Completed, marked as invalid


Advanced search

Message boards : Number crunching : Completed, marked as invalid

Author Message
JZD
Send message
Joined: 30 Dec 11
Posts: 89
Credit: 3,019,392
RAC: 558
Message 13219 - Posted: 7 Sep 2014, 9:42:35 UTC

Can someone please explain what is wrong in my workunit? 8185967, 8185828

Profile DoctorNow
Project donor
Avatar
Send message
Joined: 11 Apr 05
Posts: 392
Credit: 2,167,694
RAC: 81
Message 13220 - Posted: 7 Sep 2014, 11:12:43 UTC
Last modified: 7 Sep 2014, 12:05:09 UTC

Your results are coming from a Linux machine and your wingmen were Windows-hosts.
It's a more or less common problem here that results from Linux mostly don't match against Windows ones.

Edit:
Not sure if there will be a solution for this sometime, I guess it was mentioned anywhere on the forum if I remember correctly.
____________
Life is Science, and Science rules. To the universe and beyond
Proud member of BOINC@Heidelberg
My BOINC-Stats

Achim
Send message
Joined: 17 May 05
Posts: 182
Credit: 2,505,702
RAC: 0
Message 13225 - Posted: 8 Sep 2014, 19:42:28 UTC - in response to Message 13220.

There is a possible local burp (not blender) solution: send the WU only to the same host type. This would solve the validation problem (mst likely) but might cause some flickering.

JZD
Send message
Joined: 30 Dec 11
Posts: 89
Credit: 3,019,392
RAC: 558
Message 13232 - Posted: 11 Sep 2014, 10:30:32 UTC - in response to Message 13220.

You are right. It will address the forum, but without result.

Nathaniel
Send message
Joined: 10 Sep 14
Posts: 1
Credit: 63,294
RAC: 0
Message 13463 - Posted: 13 Dec 2014, 16:07:56 UTC

Is it possible to mark entire sessions as Windows-only or Linux-only? This would stop the flickering as well as fix the Windows/Linux discrepancies.

An extra benifit is that the submitter could have it rendered in the same OS as the scene was made in. The result would better match what the submitter intended.

The problem is that half or more of the computers will be idle when all of available sessions use the same OS. The admins could manually load-balance when accepting sessions, but that won't be perfect. This is partially offset by having less wasted tasks because of the OS incompatibility.

Profile Steve Hawker*
Send message
Joined: 6 Nov 12
Posts: 13
Credit: 98,551
RAC: 0
Message 13471 - Posted: 15 Dec 2014, 20:04:26 UTC - in response to Message 13220.

Your results are coming from a Linux machine and your wingmen were Windows-hosts.
It's a more or less common problem here that results from Linux mostly don't match against Windows ones.


I'm not sure that's the case.

Since funkydude got me up and running with the "native" solution, I've run about 50 tasks. Some have error while computing, half are marked as invalid with just 7 valids.

Of those seven, six had Windows wingmen for my Linux box. Sampling the invalids, I find quite a few Linux + Windows = Valid.

Based on this entirely unscientific survey, I suggest that the validator maybe needs looking at, not a cross-platform problem.
____________

Profile DoctorNow
Project donor
Avatar
Send message
Joined: 11 Apr 05
Posts: 392
Credit: 2,167,694
RAC: 81
Message 13473 - Posted: 16 Dec 2014, 6:35:58 UTC - in response to Message 13471.
Last modified: 16 Dec 2014, 6:40:11 UTC

I'm not sure that's the case.

...

Based on this entirely unscientific survey, I suggest that the validator maybe needs looking at, not a cross-platform problem.

Well, maybe I explained it a bit wrong and it isn't that often the case, but AFAIK - and I can remember Janus did explain that somewhere on the forum why that's the case - it is an app problem since the outputs between Linux and Windows do vary from time to time due to different reasons (don't know the exact description anymore, it's been a while ;-)
I guess changing something on the validator wouldn't help here when it's app-based.
Please correct me if I'm wrong on this, Janus. ;-)
____________
Life is Science, and Science rules. To the universe and beyond
Proud member of BOINC@Heidelberg
My BOINC-Stats

Profile Janus
Volunteer moderator
Project administrator
Avatar
Send message
Joined: 16 Jun 04
Posts: 4467
Credit: 2,094,806
RAC: 0
Message 13475 - Posted: 16 Dec 2014, 19:15:18 UTC

That's about right. The validator is even being less strict than usual - probably those 7 units that passed would have been marked as invalid a few months ago.

