Most of the time its more an annoyance than a problem. It does become a problem when two errant PCs work on the the same work unit and return the same wrong result, which gets incorporated into the project science database.
(A lot of effort is put in by the team members to ensure that from one build to the next the correct data is returned by correctly functioning applications, and as far as possible builds that return errors or incorrect results are consigned to an early bath)
Ah, so it is possible that multiple systems produce the same errors rather than random errors, which then results in the erroneous data being considered confirmed.
I had expected that errors, resulting from overclocked/overheated components, are not easily reproducible. But I have to admit that this sort of hardware problems are definitely not my strong side. I know a lot more when it comes to databases and networking issues.
I just sent a PM to user jedi, host 5925627. It has 221 invalids and 292 inconclusives. Worse, it has 221 valids that are suspect.
http://setiathome.berkeley.edu/workunit.php?wuid=1669848312 is one of those that ran as v6, but somehow managed to validate.
That's pretty much how all of them look until they finally fill up with invalids. At least in my experience.
Something very strange with that one - far too many tasks "in progress", no credit, no valid results, all completed tasks actually timed out, some "in progress" tasks with very long deadlines (two months!!).
ET seems to be trying to phone home, but the user may have suspended the tasks/project and thus they didn't get completed.
No response so far, still waiting. Anyone else who want's to send personal message to this user? Maybe some who can speak Italian?
I do have feeling that something is preventing to crunch units, like antivirus software or something else?
Something did happen, host hasn't contacted servers since 19th. At least there are no more workunits sent this host, although we have to wait at least to 17th of March to all workunits cleared.
Being a relative newcomer, I'm not comfortable with messaging other users about possible problems with -their- systems. This one, though, 6734838, seems to be trashing about 50% of WUs.
Reputation based validation (solves the problem that two rogue computers agree on an overflowed result, which would be entered into the DB as a true result)
No computer with many invalids, or errors, should be allowed to get the canonical result. If both wingmen agree on a result, and they both have bad reputation, the WU should be sent out to another computer, or maybe two computers.
Reputation based granting of new WU's. No computer with lots of invalids or errors should be given more than one task each day. If they fix their crap, the reputation will improve, and they will be given more WU's.
This will not increase the demand on the project system, even if more WU's are sent out to be recrunched. All the thousands upon thousands of WU's the broken systems also trash immediately, will no longer be sent out, due to the Reputation based granting of new WU's.
7378919 doesn't have a noteworthy total, but noticed because this host has been wing man for a number of my inconclusives:
No pm sent to either yet; any recommendations I could make to them? I haven't been hanging around the forum long enough to know the specifics of problematic GPU/driver combinations, etc.
One host from a veteran user that's had 212 tasks with -185 (0xffffffffffffff47) ERR_RESULT_START exit status since 12 Jan 2015, no valid results:
This applies to my graphics card CPU (GeForce GT740, clock speed 1084MHz with 4Gb memory)running SETI.
couldn't start app: CreateProcess() failed - The process cannot access the file because it is being used by another process.
I think that it is the Graphics drivers - have rolled back drivers and am now waiting to see results.
There is another post '@PRE-FERMI NVidia GPU users: Important warning' which states that there are issues with NVidia driver versions.
If this fails then I will remove all drivers and software for GPU and re-install the ones on the CD supplied with it when purchased in November as I have had no problems until the last two driver updates this year.
SETI@home and Astropulse are funded by grants from the National Science Foundation, NASA, and donations from SETI@home volunteers. AstroPulse is funded in part by the NSF through grant AST-0307956.
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