@Tim Edwards As a multi-PDK install now gets large (with each sky130A, sky130B, gf180mcuA, gf180mcuB, gf180mcuC weighing in at around 1..2GB) I think the time has come to switch to zipped

.lib

.gds

and

.mag

files. Any idea how to establish this alongside OpenLane and OpenRoad?

Magic now reads compressed GDS, so I could do this right away. I need to do some work to get magic to read compressed

.mag

files (kind of embarrassing that klayout can read compressed .mag files but magic can't!). Nevertheless, the PDK .mag and .gds files are not all that big, so compressing them is not that big an issue. By far the largest amount of disk space is taken up by the liberty files. So if all tools agree on a compression standard, then I have no particular problem in getting open_pdks to compress the .lib libraries (qflow does not read compressed .lib files, but it's easy enough for me to add that).