Share pass uses too much system memory for large combinatorial networks about yosys HOT 2 OPEN

Yes, a cmd line switch to disable this share pass would be great, ex. if -noshare existed to use in this case.

I would turn that switch on for this particular version of the design to disable share. The goal here is to continue to PnR and evaluate the timing of the large combinatorial path. So this version of code will never see real hardware, just collecting data.

However, given the data collected, the large comb. network is pipelined and that version of the design would benefit from turning share back on (not being all comb. shouldnt use a bunch of ram). That design absolutely runs on ecp5 does very cool stuff in hardware 🤓 https://blog.yosyshq.com/p/3d-raytracing/ <ghdl,yosys,nextpnr3

from yosys.

Yes, this is known/expected given the way share works. Although I didn't expect to need a -noshare option (like the synth pass has) for smaller devices, as I thought it's not likely to run into designs that cause excessive time/memory usage, but it seems you managed to find one. Is the design realistic/something you would actually want to run on an ecp5 board in practice, or more of a benchmark?

Either way, the only solution I can think of is not running share for this design.

from yosys.