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strange super pi 1.5 (and 1.4) behavior.

post #1 of 5
Thread Starter 
I7 950, RampageII Extreme running modest overclock @3.8 ghz. Dual boot system, XP 32 bit and vista 64 bit.
1m time ~10.23 sec, 1 ht off, super pi used 1 thread@ 50%

Out of nowhere, super pi is now using 4 threads, and 1m time is up to 10.7 sec.
Same behavior in XP and vista.

Any ideas???

Haven't changed anything, 1504 bios.

Tried clear cmos and use default values, no change.
    
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WD 150g raptor, WD 750 AAKS x1 plus three others XP Home Sp2/Vista64 Prem/Windows 7β Samsung Syncmaster 244T Logitech G15 
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post #2 of 5
Set SuperPi's affinity to only one core.
 
Wild eyes (2015)
(10 items)
 
 
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AMD Ryzen 7 1700 3.8GHz at 1.232v ASRock Fatal1ty X370 Gaming-ITX/ac MSI GTX 1080Ti FE 2000MHz at 0.95v G.SKILL TridentZ 2x8GB 3466MHz 
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Samsung 950 PRO M.2 256GB SSD EK Supremacy EVO Windows 10 Home Retail Acer XB270HU 
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i7 5960X 4.6GHz at 1.2V  Asus X99 Deluxe Evga 980 Ti SC+ Corsair Dominator Platinum 16GB at 2666 MHz 16-... 
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Wild eyes (2015)
(10 items)
 
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 3.8GHz at 1.232v ASRock Fatal1ty X370 Gaming-ITX/ac MSI GTX 1080Ti FE 2000MHz at 0.95v G.SKILL TridentZ 2x8GB 3466MHz 
Hard DriveCoolingOSMonitor
Samsung 950 PRO M.2 256GB SSD EK Supremacy EVO Windows 10 Home Retail Acer XB270HU 
PowerCase
Corsair SF600 NCase M1 
CPUMotherboardGraphicsRAM
i7 5960X 4.6GHz at 1.2V  Asus X99 Deluxe Evga 980 Ti SC+ Corsair Dominator Platinum 16GB at 2666 MHz 16-... 
Hard DriveCoolingOSMonitor
Samsung 950 Pro 256GB EK Supremacy EVO, EK Titan X Full Cover, EK X99... Windows 10 Home retail Acer Predator XB270HU 
PowerCase
Seasonic SS-760XP2 Corsair Air 540 White 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Samsung 850 Pro 256GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium BenQ XL2720Z 
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post #3 of 5
Thread Starter 
Quote:
Originally Posted by MrLinky;13920932 
Set SuperPi's affinity to only one core.

I've tried that with each core, and it works and only one core is used. In fact I can run it on any cor I want. But before I didn't have to do this. Super pi is supposed to and did default to one core. Also, for 3.8 ghz, my 1m time has gone from ~10.25 sec to ~10.7 sec.

Anyone else any other thoughts??
    
CPUMotherboardGraphicsRAM
i7 950 4.0ghz @1.18v Asus Rampage II Extreme 1504 bios 2X EVGA GTX 295 Corsair Dominator DHX 3x2gb 1600Mhz 
Hard DriveOSMonitorKeyboard
WD 150g raptor, WD 750 AAKS x1 plus three others XP Home Sp2/Vista64 Prem/Windows 7β Samsung Syncmaster 244T Logitech G15 
PowerCaseMouseMouse Pad
Silverstone Olympia 1 kW Thermaltake Armour Razer Lachesis Razer Mantis gaming surface 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 950 4.0ghz @1.18v Asus Rampage II Extreme 1504 bios 2X EVGA GTX 295 Corsair Dominator DHX 3x2gb 1600Mhz 
Hard DriveOSMonitorKeyboard
WD 150g raptor, WD 750 AAKS x1 plus three others XP Home Sp2/Vista64 Prem/Windows 7β Samsung Syncmaster 244T Logitech G15 
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post #4 of 5
Quote:
Originally Posted by nuclearjock;13921547 
I've tried that with each core, and it works and only one core is used. In fact I can run it on any cor I want. But before I didn't have to do this. Super pi is supposed to and did default to one core. Also, for 3.8 ghz, my 1m time has gone from ~10.25 sec to ~10.7 sec.

