Orange Pi PC: suddenly all tasks are invalid
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Message boards : Number crunching : Orange Pi PC: suddenly all tasks are invalid

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manalog
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Joined: 5 Oct 15
Posts: 24
Credit: 336,677
RAC: 283
Italy
Message 1881 - Posted: 3 Jul 2020, 10:52:52 UTC

Hi all,
I got a small SBC, an Orange Pi PC, based on the Alwinner H3 SoC (quad-core cortex A7 1,3GHz). It crunched Tn-Grid successfully for a lot of time: a couple of year ago, achieving more than 150.000 credits (http://gene.disi.unitn.it/test/show_host_detail.php?hostid=1841), and this year for the last three months, together with OPN1 (http://gene.disi.unitn.it/test/show_host_detail.php?hostid=58468).
A couple of weeks ago it started returning all invalid tasks, with all the application provided by the server (vfp4, vfp3) that previously worked. It could seem like a problem of the board, but the strange thing is that it works perfectly on several other projects: OPN1, Universe@Home, Einstein@Home, WEP-M+2.
Thus I tried to compile an app targeted for this device

ARCH += -mcpu=cortex-a7 -mfpu=neon-vfpv4 -ftree-vectorize -march=native -mtune=native -Ofast -fprofile-use -fno-signed-zeros -fno-trapping-math -frename-registers -funroll-loops

The speed of execution improved a bit but same problem: all the results are invalid.

Are other people with ARM boards experiencing the same problem? My old android phone crunching on Tn-Grid is still working well...
What kind of test shall I do to figure out if the problem is in my board or in the project?
Thank you.


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