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make layout.read faster?

jonathanjonathan
in Python scripting

Hi, I have a python script going through large designs exploring cells, for this I open the designs using layout.read but the command takes 30s-1m to get through.
I only need the cell informations (layout.top_cells() , layout.each_cell() , cell.name)

I wonder if there is any way to make it faster?

Comments

  • MatthiasMatthias

    If you have OASIS, it may store the top cell as an explicit property. Extracting that without reading the file is not a feature of KLayout, but I'm sure it's there is other tools. For example this one: https://github.com/klayoutmatthias/dump_oas_gds2 (look for "PROPERTY (name=S_TOP_CELL)").

    If not (or your OASIS flavor does not have this information), you can speed up reading somewhat by skipping the shape information:

    options = pya.LoadLayoutOptions()
options.create_other_layers = False

ly = pya.Layout()
ly.read(filename, options)

    You can't skip reading the cell tree as that one will be needed to determine the top cell(s).

    In some test cases I tried, this brought down the read times by 50%. Maybe the effect is much more pronounced if you have layouts that are heavy in shapes (i.e. flat ones).

    Matthias

  • jonathanjonathan

    Thanks! the layout option has cut the time in about 50% indeed! great step forward for me. So far dump_oas_gds2 does not seems to make it faster but I will keep investigating.

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