Hey Toby,
I've double-checked the generator for the test-suite of the generated
matrices, and all layout/transpose combination work on my hardware on
rectangular matrices. To make sure the generated kernels are correct on
your hardware, you can run ./tests/generator_blas3-test-opencl...
Since the diagonal elements are correct, a synchronization problem is
unlikely, and it seems like the row-majors are mapped to a col-major, or
conversely. Does the problem appear when you mix layout with non-prod
operations?
Philippe
2013/8/26 Toby St Clere Smithe <m...@tsmithe.net>
> Hi all,
>
> I've implemented some more matrix operation tests in PyViennaCL, and
> I've come across a curious bug when doing operations like the following:
>
> A += B
> C = alpha * A + B
>
> where alpha is a scalar, A and C are dense row-major matrices, and B is
> a column-major dense matrix. One of these operations always fails, but
> it is not predictable which one, bizarrely. The only common factor
> across failures seems to be that the operations involve both a
> column-major and a row-major matrix. Most of the time, curiously, all
> the correct elements are along the main diagonal, and all the other
> elements are incorrect. Other times, the correct and incorrect elements
> seem randomly distributed (but I haven't investigated whether they are
> actually random); initially, the matrices are filled with random values.
>
> Don't count this as a bug report for ViennaCL yet, though -- I've not
> had time today to write an exactly equivalent test in C++; that's a task
> for tomorrow. (There is the unlikely possibility, of course, that the
> bug is in NumPy, which I am using as my benchmark..)
>
> Ciao,
>
> Toby
>
>
>
> ------------------------------------------------------------------------------
> Introducing Performance Central, a new site from SourceForge and
> AppDynamics. Performance Central is your source for news, insights,
> analysis and resources for efficient Application Performance Management.
> Visit us today!
> http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk
> _______________________________________________
> ViennaCL-devel mailing list
> ViennaCL-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/viennacl-devel
>
------------------------------------------------------------------------------
Introducing Performance Central, a new site from SourceForge and
AppDynamics. Performance Central is your source for news, insights,
analysis and resources for efficient Application Performance Management.
Visit us today!
http://pubads.g.doubleclick.net/gampad/clk?id=48897511&iu=/4140/ostg.clktrk
_______________________________________________
ViennaCL-devel mailing list
ViennaCL-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/viennacl-devel
