The --stagestats command

The --stagestats is a command-line option that is more Rakudo-specific than the others we have described earlier. It prints the time spent by the compiler at different stages of compiling and executing the program.

The output differs depending on whether you are running a program or checking its syntax with the -c command-line option. Let's first take a look at what is printed when the -c option is used:

$ perl6 --stagestats -c hello.pl

The output is as follows:

Stage start      :   0.000
Stage parse      :   0.107
Stage syntaxcheck: Syntax OK

Without the -c option, you will see more statistics, because the program will not only be compiled but also executed, as shown here:

$ perl6 --stagestats hello.pl

The regular output of the program is printed:

Stage start      :   0.000
Stage parse      :   0.327
Stage syntaxcheck:   0.000
Stage ast        :   0.000
Stage optimize   :   0.003
Stage mast       :   0.008
Stage mbc        :   0.000
Stage moar       :   0.000
Hello, World!