
Last modified: 27 Nov 2009 | 21:52:13 UTC

C2Q Q6600@2,4GHz, 8GB RAM, Win7x64, Boinc 6.10.18, ~8500 s/wu, 4 tasks at same time
C2Q Q6600@2,4GHz, 8GB RAM, Ubuntu x64 , Boinc 6.10.17, ~9200 s/wu 4 tasks at same time

Both are running a GPU/CUDA apps at the same time.

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Posts: 778
ID: 85
Credit: 175,774,608
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321 LLR Silver: Earned 100,000 credits (186,594)Cullen LLR Silver: Earned 100,000 credits (106,665)ESP LLR Gold: Earned 500,000 credits (502,416)PPS LLR Gold: Earned 500,000 credits (504,111)PSP LLR Gold: Earned 500,000 credits (513,785)SoB LLR Gold: Earned 500,000 credits (564,944)SR5 LLR Ruby: Earned 2,000,000 credits (2,790,118)SGS LLR Gold: Earned 500,000 credits (501,099)TPS LLR (retired) Bronze: Earned 10,000 credits (46,235)TRP LLR Gold: Earned 500,000 credits (708,706)Woodall LLR Silver: Earned 100,000 credits (133,626)321 Sieve (suspended) Bronze: Earned 10,000 credits (21,527)Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (14,729,132)PPS Sieve Double Bronze: Earned 100,000,000 credits (132,786,707)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Gold: Earned 500,000 credits (510,317)TRP Sieve (suspended) Gold: Earned 500,000 credits (620,991)AP 26/27 Silver: Earned 100,000 credits (418,876)GFN Amethyst: Earned 1,000,000 credits (1,795,613)PSA Jade: Earned 10,000,000 credits (18,329,123)
Message 19398 - Posted: 28 Nov 2009 | 7:58:34 UTC

Q9450@3,2: 4 Tasks -->around 8000-13000s
Win7 64bit Ultimate with CUDA App running (0.16 CPUs)
____________

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Joined: 30 May 07
Posts: 117
ID: 8810
Credit: 2,897,608,260
RAC: 717,445
321 LLR Gold: Earned 500,000 credits (666,046)Cullen LLR Gold: Earned 500,000 credits (557,609)ESP LLR Ruby: Earned 2,000,000 credits (2,021,061)PPS LLR Ruby: Earned 2,000,000 credits (2,109,953)PSP LLR Gold: Earned 500,000 credits (557,715)SoB LLR Gold: Earned 500,000 credits (554,528)SR5 LLR Ruby: Earned 2,000,000 credits (2,019,335)SGS LLR Ruby: Earned 2,000,000 credits (2,131,335)TPS LLR (retired) Bronze: Earned 10,000 credits (20,001)TRP LLR Ruby: Earned 2,000,000 credits (2,017,688)Woodall LLR Gold: Earned 500,000 credits (559,938)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (4,028,711)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,247,691)Generalized Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (14,004,302)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,339,859,207)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (36,215,460)TRP Sieve (suspended) Double Bronze: Earned 100,000,000 credits (102,264,922)AP 26/27 Jade: Earned 10,000,000 credits (18,750,723)GFN Turquoise: Earned 5,000,000 credits (5,192,662)PSA Double Amethyst: Earned 1,000,000,000 credits (1,343,866,777)
Message 19458 - Posted: 3 Dec 2009 | 17:42:58 UTC - in response to Message 19398.

I ran 4 tasks at the same time on a Q9450 (W7u x64) while doing also cuda crunching
Measured floating point speed 3601.09 million ops/sec
Measured integer speed 10542.65 million ops/sec

Task ID Work unit ID CPU time claimed granted
122264176 83731337 6,840.18 55.70 183.14
122264173 83731334 8,111.21 66.05 183.14
122264095 83731321 7,337.34 59.74 183.14
122263343 83731333 7,043.63 57.35 183.14

The folling are the results for a dual core E8400 (W7u x64) also doing cuda
Measured floating point speed 4042.95 million ops/sec
Measured integer speed 11560.51 million ops/sec

138029586 83723245 4,839.12 43.70 183.14

There is a big difference..... something should be wrong...

