CODEWITHSUNDEEP
c++copencl
Avraam Mavridis
Avraam Mavridis

Reputation: 8920

OpenCl code works on a machine but I am getting CL_INVALID_KERNEL_ARGS on another

I had the following code, which works well on a machine but I when I try to run it on another machine with better graphics card I am getting errors:

global[0] = 512; global[1] = 512;
local [0] = 16; local [1] = 16;
ciErrNum = clEnqueueNDRangeKernel(commandQueue, myKernel, 2, NULL, global, local, 0, NULL, &event);

Errors:

Error @ clEnqueueNDRangeKernel: CL_INVALID_KERNEL_ARGS
Error @ clWaitForEvents: CL_INVALID_KERNEL_ARGS

Any idea what is the problem?

Upvotes: 4

Views: 2199

Answers (1)

sharpneli
sharpneli

Reputation: 1621

How large are the buffer objects you are passing? __constant arguments are allocated from separate memory space and not from global memory so therefore you have probably ran out of constant memory.

The spec mandates that in full profile the device must support at minimum 4 __constant arguments with 64kB total in size. In embedded profile it's dropped to 1kB.

You can query the amount of constant memory available by checking the CL_DEVICE_MAX_CONSTANT_BUFFER_SIZE using clGetDeviceInfo. Most likely your devices support way more than this minimum requirement.

In most cases you should use the constant buffer if you are able as in general it is quite a lot faster than global memory.

In future you should provide more information on your question. Because if the error is CL_INVALID_KERNEL_ARGS one really needs to know what are the arguments to your kernel.

Upvotes: 6

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