20220726, 14:03  #639  
P90 years forever!
Aug 2002
Yeehaw, FL
17531_{8} Posts 
Quote:
Quote:


20220726, 14:23  #640  
"James Heinrich"
May 2004
exNorthern Ontario
2^{3}·479 Posts 
Quote:
I don't think disabling CERT work just because PauseWhileRunning exists in the config is necessarily a good idea  the program(s) listed there might cause interruption very rarely. Isn't there some kind of running performance average that Prime95 records recent performance vs expected performance that might serve as a better indication of reliable availability? 

20220726, 14:26  #641 
"James Heinrich"
May 2004
exNorthern Ontario
2^{3}×479 Posts 
This is listed as the preferred download version on https://www.mersenne.org/download/ but the homepage https://www.mersenne.org/ still shows "Prime95 version 30.7 released" as the top entry.

20220726, 15:13  #642 
Apr 2003
Milan, Italy
2^{2}·3^{2} Posts 
That's it, then. I have PauseWhileRunning active to stop running whenever I have compilation jobs or a VM running.

20220726, 15:14  #643 
Apr 2003
Milan, Italy
2^{2}·3^{2} Posts 

20220726, 15:32  #644 
P90 years forever!
Aug 2002
Yeehaw, FL
3×5^{2}×107 Posts 

20220730, 04:14  #645 
Jul 2022
2 Posts 
Whenever I try this:
https://i.imgur.com/HJvs036.png This happens: https://i.imgur.com/KBUg0CS.png Happened the same with latest 30.8, both fresh download. Why cant I use fixed 122k FTT in place ? Should I use other values for vcore undervolt testing ? 
20220730, 18:20  #646 
"Serge"
Mar 2008
Phi(4,2^7658614+1)/2
2^{4}×3^{3}×23 Posts 
Because such FFT doesn't exist.
FFT are implemented for a certain list of sizes. In vicinity of "122" there are: 120, 128, 144 and so on. Longer answer: "still why not 122?" Because FFT is an algorithm that relies on nested iterations of size that is a small number: 2, 3, 5, 7 (at this time), and no more than two of the 3s, 5s, or 7s. A large number of multiples 2s is admissible. 122 = 2 * 61, and 61 makes it impossible until someone (for example you!) writes the code to implement a pass of exactly 61. 
20220730, 18:49  #647 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
2^{5}·3·71 Posts 
And to add to what Batalov already posted, leastsmooth (having larger largest prime factor) fft length tend to be less efficient, while power of 2 fft lengths are often very efficient relative to the near neighbors.
See for mprime/prime95, last attachment of https://www.mersenneforum.org/showpo...19&postcount=5 (right column, higher is better); for Mlucas https://www.mersenneforum.org/showpo...5&postcount=12 attachment, right colum, smaller is better; for gpuowl, http://www.mersenneforum.org/showpost.php?p=488535&postcount=2 last attachment; or for cllucas https://www.mersenneforum.org/showpo...71&postcount=2 last attachment (which shows power of 2 fft lengths 4 Mi and higher distinctly faster per k of fft length than other smoothness values. Lists of 7smooth fft lengths here. Last fiddled with by kriesel on 20220730 at 19:31 
20220803, 11:37  #648 
Jul 2022
1 Posts 
Prime95 app auto close during running and show 240K FFT size failure
Prime95 app auto close during running and show 240K FFT size failure. can someone help advise the possible failure reason?
FATAL ERROR: Rounding was 0.49999143, expected less than 0.4 Hardware failure detected running 240K FFT size, consult stress.txt file. FATAL ERROR: Rounding was 0.5, expected less than 0.4 Hardware failure detected running 240K FFT size, consult stress.txt file. Info: Intel Fishhawk Fall platform. Prime95 (v30.8b15) 
20220803, 19:09  #649  
P90 years forever!
Aug 2002
Yeehaw, FL
3×5^{2}×107 Posts 
Quote:
You can try stress testing fewer cores, less memory, or disabling AVX512 / FMA / etc. to perhaps narrow down the problem. I'm not familiar with "Fishhawk Fall". If this is a notyetreleased product, you can email me at woltman@alum.mit.edu to discuss if new CPU features could possibly be an issue. Yes, I understand you may be very limited in what you can discuss. 

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