Hi Toby,
ViennaCL's core cannot switch_context() internally because the context is
not registered in the backend. We could querry the necessary information
using the OpenCL API and create the appropriate queues/devices/programs for
registering the context, though, since the handles are accessible through
the OpenCL API.
The generator using current_context() is an error. The context should be an
argument and the linalg operations should pass the vector's context. I'll
fix this tonight. I've been busy with other things today :)
Philippe
2014-07-03 18:25 GMT+02:00 Toby St Clere Smithe <m...@tsmithe.net>:
> Hey Philippe, all,
>
> After talking earlier about switch_context() and current_context(), I'm
> not sure why I should have to call these explicitly in most cases. If
> I'm performing an operation on two objects (both explicitly constructed
> with the same context), shouldn't ViennaCL implicitly switch_context()
> so that the current_context is that of the two objects in the operation?
>
> In this case, I'm copying data to a vector, and the device-specific
> kernel uses current_context() (which returns a different context to that
> with which the vector was constructed, thus giving an invalid command
> queue). Shouldn't the relevant dispatch function compare
> current_context() with that of the operand(s), and if current_context()
> is different, call switch_context()? Is there any case where this
> wouldn't work, and switch_context() would need to be called by the user
> explicitly? I think we should be able to assume that the user will
> always provide operands each with the same context; at least, I
> guarantee that this is the case in PyViennaCL.
>
> Cheers,
>
> Toby
>
>
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