perl -d:DProf stats.pl 是什么意思？

317550564

You run your program as shown above, but there is no additional information output onscreen beyond what your program normally displays.  
  Based on the scenario above, why is no profiling information shown?  
Choice 1   
Your code did not have any profiling hooks installed.  
Choice 2   
You did not specify which items to profile in your code.  
Choice 3   
You need to run dprofpp to display the statistics.  
Choice 4   
Your code calls a module that has an interface to C code and it cannot be profiled.  
Choice 5   
Your program has taint checking enabled, which disables profiling.  

sjdy521

Choice 3

羲之遗韵

You run your program as shown above

I see nothing above.