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321 LLR Gold: Earned 500,000 credits (666,046)Cullen LLR Gold: Earned 500,000 credits (557,609)ESP LLR Ruby: Earned 2,000,000 credits (2,021,061)PPS LLR Ruby: Earned 2,000,000 credits (2,109,953)PSP LLR Gold: Earned 500,000 credits (557,715)SoB LLR Gold: Earned 500,000 credits (554,528)SR5 LLR Ruby: Earned 2,000,000 credits (2,019,335)SGS LLR Ruby: Earned 2,000,000 credits (2,131,335)TPS LLR (retired) Bronze: Earned 10,000 credits (20,001)TRP LLR Ruby: Earned 2,000,000 credits (2,017,688)Woodall LLR Gold: Earned 500,000 credits (559,938)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (4,028,711)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,247,691)Generalized Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (14,004,302)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,339,859,207)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (36,215,460)TRP Sieve (suspended) Double Bronze: Earned 100,000,000 credits (102,264,922)AP 26/27 Jade: Earned 10,000,000 credits (18,750,723)GFN Turquoise: Earned 5,000,000 credits (5,192,662)PSA Double Amethyst: Earned 1,000,000,000 credits (1,343,866,777)
Message 19491 - Posted: 5 Dec 2009 | 10:48:46 UTC - in response to Message 19458.

Another strange thing:
Computer a) is a dual core T6600 running W7h x64 (4G memory)
Measured floating point speed 2226.92 million ops/sec
Measured integer speed 6732.43 million ops/sec

Computer b) is a dual core 6400 running W7u x64 (2G memory)
Measured floating point speed 2018.86 million ops/sec
Measured integer speed 6335.57 million ops/sec

They should have similar performances and normally they do, but not with GCW sieve:

a) ~8600/8700 seconds/Wu
b) ~9500/13000 (most common 11500) seconds/Wu

any comments?

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321 LLR Gold: Earned 500,000 credits (541,548)Cullen LLR Silver: Earned 100,000 credits (319,902)ESP LLR Gold: Earned 500,000 credits (501,747)PPS LLR Ruby: Earned 2,000,000 credits (2,009,831)PSP LLR Amethyst: Earned 1,000,000 credits (1,303,207)SR5 LLR Silver: Earned 100,000 credits (365,287)SGS LLR Amethyst: Earned 1,000,000 credits (1,255,952)TRP LLR Gold: Earned 500,000 credits (621,647)Woodall LLR Silver: Earned 100,000 credits (118,189)321 Sieve (suspended) Silver: Earned 100,000 credits (102,310)Cullen/Woodall Sieve (suspended) Jade: Earned 10,000,000 credits (14,643,949)Generalized Cullen/Woodall Sieve Ruby: Earned 2,000,000 credits (3,494,619)PPS Sieve Sapphire: Earned 20,000,000 credits (29,857,844)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,208,890)TRP Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,080,539)AP 26/27 Gold: Earned 500,000 credits (507,329)GFN Ruby: Earned 2,000,000 credits (3,460,005)
Message 19521 - Posted: 7 Dec 2009 | 10:05:42 UTC - in response to Message 19491.

Another strange thing:
Computer a) is a dual core T6600 running W7h x64 (4G memory)
Measured floating point speed 2226.92 million ops/sec
Measured integer speed 6732.43 million ops/sec

Computer b) is a dual core 6400 running W7u x64 (2G memory)
Measured floating point speed 2018.86 million ops/sec
Measured integer speed 6335.57 million ops/sec

They should have similar performances and normally they do, but not with GCW sieve:

a) ~8600/8700 seconds/Wu
b) ~9500/13000 (most common 11500) seconds/Wu

any comments?

First of course the 2GB memory difference, but what is the memory bandwith of the 2 machines? 667 MHz? 800MHz? 1066MHz?
____________

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Tour de Primes 2012Tour de Primes 2012Tour de Primes 2015Tour de Primes 2016321 LLR Emerald: Earned 50,000,000 credits (51,155,312)Cullen LLR Sapphire: Earned 20,000,000 credits (36,635,510)ESP LLR Emerald: Earned 50,000,000 credits (51,888,554)Generalized Cullen/Woodall LLR Sapphire: Earned 20,000,000 credits (49,262,367)PPS LLR Double Silver: Earned 200,000,000 credits (251,976,600)PSP LLR Emerald: Earned 50,000,000 credits (74,170,654)SoB LLR Emerald: Earned 50,000,000 credits (51,979,891)SR5 LLR Double Bronze: Earned 100,000,000 credits (105,171,537)SGS LLR Double Bronze: Earned 100,000,000 credits (138,416,067)TPS LLR (retired) Silver: Earned 100,000 credits (235,439)TRP LLR Emerald: Earned 50,000,000 credits (50,499,725)Woodall LLR Sapphire: Earned 20,000,000 credits (37,340,999)321 Sieve (suspended) Turquoise: Earned 5,000,000 credits (8,322,150)Cullen/Woodall Sieve (suspended) Emerald: Earned 50,000,000 credits (83,794,448)Generalized Cullen/Woodall Sieve Double Bronze: Earned 100,000,000 credits (101,107,640)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,630,863,712)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Double Silver: Earned 200,000,000 credits (203,523,358)TRP Sieve (suspended) Double Silver: Earned 200,000,000 credits (201,489,157)AP 26/27 Double Bronze: Earned 100,000,000 credits (100,770,267)GFN Double Gold: Earned 500,000,000 credits (525,185,104)PSA Double Silver: Earned 200,000,000 credits (257,080,048)
Message 19524 - Posted: 7 Dec 2009 | 13:42:02 UTC - in response to Message 19521.

