萌新求助，man了一下route_opt，对-size_only选项中关于effort的sizing不理解，求助啊

kleinessen

萌新求助，man了一下route_opt，对-size_only选项中提到的关于effort的sizing不太理解，man后具体如下by default，the tool runs medium effort optimization,which enables in-place size-only optimization.To use footpinrt swapping,set the -effort option to low.To use regular density-based sizing,set the -effort option to high
求助，in-place size-only，foorprint swapping，是啥概念啊？density-based sizing大概是啥啊？不理解啊
萌新谢过了先~~~