DC里的set_critical_range什么意思

DC脚本里有这样一行：
set_critical_range 2 [current_design]
请问，这句是什么意思呀,set_critical_range 后边数字2代表什么?
O(∩_∩)O谢谢！

man不就看明白了吗?

Critical range specifies a margin of delay for path groups in optimization.   This  must be a positive float number or 0.0.  A critical rangeof 0.0 means that only the most critical paths (the ones with the worst violation)  are  optimized.   If  you specify a nonzero critical range,
near-critical paths within that amount of the worst path will  also  be optimized, if possible.
明白了，下午没好好看，就没有看懂……

我也明白了，谢了

学习了，感谢分享！