CODEWITHSUNDEEP
pythonopenclpyopencl
ImASausage
ImASausage

Reputation: 1

pyopencl: "clEnqueueReadBuffer failed: INVALID_VALUE"

I have attempted to search for a solution or possible cause for this but I cant find anything.

Python 3.9 / pyopencl 2022.3.1

Getting Context / Queue:

PLATFORM = cl.get_platforms()[0]
DEVICE = PLATFORM.get_devices()[0]
CTX = cl.Context([DEVICE])
QUEUE = cl.CommandQueue(CTX)

Buffer Creation:

InputBuffer = cl.Buffer(CTX, cl.mem_flags.READ_WRITE, size=inputs.nbytes)
cl.enqueue_copy(QUEUE, InputBuffer, inputs).wait()

Faulty Code:

output = np.empty(InputBuffer.size, dtype=np.float32)    
cl._enqueue_read_buffer(QUEUE, InputBuffer, output)

InputBuffer is a Buffer object, with a size that can vary but with my current tests, 8.

P.S. InputBuffer is a test buffer but stores the same data as the OutputBuffer. Its just changed later in the code

What I want to happen is to store the data in the "buffer" to a numpy array named "output"

So far I have tried: Using a different dtype (np.float64), No effect Using .wait(), No effect

Currently raises this error:

cl._enqueue_read_buffer(QUEUE, InputBuffer, output)
pyopencl._cl.LogicError: clEnqueueReadBuffer failed: INVALID_VALUE

Upvotes: 0

Views: 131

Answers (1)

Edward Murphy
Edward Murphy

Reputation: 1

The error is on this line:

output = np.empty(InputBuffer.size, dtype=np.float32)

Note that InputBuffer.size is equal to inputs.nbytes.

Change the line to this:

output = np.empty_like(inputs)

That should fix it.

Upvotes: 0

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