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lofar-astron / factor

Facet calibration for LOFAR
http://www.astron.nl/citt/facet-doc
GNU General Public License v2.0
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facetsub while facetselfcal in larger groups? #190

Closed AHorneffer closed 7 years ago

AHorneffer commented 7 years ago

Do I see it correctly that even in groups with several directions in it, the facetsub operations are only started after all facetselfcal operations have finished? Couldn't the first facetsub operation start as soon as the first facetselfcal operation finished successfully?

I can also see that it probably won't be trivial to implement that, but would there be any other problems except having to re-write a good portion of Factor?

P.S. I usually run Factor on a single workstation, so it is not important to me. P.P.S. In my recent run the facetselfcal took between 6 and 23 hours per facet and the facetsub took about 1 hour per facet. So the gain wouldn't be huge, but still significant.

AHorneffer commented 7 years ago

I guess I can answer my own question: It is important that no facetselfcal operation reads from the input data files while a facetsub operation is going on. And because the predict_and_difference_models step reads from the input data files, this would be a problem...