Following are examples of rb_flowinfo.d.
This is a simple script to trace the flow of Ruby methods. Here it traces the
example program, Code/Ruby/func_abc.rb.
C PID DELTA(us) FILE:LINE TYPE -- NAME
0 146395 2 func_abc.rb:3 method -> Module::method_added
0 146395 26 func_abc.rb:3 method <- Module::method_added
0 146395 25 func_abc.rb:8 method -> Module::method_added
0 146395 11 func_abc.rb:8 method <- Module::method_added
0 146395 16 func_abc.rb:14 method -> Module::method_added
0 146395 10 func_abc.rb:14 method <- Module::method_added
0 146395 15 func_abc.rb:20 method -> Object::func_a
0 146395 12 func_abc.rb:15 method -> Object::print
0 146395 20 func_abc.rb:15 method -> IO::write
0 146395 110 func_abc.rb:15 method <- IO::write
0 146395 11 func_abc.rb:15 method <- Object::print
0 146395 11 func_abc.rb:16 method -> Object::sleep
0 146395 1003728 func_abc.rb:16 method <- Object::sleep
0 146395 35 func_abc.rb:17 method -> Object::func_b
0 146395 20 func_abc.rb:9 method -> Object::print
0 146395 12 func_abc.rb:9 method -> IO::write
0 146395 42 func_abc.rb:9 method <- IO::write
0 146395 11 func_abc.rb:9 method <- Object::print
0 146395 11 func_abc.rb:10 method -> Object::sleep
0 146395 1009976 func_abc.rb:10 method <- Object::sleep
0 146395 35 func_abc.rb:11 method -> Object::func_c
0 146395 20 func_abc.rb:4 method -> Object::print
0 146395 12 func_abc.rb:4 method -> IO::write
0 146395 38 func_abc.rb:4 method <- IO::write
0 146395 11 func_abc.rb:4 method <- Object::print
0 146395 11 func_abc.rb:5 method -> Object::sleep
0 146395 1009883 func_abc.rb:5 method <- Object::sleep
0 146395 29 func_abc.rb:5 method <- Object::func_c
0 146395 12 func_abc.rb:11 method <- Object::func_b
0 146395 11 func_abc.rb:17 method <- Object::func_a
^C
As each method is entered, the last column is indented by 2 spaces. This
shows which method is calling which.
The DELTA(us) column shows the change in time from the previous line to the
current line.
The LINE column shows the line in the file what was being executed. Refer
to the source program to see what this line refers to.
If the output looks shuffled, check the CPU "C" column - if it changes,
then the output is probably shuffled. See Notes/ALLsnoop_notes.txt for
details and suggested workarounds.
See Notes/ALLflow_notes.txt for important notes about reading flow outputs.