User talk:Masterzorag

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Revision as of 15:24, 28 August 2012 by Masterzorag (talk | contribs) (Tested Linux 3.5.3)
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SPU Problems on Linux 3.x, OpenCL related 

As far as I know, I'm the only coding OpenCL on the Cell here, if someone want to test something be warned that it's stable until 3.2 branch.
This due some spufs changes that ppc-kernel-devs are (maybe) trying to fix, so now latest 3.3/3.4 branches falls into 'possible circular locking dependency detected' and slowdown runtime.
Even disabling lock debugging it slowdowns runtime without debug messages, it happens even with OpenCL samples from IBM.

http://permalink.gmane.org/gmane.linux.ports.ppc.embedded/50547

Tested kernels:

  • 3.2.23 works fine
  • 3.3.3 falls into 'possible circular locking dependency detected' and slowdown runtime
  • 3.4.6 falls into 'possible circular locking dependency detected' and slowdown runtime
  • 3.5.3 falls into 'possible circular locking dependency detected' and slowdown runtime

When program runs, OpenCL builtin function to query available SPEs reply 8 (!), so seems that the issue is OpenCL related.

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