Another strange thing:
Computer a) is a dual core T6600 running W7h x64 (4G memory)
Measured floating point speed 2226.92 million ops/sec
Measured integer speed 6732.43 million ops/sec

Computer b) is a dual core 6400 running W7u x64 (2G memory)
Measured floating point speed 2018.86 million ops/sec
Measured integer speed 6335.57 million ops/sec

They should have similar performances and normally they do, but not with GCW sieve:

a) ~8600/8700 seconds/Wu
b) ~9500/13000 (most common 11500) seconds/Wu

any comments?

First of course the 2GB memory difference, but what is the memory bandwith of the 2 machines? 667 MHz? 800MHz? 1066MHz?


It is not the bandwidth. The faster T6600 is 800MHz, the slower C2D 6400 is 1066MHz. Both have the same size cache as well. About 1/3 of the difference is explained by CPU clockspeed (2.2 vs. 2.13 GHz). The remainder might be related to the different die size (45nm vs. 65nm).


____________
141941*2^4299438-1 is prime!


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321 LLR Gold: Earned 500,000 credits (666,046)Cullen LLR Gold: Earned 500,000 credits (557,609)ESP LLR Ruby: Earned 2,000,000 credits (2,021,061)PPS LLR Ruby: Earned 2,000,000 credits (2,109,953)PSP LLR Gold: Earned 500,000 credits (557,715)SoB LLR Gold: Earned 500,000 credits (554,528)SR5 LLR Ruby: Earned 2,000,000 credits (2,019,335)SGS LLR Ruby: Earned 2,000,000 credits (2,131,335)TPS LLR (retired) Bronze: Earned 10,000 credits (20,001)TRP LLR Ruby: Earned 2,000,000 credits (2,017,688)Woodall LLR Gold: Earned 500,000 credits (559,938)321 Sieve (suspended) Ruby: Earned 2,000,000 credits (4,028,711)Cullen/Woodall Sieve (suspended) Sapphire: Earned 20,000,000 credits (20,247,691)Generalized Cullen/Woodall Sieve Jade: Earned 10,000,000 credits (14,004,302)PPS Sieve Double Amethyst: Earned 1,000,000,000 credits (1,339,859,207)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Sapphire: Earned 20,000,000 credits (36,215,460)TRP Sieve (suspended) Double Bronze: Earned 100,000,000 credits (102,264,922)AP 26/27 Jade: Earned 10,000,000 credits (18,750,723)GFN Turquoise: Earned 5,000,000 credits (5,192,662)PSA Double Amethyst: Earned 1,000,000,000 credits (1,343,866,777)
Message 19601 - Posted: 10 Dec 2009 | 12:15:42 UTC - in response to Message 19524.

Another strange thing:
Computer a) is a dual core T6600 running W7h x64 (4G memory)
Measured floating point speed 2226.92 million ops/sec
Measured integer speed 6732.43 million ops/sec

Computer b) is a dual core 6400 running W7u x64 (2G memory)
Measured floating point speed 2018.86 million ops/sec
Measured integer speed 6335.57 million ops/sec

They should have similar performances and normally they do, but not with GCW sieve:

a) ~8600/8700 seconds/Wu
b) ~9500/13000 (most common 11500) seconds/Wu

any comments?

First of course the 2GB memory difference, but what is the memory bandwith of the 2 machines? 667 MHz? 800MHz? 1066MHz?


It is not the bandwidth. The faster T6600 is 800MHz, the slower C2D 6400 is 1066MHz. Both have the same size cache as well. About 1/3 of the difference is explained by CPU clockspeed (2.2 vs. 2.13 GHz). The remainder might be related to the different die size (45nm vs. 65nm).



