20211014, 12:10  #1 
"Juan Tutors"
Mar 2004
569_{10} Posts 
Should I abandon this test?
I am doing a PRP test on a 10^8 digit Mersenne for which I am only at 3.79% of the way done. It has already had 2 Gerbicz/double check errors. It won't finish until maybe September 2022. Should I just abandon it/unreserved it and start a new test? FYI I have already stopped the test to do a DC assignment that passed.
Last fiddled with by JuanTutors on 20211014 at 12:11 
20211014, 18:02  #2  
"Viliam Furík"
Jul 2018
Martin, Slovakia
773 Posts 
Quote:


20211014, 18:08  #3 
"Oliver"
Sep 2017
Porta Westfalica, DE
1088_{10} Posts 
You should also pay attention on the errors: Doing DC instead or LL likely will soon cause a bad result! You could do "normal" PRP with proofs or even LLDC by doing a PRP with proof; there is also PRPCF which has proofs.

20211014, 18:35  #4 
"Juan Tutors"
Mar 2004
569 Posts 

20211021, 12:30  #5 
"Juan Tutors"
Mar 2004
569 Posts 
Update to this post: I did decide to switch exponents since I was so early into the test. The thing is, with my new exponent, I am only 2.15% of the way through the newest test and I am already at 3 Gerbicz errors in. Should I quit this machine? Should I use it to just constantly P1 on my current assignments? Should I keep going with this PRP test?

20211021, 12:45  #6 
"Oliver"
Sep 2017
Porta Westfalica, DE
2^{6}·17 Posts 
If your machine is that problematic, PRPCF is an option, since its assignments are so short that they should come through nicely.
P1 is risky if the machine is unstable, factors are likely missed. If a normal P1 would turn up with a factor, a single problem in the computation would prevent that factor from coming up. With you machine it is thus likely that it might never find a factor. Needless to say, you should try to investigate why the errors occur. Unstable memory? Over/underclock? Maybe try the stress test; are small FFTs stable? Are big FFTs stable? Last fiddled with by kruoli on 20211021 at 12:45 Reason: Punctation. 
20211021, 12:50  #7  
Sep 2002
Database er0rr
2^{2}·1,063 Posts 
Quote:


20211022, 17:13  #8  
"Juan Tutors"
Mar 2004
569 Posts 
Quote:
Average temp hovering between 78C and 80C. Intel Core i5 6500 (Skylake) 3.20 GHz processor (though core temp says 3292.74MHz). TDP 65.0 Watts. Power around 40.0 Watts. 

20211022, 17:36  #9  
Sep 2002
Database er0rr
2^{2}·1,063 Posts 
Quote:
I have run Intel chips at these temperatures, but if heat builds in the case it might overheat other components such as RAM or bridge chips. Last fiddled with by paulunderwood on 20211022 at 17:37 

20211022, 18:01  #10  
"Juan Tutors"
Mar 2004
569 Posts 
Quote:
Also an update, I just tried switching BACK to the number that I had stopped working on just last week and there was an error reading ALL the intermediate files. I don't even have a viable explanation for that. 

20211022, 18:06  #11  
Sep 2002
Database er0rr
2^{2}·1,063 Posts 
Quote:


Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
I found the primality test, there seems to be no composite numbers that pass the test  sweety439  sweety439  7  20200211 19:49 
Modifying the Lucas Lehmer Primality Test into a fast test of nothing  Trilo  Miscellaneous Math  25  20180311 23:20 
Double check LL test faster than first run test  lidocorc  Software  3  20081203 15:12 
Will the torture test, test ALL available memory?  swinster  Software  2  20071201 17:54 
A primality test for Fermat numbers faster than Pépin's test ?  T.Rex  Math  0  20041026 21:37 