20211029, 18:51  #1 
"Juan Tutors"
Mar 2004
569 Posts 
Bug in iteration count in Prime95?
I am doing a PRP test on M332290099 (again after restarting after I gave up on it after a ton of Gerbicz errors and then went back to it but the save files were bad so the test restarted).
I noticed that it said "Iteration: 6645800/332290098" (SEE ATTACHED IMAGE.) I thought "weird, I never noticed in all this time that second number is 1 less than the exponent". But then I went home and checked on one of my home computers and the second number is definitely the exponent and not 1 less than the exponent. Did I run into a bug? Last fiddled with by JuanTutors on 20211029 at 18:56 
20211029, 20:23  #2 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
2^{3}·7^{2}·17 Posts 
No.
LL does p2 iterations. https://en.wikipedia.org/wiki/Lucas%...primality_test PRP does p1 iterations. https://en.wikipedia.org/wiki/Fermat_primality_test Last fiddled with by kriesel on 20211029 at 20:23 
20211029, 22:53  #3  
"Juan Tutors"
Mar 2004
569 Posts 
Quote:
"Iteration: 203663120/332292529" "Iteration: 168611800/332316293" I see the same thing on my desktop. The number of iterations it states is the exponent. Last fiddled with by JuanTutors on 20211029 at 22:54 

20211030, 04:27  #4 
Romulan Interpreter
"name field"
Jun 2011
Thailand
17·19·31 Posts 
Probably (accidentally or intentionally) you selected from the menus "windows/show all workers in the same window". Scratch that. I misunderstood your question. Going for the morning coffee... Are you running same version of p95, and same test type? Last fiddled with by LaurV on 20211030 at 04:31 
20211030, 06:29  #5  
P90 years forever!
Aug 2002
Yeehaw, FL
17420_{8} Posts 
Quote:


20211030, 15:10  #6 
"Juan Tutors"
Mar 2004
569 Posts 
All running PRP. At home, I confirmed that my laptop running 2 instances that I took a picture of above is running 30.3 b6. I also confirmed that my desktop upstairs (not pictured) is running 30.5 b2 for some reason. The one at work that as one less iteration that I showed above is running 30.3 b6 according to mersenne.org, which I assume is accurate. I never checked a 4th computer.
I checked to see if I am running LL tests accidentally, but these are all PRP tests. I am sure you can check my username through mersenne.org to confirm. 
20211030, 17:32  #7 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{4}·7·71 Posts 
Looking at the code (which has not changed among all the versions you are using), the only way I see for the iteration counter to be one less than the exponent is to set
PRPStraightForward=1 in prime.txt. This disables Gerbicz error checking and proofs. 
20211030, 19:13  #8 
"Juan Tutors"
Mar 2004
569 Posts 
I will look to see if that is set when I get to that computer on Monday. However, I did not set that option manually. I didn't know that option existed, and the computer in question is the one that has been having problems, so I would not have set it up to avoid Gerbicz error checking.

20211030, 19:53  #9 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{4}×7×71 Posts 
You may need to send me prime.txt, local.txt, worktodo.txt, and a savefile.

20211030, 20:08  #10 
"Juan Tutors"
Mar 2004
239_{16} Posts 

20211030, 21:28  #11 
P90 years forever!
Aug 2002
Yeehaw, FL
2^{4}×7×71 Posts 

Thread Tools  
Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Maximum core count support in latest Prime95  avinashkv94  Information & Answers  3  20210909 15:26 
Looks like it's down for the count  bcp19  Hardware  12  20130426 13:52 
Prime count up  henryzz  Lounge  7  20070919 19:45 
Count of Matrices  davar55  Puzzles  2  20070613 20:46 
Can't figure out how to count in DOS.  jasong  Software  2  20060722 21:49 