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uforob
Journeyman III
‎11-25-2010 02:18 PM

clSetKernelArg and local memory

Can I use clSetKernelArg function to to set a  __local argument with an already assigned (initilized) variable?

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dravisher
Journeyman III
‎11-25-2010 02:35 PM

The OpenCL 1.1 specification (table 3.1, page 27) seems to be quite clear on there not being any way for the host to access the contents of local memory. So I'm pretty sure this is not possible (at least not in a standard/portable way).

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uforob
In response to dravisher
Journeyman III
‎11-27-2010 08:49 AM

Thank you, now I read that.

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uforob
In response to uforob
Journeyman III
‎11-29-2010 06:55 AM

Incidentally, in that reference what does exactly only static allocationfor kernel mean?

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dravisher
In response to uforob
Journeyman III
‎11-29-2010 06:58 AM

I believe it means that at compile time (when the OpenCL code is compiled, not the C/C++ code) the size of the local array must be known if it's declared in the kernel, while if it's allocated by the host through clSetKernelArg it's size need not be known by the OpenCL compiler.

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