MultiBeam application for ATi GPUs released

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Profile Mike Special Project $75 donor
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Message 1099162 - Posted: 20 Apr 2011, 16:33:51 UTC
Last modified: 20 Apr 2011, 16:34:12 UTC

I once had the same issue on my card.
It was a bunch of bad downloads.

Had more than 30 units errored exatly the same second.
So i aborted the rest of them.
It never happened again.
So i expect it was the units.
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Message 1099165 - Posted: 20 Apr 2011, 16:43:16 UTC - in response to Message 1099113.  

I noticed mutliple errored WU's all ending at exactly 2988 seconds. I thought this was a bit odd and did a little search. I found that the Flops in the App_info may be a cause of this error. I also found this also my be due to registry entries. Since I've been uninstalling and installing the ATI drivers its a possibility that the old drivers left behind traces on the registry which may have caused the OpenCL to fail to load.

one of the 4 that had identical run times

http://setiathome.berkeley.edu/result.php?resultid=1877108620


The next time I install the ATI app, I plan on using the 1.0e11 flops entry as that is what works fine on Collatz and Milkyway.

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Message 1099172 - Posted: 20 Apr 2011, 16:50:59 UTC - in response to Message 1099165.  

I read on the BOINC FAQ that the flop count is a reason for it to fail. IIRC it was mentioned on Lunatics that the flops wasn't necessary.


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Message 1099189 - Posted: 20 Apr 2011, 17:33:46 UTC

Flops are not necessary - the server will take care of flops once ten WUs have validated.
The problem is the transition phase until that tenth validation comes through. Your client will start adjusting dcf accordning to the shorter runtimes seen. The server then uses the same dcf once the tenth validation goes through - expecting client dcf to be near one where it can be as low as oh .1. The result is that WUs are suddenly grossly underestimated - until the next gets finished and dcf shoots up again. In that window between the 1st fetch after 10th valid and next completed WU you can get massive overfetch. Having correct flops set in the app_info will keep dcf near 1 and avoid that particular problem. Without flops you better pay close attention to your valid count or you run with small cache until it's through.
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Message 1099203 - Posted: 20 Apr 2011, 18:02:13 UTC

You could bypass that problem by using Freds Rescheduler.
It's also fixes the -177 problem.
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Message 1099206 - Posted: 20 Apr 2011, 18:13:06 UTC - in response to Message 1099203.  

rescheduler isn't necessary for ATI cards. The App runs the VLAR WU's just fine.


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Message 1099222 - Posted: 20 Apr 2011, 18:37:45 UTC - in response to Message 1099206.  

rescheduler isn't necessary for ATI cards. The App runs the VLAR WU's just fine.

The rescheduler doesn't only reschedule, it also (separately) fixes the -177 problem.

Gruß,
Gundolf
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Message boards : Number crunching : MultiBeam application for ATi GPUs released


 
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