I tried to use adaptive subdivisions, dicing is not working, or it seems so, I did not file a bug yet because my build is not from today, but I have a deadline, so I don’t want to change to another build, but I wanted to share this just in case it’s a known problem.
A plane with some displacement, normal Subdiv modifier (not as detailed): 700Mb or Ram
A plane with adaptive subdivisions, dicing at 2 pixels: 5.5Gb or RAM
A plane with adaptive subdivisions, dicing at 16 pixels: 5.5Gb or RAM, exact same visual result, no matter if I change the dicing on the subdiv modifier or in the cycles settings, RAM use is totally absurd and it does not react.
This question may be for @sergey or @brecht probably.
Cheers.