We're definitely looking into the possibility of splitting the farm; I think Nathaniel summed up the main issues fairly well in the post above. Additionally there is the issue of there being a lot fewer Linux machines than Windows ones so Linux could quickly end up being the "unpopular platform" as for rendering performance.
That said, this exact setup was tested during the Sunflower event where the Linux machines completely outperformed the Windows ones on certain very specific task types (like very long uninterruptible workunits for example). Sunflower workunits were not shared between platforms.

The last remaining point in this is that GPU rendering could potentially fragment the farm even further. Data is still being analyzed from the first Windows GPU tests with preliminary positive results in terms of performance but issues with credit; another, similar, test for CUDA on Linux is scheduled for the new year.

We may end up with a 4-way split and not just 2.

Achim
Send message
Joined: 17 May 05
Posts: 182
Credit: 2,505,702
RAC: 0
Message 13879 - Posted: 20 Jun 2015, 11:46:53 UTC

I just found quite a few WUs, where the fight is not only Linux vs Windows:
http://burp.renderfarming.net/workunit.php?wuid=2470715

Currently 4 different results...

Speedy
Send message
Joined: 25 May 06
Posts: 206
Credit: 657,348
RAC: 0
Message 13893 - Posted: 21 Jun 2015, 22:07:39 UTC

I appreciate that sometimes you don't get credit for work. In saying this I feel it is incredibly unfortunate that I did not receive any credit for task 8682732 it took 80.35 hours that is just over 2 working weeks. I accept it did miss the deadline however the deadlines are not set hard and fast here. I would be very interested to know why I didn't receive any credit for it. Task ran on 15 cores out of my total of 16
____________

Have a crunching good day!!
Live in NZ y not join Smile City?

Alez
Send message
Joined: 22 Jun 15
Posts: 2
Credit: 154,467
RAC: 0
Message 13897 - Posted: 3 Jul 2015, 15:29:13 UTC
Last modified: 3 Jul 2015, 15:41:50 UTC

Is this the reason that nearly ever single MT task running on my xeon server with ubuntu 14.04 LTS is failing or is there something I am missing ?

If this is the case then other than racking up hours on WUProp there is very little point in me running this any longer. My computers are unhidden if someone with more experience on this project would care to comment or point me in the right direction. Thanks.

It's this server http://burp.renderfarming.net/show_host_detail.php?hostid=66375


edit
From what I can see I have 3 valid tasks, all against other linux hosts, 14 invalid tasks all ran to full completion and failed to validate against win computers. Is this accurate ? Seems I am wasting my time

JZD
Send message
Joined: 30 Dec 11
Posts: 89
Credit: 3,019,392
RAC: 558
Message 13901 - Posted: 5 Jul 2015, 22:08:18 UTC - in response to Message 13897.

Credit you get when payday. Janus informs. http://burp.renderfarming.net/forum_thread.php?id=2632&nowrap=true#13822

Alez
Send message
Joined: 22 Jun 15
Posts: 2
Credit: 154,467
RAC: 0
Message 13906 - Posted: 6 Jul 2015, 18:40:43 UTC - in response to Message 13901.

Credit you get when payday. Janus informs. http://burp.renderfarming.net/forum_thread.php?id=2632&nowrap=true#13822


Thanks very much for that. It's not so much the credit lost, it's the wasted cycles if linux will not validate against windows, but if this will help to solve this problem them I will keep at it.

funkydude
Send message
Joined: 23 Dec 13
Posts: 275
Credit: 2,478,281
RAC: 0
Message 13908 - Posted: 6 Jul 2015, 23:01:27 UTC - in response to Message 13906.

Thanks very much for that. It's not so much the credit lost, it's the wasted cycles if linux will not validate against windows, but if this will help to solve this problem them I will keep at it.


To my knowledge, failing to validate isn't a BURP issue, but rather a Blender issue with rendering differences between Linux and Windows, these will only be fixed with time and newer versions (and hopefully whatever BURP projects Janus is reporting to the Blender team).

Feel free to correct me if I'm wrong Janus.

Personally I've noticed a decline in the amount of tasks my Linux machines render and get rejected.


Post to thread

Message boards : Number crunching : Completed, marked as invalid