When testing why nidaqmx-python was taking so long to read data and write to HDF5, I naturally benchmarked h5py boolean write speed.
h5py boolean write speed results
|dtype||write time [sec]|
|list of bool > Numpy uint8||3.2e-2|
|list of bool||1.7e-2|
So the big penalty in writing boolean arrays from lists to HDF5 via
h5py is the conversion from list to Numpy array implicit in writing with
I determined that the order 10 ms
h5py boolean list/array write time was not the issue, rather it was the synchronous reading of digital IO that was jamming up the system.