Bad sieve files found for 2020 and 2021

[gd_barnes]

Originally Posted by pepi37

Yes , under Linux srsieve2 is multi-threaded, Windows version never support MT ( it was left on TODO list)
But in any case one instance per core give bet output as VBCurtsi say

He was referring to sr2sieve, not srsieve2. I wasn't aware that sr2sieve was multi-threaded in Linux.

Srsieve2 is multi-threaded in both Windows and Linux. I sometimes run multi-threads on srsieve2 in Windows.

[gd_barnes]

I have now sent files to Yoyo for re-sieving for our reserved and recommended bases per #1 and #2 under prioritizing the sieves in the announcement post. I've also clarified those in that post. The bases sent were:

R111, R534, R667, S529, & S536

[gd_barnes]

The 5 sieve files from the last post have now been fully re-sieved by Yoyo. All bases with recommendations or reservations now have good sieve files. I have run additional tests as needed below the current test limit or below where the reservations began. No additional primes were found. Updated files have been posted on the pages and people with reservations (who I could get a hold of) have received additional tests to run.

I have finished analyzing all of the applicable sieve files as specified in this thread. Out of 202 files sieved to 5e14 in 2020, 2021, and early 2022, 109 (54%) were identified as potentially bad. Out of the 109, 104 are very obviously bad. The other 5 may have an incorrect sieve depth or other unusual error such as some factors that may not have been removed or some unusual algebraic factors that I have yet to identify.

All 104 files that are clearly bad occurred between Aug. 2020 and Sept. 2021. They were definitely impacted by the scripting error. The other 5 occurred a little outside of this time-frame and it is not so clear what is going on with them. They do deviate from the number of tests that they should have so we will see what happens when Yoyo re-sieves them.

All of the above 109 files have been re-sieved to 1e12 and will be sent to Yoyo to sieve to 5e14 (or 1e15 in some cases) a few at a time to avoid overwhelming them. The next set of 6 files have been sent. They are the bad files from SRBase's 2k recommended effort from 2022. Most of the bases with 2-3 k's remaining with bad files will only have a few hundred additional tests that need to be run so are very unlikely to yield a prime. The more k's remaining, generally the bigger the problem.

All potentially bad files have been removed from the reservations pages with applicable notes about what is going on with them.