Well, this will probably explains the average time difference. One thing I don't understand is the standard deviation. The crunching time for every wu is almost the same for the T6600, but not for the 6400.

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Message 19606 - Posted: 10 Dec 2009 | 15:53:42 UTC - in response to Message 19601.

Well, this will probably explains the average time difference. One thing I don't understand is the standard deviation. The crunching time for every wu is almost the same for the T6600, but not for the 6400.

Possibly your 6400 is running too hot now and then and decreasing the cpu-speed automatically (DUST). Just a thought.
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Message 20635 - Posted: 29 Jan 2010 | 10:59:29 UTC - in response to Message 19606.

Any news on this topic? (slowdown while using all the cores?)

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Message 20716 - Posted: 1 Feb 2010 | 12:23:04 UTC - in response to Message 20635.

I just put an i920 a I860 and a QX9650 on this project just to see the performance and compare the 3

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Message 20798 - Posted: 3 Feb 2010 | 16:43:12 UTC

Core i7 965 3,73GHz, 6GB RAM 1600 cl7, Win7 x64, Boinc 6.10.18, ~10000 s/wu (running 8 wu's)
Core i7 965 3,73GHz, 6GB RAM 1600 cl7, Win7 x64, Boinc 6.10.18, ~5500 s/wu (running 4 wu's)

dunno how long it would take in linux :/
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Message 20801 - Posted: 3 Feb 2010 | 17:37:20 UTC - in response to Message 20798.

Core i7 965 3,73GHz, 6GB RAM 1600 cl7, Win7 x64, Boinc 6.10.18, ~10000 s/wu (running 8 wu's)
Core i7 965 3,73GHz, 6GB RAM 1600 cl7, Win7 x64, Boinc 6.10.18, ~5500 s/wu (running 4 wu's)

dunno how long it would take in linux :/



I take it that's a 4 core CPU with Hyperthreading. The 8 WU result has to be with hyperthreading turned on. What about the 4 WU result? Is that with HT turned off, or was HT still turned on and you had 4 other WUs running on the other 4 cores?

If HT was turned off for the 4 WU test, or if it was turned on but the other four cores were not running WUs, that alone would account for a significant part of the difference in the timings.

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Message 20840 - Posted: 5 Feb 2010 | 20:59:07 UTC - in response to Message 20801.
Last modified: 5 Feb 2010 | 21:00:54 UTC

HT was still turned ON but there was nothing else running, just those 4 WUs.
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Message 20841 - Posted: 5 Feb 2010 | 21:26:32 UTC - in response to Message 20840.
Last modified: 5 Feb 2010 | 21:28:33 UTC

HT was still turned ON but there was nothing else running, just those 4 WUs.



Ok, that explains the huge difference.

Running with the other 4 hyperthreads idle is similar to running with HT turned off because the threads running the PrimeGrid tasks won't be pre-empted by the other hyperthread. That, by itself, can increase the efficiency by about 50%.

In other words, simply because the other hyperthreads are idle, I would have expected the run time to drop from 10,000 seconds down to around 6,700 seconds even if there wasn't a slowdown problem. That's simply the effect of turning HT off. (Or effectively turned off although technically still on, as is the case here.)

So, the effect of the 'slowdown' is approximately 6700 to 5500 seconds, rather than 10000 to 5500 seconds. That's an 18% increase in runtime attributable to the 'slowdown'.

A more accurate test of the slowdown would be to run four WUs from a completely different project at the same time. I'm guessing the runtime, with the other hyperthreads busy, should be around 8000 seconds (with a lot of room for error in that calculation.)

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Message 21541 - Posted: 5 Mar 2010 | 9:52:49 UTC

Xeon W3520 (8 cores w/HT @ 2.66 GHz; 4 GB RAM) ~ 13300 s/WU
Core2Quad Q9550 (4 cores @ 2.83 GHz; 4 GB RAM) ~ 13500 s/WU
Core2Duo E6550 (2 cores @ 2.33 GHz; 4 GB RAM) ~ 8300 s/WU
Core2Duo E6400 (2 cores @ 2.13 GHz; 2 GB RAM) ~ 8900 s/WU
Core2Duo T8300 (2 cores @ 2.40 GHz; 4 GB RAM) ~ 8250 s/WU

All clients with RHEL 5.4 x86_64

The C2Q is odd.

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