Posts by Tomáš Brada

21) Message boards : Closed Issues : Upload not working! [error] Error reported by file upload server: file_upload_handler: db error Deprecated: Creation of dynamic property BoincUser::$prefs is deprecated in /var/boincadm/prj/html/inc/forum_db.inc on line 164 (Message 4643) Posted 6 Jul 2021 by Tomáš Brada Post: Message if it does not come. It should update twice a day.
22) Message boards : Closed Issues : LOTS of Validation Pendings (Message 4641) Posted 6 Jul 2021 by Tomáš Brada Post: There were some changes in how the data is stored, and just now I released updated version. See #4638 I also have a question Database Error # Copyright Tomas Brada, ask on forum about reuse or citation. # where k = 18 Fatal error: Uncaught Error: Call to a member function fetch_object() on null in /var/boincadm/prj/html/user/spt_list.php:64 Link https://boinc.tbrada.eu/spt_list.php?k=18 Maybe people calculate in vain? Why are the results not visible? This needs to be checked.
23) Message boards : Closed Issues : LOTS of Validation Pendings (Message 4640) Posted 6 Jul 2021 by Tomáš Brada Post: Now that the server is back on on-line until it disappears again we can see that ... According to the Server Status Page it's not getting better! Yes, I admit. The power cable was plugged into my tower PC instead in the power adapter. Of course it shut with the pc down, but remained on in sleep :think:. The validator is catching up now, it should be in the low double digits.
24) Message boards : Closed Issues : Upload not working! [error] Error reported by file upload server: file_upload_handler: db error (Message 4639) Posted 6 Jul 2021 by Tomáš Brada Post: The FUH should work now and validation is running too
25) Message boards : Code and Servers : Symmetric Prime Tuples development (Message 4638) Posted 6 Jul 2021 by Tomáš Brada Post: I enabled the prime tuple database again! at https://boinc.tbrada.eu/spt/explore.php You can also download all tuples of certain kind into a text file, limited to 200000 at a time. The instructions are there, but here is a example: https://boinc.tbrada.eu/spt/tuples.php?spt=20&p=1 gives first page of SPT(20), or to get html of the second page https://boinc.tbrada.eu/spt/tuples.php?spt=20&p=2&ln.
26) Message boards : News : ETA to resume the project (Message 4623) Posted 26 Jun 2021 by Tomáš Brada Post: Tomáš Brada Required to canonize 10 cyclic pandiagonal DLS of order 25 Can you run this task on a project? I am afraid, I can't do order 25. If I remember correctly, order 17 worked barely, and 25 is so much harder. On the other hand, today's test was successful, do not mind the disabled transitioner. Edit: thank you for the message, Natalia :)
27) Message boards : News : ETA to resume the project (Message 4620) Posted 25 Jun 2021 by Tomáš Brada Post: Updated: All of the services that should be, are mostly running. I spent extra effort to set up automation of update tasks and more lubricated development environment. Tomorrow we could try sending few first tasks and then resume prime tuples sub-project. A big motivation loss was that OEIS does not accept any more sequences to prime tuples, however, I did not realize, extensions to existing sequences are still accepted.
28) Message boards : News : ETA to resume the project (Message 4619) Posted 15 Jun 2021 by Tomáš Brada Post: Updates: I finished the semester exams, with actually my personal records in grades. The new mini computer arrived already and I loaded it with a version of Manjaro (mainline 5.12.1). It is awesome that it supports NVMe (250GB), runs hot to the touch but only up to 60C. So now I have three mini's and a tower. The the Sinvoip abomination will be retired but the original Pi B+ will probably continue running and be used for remote control, backup and testing. I am debating whether to reinstall a debian-based os, because idk how manjaro behaves, but Archlinux users are expected to read mailing list and update like weekly, and if you dont, updates may break. Hopefully manjaro is diffrent. The forums are for a while now hosted on a web hosting provider, which had a great discount. I'd like to keep it that way, but the boinc scheduler can't run there, and it needs access to the same database tables as boinc user pages use, so... But there is also a medical sort of web app for a client that really should not be hosted in cloud, so getting that off locally is a priority and might as well move the forums to keep it simple. You guessed it, but I am going to push the re-launch ten days later. Because it's just not realistic. Maybe sooner idk. On the other hand I have been designing and a bit coding an BOINC-related project that I am super excited about announcing on this forum soon.
29) Message boards : Cafe : 2021 BOINC Workshop (Message 4617) Posted 30 May 2021 by Tomáš Brada Post: Thank you Contact for providing us with the even coverage!
30) Message boards : News : ETA to resume the project (Message 4610) Posted 30 Apr 2021 by Tomáš Brada Post: I promise the project will resume sending spt work at end of June 2021. Happy Spring! Today is the birthday of Jaroslav Hašek [\|Hashek\|].
31) Message boards : Number crunching : Sudden credit loss, 2021-04-02 (Message 4603) Posted 3 Apr 2021 by Tomáš Brada Post: I already have a more powerful replacement ordered, just it is stuck in customs for a month already.
