20221114, 16:32  #23 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
3^{3}·263 Posts 
So, no 100Mdigit exponents or thereabouts found with all LL tests by CUDALucas, for which 20000K would be a reasonable FFT size selection, and so make them suspect.
https://www.mersenne.org/report_ll/?...r_id=laurv&B1= shows lots of selfchecking, probably gpuowl/CUDALucas pairs since they're nonzero and zero shift pairs, and an occasional differentuser check in the verified exponents. A gpuowl v6.11380 result for M34643591 matched the previous two runs (the first is the outlier) https://www.mersenne.org/report_expo...4643591&full=1 Last fiddled with by kriesel on 20221114 at 17:03 
20221114, 23:53  #24 
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
7101_{10} Posts 
recheck thread
I've created a thread in my blog to track rechecks for the 74 flagged by George's query as CUDALucasonly verification, at https://mersenneforum.org/showthread.php?t=28237. Feel free to post claims & completions there, and I'll update post one of that thread as work progresses.
(I think a recheck of LaurV's monster will be a long time coming, but the rest look tractable.) 
20221115, 01:00  #25 
Jul 2003
So Cal
2×7×181 Posts 
Just as a comment, those than I (Greg) did were run on nVidia Tesla hardware with ECC enabled both on the system and GPU memory. Doesn't make them errorproof but I would be very surprised if there's an error with matching residues with different shifts.

20221115, 03:34  #26  
Romulan Interpreter
"name field"
Jun 2011
Thailand
2×47×109 Posts 
Quote:
Please ignore, I went to the thread, I see people already jumping into it, so I will reserve there, to avoid stepping on toes. On the other hand, here is the link for the files with the residues as discussed in the former post. You should NOT waste time on it, unless your name is George, hihi, but if you have itching on the fingers, you can download and see if you can reconstruct the bug in your card (need nVidia card and cudaLucas). I don't think is carddependent, but I would be curious if older cufft/cudart libraries or versions of cudaLucas show this behavior. Anyhow, this is minor importance, I don't think it will help, except satisfying my personal curiosity. About the zip: there are 4 files. The last two (with the larger iteration number) are not useful, except to confirm that you get the same residue after 10 iterations. The first two are the same file, except the FFT size inside is set to 19600k and 20M respectively (you can binary compare them to see what is changed), because the test is so fast that you don't have time to press the "f/F" to change the FFT. But you can change the FFT if you want. You have to rename the starting file (loweriteration count) to c332329111 into your cudaLucas folder and run a test for this expo. The test takes less than a minute. You have to do this only for the 20M FFT, the other is provided as witness only. To see anything on screen you may change the output every 1 iteration, and checkpoint every 10. Last fiddled with by LaurV on 20221118 at 04:24 

20221115, 17:34  #27  
"TF79LL86GIMPS96gpu17"
Mar 2017
US midwest
15675_{8} Posts 
Quote:
Last fiddled with by kriesel on 20221115 at 17:35 

20221204, 19:04  #28 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
10101000100110_{2} Posts 

20221204, 19:26  #29 
Aug 2002
North San Diego County
2^{3}×97 Posts 

20221205, 16:17  #30 
Jul 2004
Milan, Ita
229 Posts 
Requesting another TC (again, LL only, please) for this one:
Code:
DoubleCheck=64714673,75,1 
20221205, 16:40  #31 
Aug 2002
North San Diego County
2^{3}·97 Posts 
Running. ETA 33 hours.
Last fiddled with by sdbardwick on 20221205 at 16:41 Reason: updated ETA 
20221205, 18:04  #32 
6809 > 6502
"""""""""""""""""""
Aug 2003
101×103 Posts
2×5×13×83 Posts 
Two more wild exponents have shown up. One is yet another suspect from anon.

20221205, 19:33  #33 
Aug 2002
North San Diego County
1100001000_{2} Posts 
Took all 3 remaining exponents. Should be done in about 5 days; 2 queued on slower nonFMA Xeon.
Last fiddled with by sdbardwick on 20221205 at 19:43 Reason: Updated ETA 
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