Anyone else any other thoughts??

Start msconfig. Go to 'boot tab' then 'advanced options tab'. Then uncheck the 'number of processors' option if it is checked. It should not be. Then restart windows ..
    
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post #5 of 5
Quote:
Originally Posted by nuclearjock;13921547 
I've tried that with each core, and it works and only one core is used. In fact I can run it on any cor I want. But before I didn't have to do this. Super pi is supposed to and did default to one core. Also, for 3.8 ghz, my 1m time has gone from ~10.25 sec to ~10.7 sec.

Anyone else any other thoughts??

SuperPi only uses one thread, so if its affinity isn't defined, Windows will attempt to distribute the load. The problem is it can't actually have more than one thread processing it at any given time, so Windows just passes the work from thread to thread extremely quickly. Software can't poll fast enough, so it looks like thread 1 is at 20%, thread 2 is at 5%, thread 3 is at 50%, and thread 4 is at 25% (for example).

SuperPi, like any software, won't perform exactly the same every time. I just ran 1m on my daily OS four times in a row, and I got 10.97, 10.24, 10.29, and 10.25. Unless you were always seeing 10.25 and now are always getting 10.7, 0.4 seconds difference isn't abnormal.

It's nice to have an nLite'd XP or RT7Lite'd 7 as a dedicated benching OS that uses less resources and gives more consistent scores.
 
Wild eyes (2015)
(10 items)
 
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 3.8GHz at 1.232v ASRock Fatal1ty X370 Gaming-ITX/ac MSI GTX 1080Ti FE 2000MHz at 0.95v G.SKILL TridentZ 2x8GB 3466MHz 
Hard DriveCoolingOSMonitor
Samsung 950 PRO M.2 256GB SSD EK Supremacy EVO Windows 10 Home Retail Acer XB270HU 
PowerCase
Corsair SF600 NCase M1 
CPUMotherboardGraphicsRAM
i7 5960X 4.6GHz at 1.2V  Asus X99 Deluxe Evga 980 Ti SC+ Corsair Dominator Platinum 16GB at 2666 MHz 16-... 
Hard DriveCoolingOSMonitor
Samsung 950 Pro 256GB EK Supremacy EVO, EK Titan X Full Cover, EK X99... Windows 10 Home retail Acer Predator XB270HU 
PowerCase
Seasonic SS-760XP2 Corsair Air 540 White 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Samsung 850 Pro 256GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium BenQ XL2720Z 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
  hide details  
Reply
 
Wild eyes (2015)
(10 items)
 
 
CPUMotherboardGraphicsRAM
AMD Ryzen 7 1700 3.8GHz at 1.232v ASRock Fatal1ty X370 Gaming-ITX/ac MSI GTX 1080Ti FE 2000MHz at 0.95v G.SKILL TridentZ 2x8GB 3466MHz 
Hard DriveCoolingOSMonitor
Samsung 950 PRO M.2 256GB SSD EK Supremacy EVO Windows 10 Home Retail Acer XB270HU 
PowerCase
Corsair SF600 NCase M1 
CPUMotherboardGraphicsRAM
i7 5960X 4.6GHz at 1.2V  Asus X99 Deluxe Evga 980 Ti SC+ Corsair Dominator Platinum 16GB at 2666 MHz 16-... 
Hard DriveCoolingOSMonitor
Samsung 950 Pro 256GB EK Supremacy EVO, EK Titan X Full Cover, EK X99... Windows 10 Home retail Acer Predator XB270HU 
PowerCase
Seasonic SS-760XP2 Corsair Air 540 White 
CPUMotherboardGraphicsRAM
AMD FX-8350 5GHz at 1.524v ASUS Crosshair V Formula-Z Sapphire R9 290X with EK water block 2x4GB G.Skill Trident X 2500MHz 9-11-11 1.68v  
Hard DriveCoolingOSMonitor
Samsung 850 Pro 256GB + 2x Seagate 3TB HDDs Koolance CPU-380A water block Windows 7 64-bit Home Premium BenQ XL2720Z 
PowerCase
Seasonic X 650 Gold Lian Li PC-T60B test bench 
  hide details  
Reply
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