32) Message boards : Number crunching : Sudden credit loss, 2021-04-02 (Message 4601) Posted 3 Apr 2021 by Tomáš Brada Post: This appears to be oversight on my end... Let me explain what is going on. For a long time, the database was always being corrupted after a long write-intensive task (reorganizing, post-processing, etc) for unknown reasons. I always restored from daily backup and forgot about it (and the task that caused it). But this time, i decided to actually fix it. Obvious solution: the disk could be failing - replaced it and hit the db with test workload. It still corrupted. Hmm what if the sata host controller is corrupting data? (some of the same model did) But at this point, the uptime of was suffering too much (there are other services running besides boinc), so I moved to spare, weaker, computer (parlon). But I forgot about boinc forums and stats. Doh! Well the sata controller was not the cause, it still corrupted after connecting the disk via USB to the now-offline computer (saran) and running the test workload. Now it is running memtest, because it could be caused by DDR3 bit flip.
33) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4387) Posted 2 Feb 2021 by Tomáš Brada Post: Thanks, but I didn't understand much. Is it possible to find all ODLS in this way? Let me write examples... (do not forget space between number 1 and > ) ortogonbw Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8 1 >output.txt init_trans(12) used 495 nodes num_dtrans: 15928 init_disjoint(12) used 145 heads and 191281 nodes L(0) c(2) 1 / 198 L(1) c(7) X / 93 This calculates the first part of the problem. It also shows, there are 198 parts. To find all solutions: ortogonbw Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8 2 >>output.txt ortogonbw Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8 3 >>output.txt ortogonbw Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8 4 >>output.txt ... ortogonbw Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8 198 >>output.txt The output also shows, there are 93 sub-parts to the first part. If it takes too long, it can be split further by adding another number to the command line. Different parts have different number of sub-parts.
34) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4385) Posted 1 Feb 2021 by Tomáš Brada Post: Can you give my assistant a program that finds the portions of ODLS? It is ortogonbw.exe from this forum. ortogonbw.exe: (Input) (Path) >output Search for Orthogonal mates of Diagonal Latin Square Input: encoded diagonal latin square (see dlkconv.exe) Output: metadata and orthogonal squares in encoded format Prints to output immediately as square is found. Single thread. Path: sequence of space-separated numbers narrowing the problem space Explanation: L(level) c(column) choosen-row / count-rows Specify number as Path from 1 up to count-rows to narrow down the Search, specify multiple numbers to narrow down further. Author: Tomas Brada (GPL) In this case, 1994 X was used for the path, where X was 1-819, then concatenated the output. Each took about minute and half. To obtain the full solution, the first number would have to go from 1 to 1994.
35) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4383) Posted 1 Feb 2021 by Tomáš Brada Post: I calculated and canonicalized orthogonal mates of DaUayP5fWmYHjcNNj3JnBN6rQXiMjg6, but only in path (1994). https://boinc.tbrada.eu/download/DaUay.1994.kan.txt There are 179685 ODLK in this fraction, which give 179437 CF ODLK. Because there are 1994 rows in the first column (30) and I only calculated one, there should be about 360 million ODLK.
36) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4381) Posted 31 Jan 2021 by Tomáš Brada Post: I canonicalized 2715194 mates of Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8, in parts. Used a split program to split the file into 5 parts, then ran kanonb on each, then ran sort -u on all of them to obtain 1074993 CF ODLK. https://boinc.tbrada.eu/download/Dv8yEzQnSZSx2gbK2JTvcP6FD7Sh7XQ8.kan.txt
37) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4375) Posted 26 Jan 2021 by Tomáš Brada Post: Natalia Makarova I changed some things in the programs, please try it and let me know if there are issues. Download windows build b1b4dc24f04: https://boinc.tbrada.eu/download/ndlk-2101b.zip * changed way encoded dlk is read in dlkconv, hopefully fixing crash on windows * improved speed of transversal counting ortogonb.exe -c * add kanonb -u mode, unique and sorted output * small change to ortogonbw output
38) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4372) Posted 18 Jan 2021 by Tomáš Brada Post: Use dlkconv es <a.txt ds >out.txt dlkconv ef a.txt df out.txt
39) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4369) Posted 18 Jan 2021 by Tomáš Brada Post: 98844 ODLK of order 12: https://boinc.tbrada.eu/download/DaUay.1994.1-400.txt.gz From DaUayP5fWmYHjcNNj3JnBN6rQXiMjg6 path (1994,1) to (1994,400). There are estimates 403 million other mates.
40) Message boards : Code and Servers : Diagonal Latin squares of order n>10 (Message 4368) Posted 15 Jan 2021 by Tomáš Brada Post: I think the CF sorting program should be in your software package. Moreover, it is better to do the sorting during the canonicalization process. There is no point in displaying duplicates. Okay, I will add a -u switch to my program, to output only unique and sorted results.

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