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Maximum fifo depth limited to 64?

Allocateing 128 element fifo:

fifo = Fifo('test_fifo', FifoType.HOST_WO)
fifo_size = 128
fifo.allocate(device, graph.get_option(GraphOption.RO_INPUT_TENSOR_DESCRIPTORS)[0], fifo_size)

data = np.empty(shape=(32, 32)).astype(np.float32)
for i in range(fifo_size):
    print(i)
    fifo.write_elem(data, None)

write_elem starts blocking on iteration 64.

Is there some hidden limit to fifo sizes?

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