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Message boards : General discussion : Windows 10 – System and compressed memory (SACM) – High CPU load

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Yair GivoniProject donor
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Discovered 1 mega prime321 LLR Silver: Earned 100,000 credits (104,357)Cullen LLR Bronze: Earned 10,000 credits (83,851)Generalized Cullen/Woodall LLR Bronze: Earned 10,000 credits (13,147)PPS LLR Turquoise: Earned 5,000,000 credits (5,808,333)PSP LLR Ruby: Earned 2,000,000 credits (4,567,664)SoB LLR Sapphire: Earned 20,000,000 credits (32,963,221)SR5 LLR Bronze: Earned 10,000 credits (21,624)SGS LLR Amethyst: Earned 1,000,000 credits (1,596,638)TRP LLR Amethyst: Earned 1,000,000 credits (1,202,505)Woodall LLR Ruby: Earned 2,000,000 credits (3,812,974)Generalized Cullen/Woodall Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,247,364)PPS Sieve Turquoise: Earned 5,000,000 credits (6,469,018)Sierpinski (ESP/PSP/SoB) Sieve (suspended) Amethyst: Earned 1,000,000 credits (1,421,388)TRP Sieve (suspended) Silver: Earned 100,000 credits (150,475)AP 26/27 Double Bronze: Earned 100,000,000 credits (139,245,317)GFN Double Silver: Earned 200,000,000 credits (213,730,663)
Message 95175 - Posted: 21 May 2016 | 13:30:36 UTC

Lately I noticed that the SACM is using about 5% of the CPU (I5-6600) which is high, I read about it online but no practical explanation or solution was offered.

The machine runs BOINC 24/7 and since I last joined Primegrid the GPU (GTX 960) is used as well.

The machine have 8GB of RAM and the GPU 4GB, I never saw the RAM used more than 3.5GB and the GPU RAM is used less than 500MB,so there is no memory pressure and there is no need to compress anything

I tested several suggestions I found online which didn’t help and finally I thought about something else which in my case did.

When I started to run the low GFNs (15-17) the GPU was not fully loaded (~80%) so I allowed two WUs to run concurrently thinking that the combined elapse time will be shorter, it did but the SACM rose. I changed the app_config back to allow only one WU to run at a time and reread it during the run, the SACM went down immediately, I tried it several times and the results were the same. So now I run only one GPU WU.

My conclusion is that when the GPU is fully loaded there is high data traffic between the main RAM and the GPU RAM that somehow triggers the SACM to work hard even when there is no need for it.

Your take on the subject will be appreciated.

Profile Michael GoetzProject donor
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The "Shut up already!" badge:  This loud mouth has mansplained on the forums over 10 thousand times!  Sheesh!!!Discovered the World's First GFN-19 prime!!!Discovered 2 mega primesFound 1 prime in the 2018 Tour de PrimesFound 1 prime in the 2019 Tour de PrimesFound 1 prime in the 2020 Tour de PrimesFound 2 primes in the 2021 Tour de PrimesFound 2 primes in the 2022 Tour de PrimesFound 1 mega prime in the 2022 Tour de PrimesFound 1 prime in the 2022 Tour de Primes Mountain Stage321 LLR Turquoise: Earned 5,000,000 credits (6,638,389)Cullen LLR Turquoise: Earned 5,000,000 credits (5,038,114)ESP LLR Turquoise: Earned 5,000,000 credits (6,177,890)Generalized Cullen/Woodall LLR Turquoise: Earned 5,000,000 credits (5,094,541)PPS LLR Sapphire: Earned 20,000,000 credits (23,642,050)PSP LLR Turquoise: Earned 5,000,000 credits (7,956,186)SoB LLR Sapphire: Earned 20,000,000 credits (36,067,618)SR5 LLR Jade: Earned 10,000,000 credits (12,645,567)SGS LLR Turquoise: Earned 5,000,000 credits (5,037,630)TRP LLR Turquoise: Earned 5,000,000 credits (5,084,329)Woodall LLR Turquoise: Earned 5,000,000 credits (5,032,821)321 Sieve (suspended) Jade: Earned 10,000,000 credits (10,061,196)Cullen/Woodall Sieve (suspended) Ruby: Earned 2,000,000 credits (4,170,256)Generalized Cullen/Woodall Sieve (suspended) Turquoise: Earned 5,000,000 credits (5,059,304)PPS Sieve Sapphire: Earned 20,000,000 credits (22,885,121)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 Jade: Earned 10,000,000 credits (10,902,645)GFN Emerald: Earned 50,000,000 credits (92,455,703)WW Emerald: Earned 50,000,000 credits (65,888,000)PSA Jade: Earned 10,000,000 credits (12,445,029)
Message 95177 - Posted: 21 May 2016 | 14:23:27 UTC - in response to Message 95175.

My conclusion is that when the GPU is fully loaded there is high data traffic between the main RAM and the GPU RAM that somehow triggers the SACM to work hard even when there is no need for it.

Your take on the subject will be appreciated.


Or it has to do with the GPU having to switch back and forth between two programs.

Try running a larger GFN, which should load the GPU much higher (99% is typical). If a single large GFN task causes SACM problems, then you're correct. If it doesn't, then it's something else.
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Message boards : General discussion : Windows 10 – System and compressed memory (SACM) – High CPU load

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