I ran ruby-profiler on one of my programs. I&#39;m trying to figure out what each fields mean. I&#39;m guessing everything is CPU time (and not wall clock time), which is fantastic. I want to understand what the &quot;---&quot; stands for. Is there some sort of stack information in there. What does calls a/b mean?

    Thread ID: 81980260
    Total Time: 0.28
    
      %total   %self     total      self      wait     child            calls   Name
    --------------------------------------------------------------------------------
                          0.28      0.00      0.00      0.28              5/6     FrameParser#receive_data
     100.00%   0.00%      0.28      0.00      0.00      0.28                6     FrameParser#read_frames
                          0.28      0.00      0.00      0.28              4/4     ChatServerClient#receive_frame
                          0.00      0.00      0.00      0.00             5/47     Fixnum#+
                          0.00      0.00      0.00      0.00              1/2     DebugServer#receive_frame
                          0.00      0.00      0.00      0.00            10/29     String#[]
                          0.00      0.00      0.00      0.00            10/21     &lt;Class::Range&gt;#allocate
                          0.00      0.00      0.00      0.00            10/71     String#index
    --------------------------------------------------------------------------------
     100.00%   0.00%      0.28      0.00      0.00      0.28                5     FrameParser#receive_data
                          0.28      0.00      0.00      0.28              5/6     FrameParser#read_frames
                          0.00      0.00      0.00      0.00             5/16     ActiveSupport::CoreExtensions::String::OutputSafety#add_with_safety
    --------------------------------------------------------------------------------
                          0.28      0.00      0.00      0.28              4/4     FrameParser#read_frames
     100.00%   0.00%      0.28      0.00      0.00      0.28                4     ChatServerClient#receive_frame
                          0.28      0.00      0.00      0.28              4/6     &lt;Class::Lal&gt;#safe_call
    --------------------------------------------------------------------------------
                          0.00      0.00      0.00      0.00              1/6     &lt;Class::Lal&gt;#safe_call
                          0.00      0.00      0.00      0.00              1/6     DebugServer#receive_frame
                          0.28      0.00      0.00      0.28              4/6     ChatServerClient#receive_frame
     100.00%   0.00%      0.28      0.00      0.00      0.28                6     &lt;Class::Lal&gt;#safe_call
                          0.21      0.00      0.00      0.21              2/4     ChatUserFunction#register
                          0.06      0.00      0.00      0.06              2/2     ChatUserFunction#packet
                          0.01      0.00      0.00      0.01            4/130     Class#new
                          0.00      0.00      0.00      0.00              1/1     DebugServer#profile_stop
                          0.00      0.00      0.00      0.00             1/33     String#==
                          0.00      0.00      0.00      0.00              1/6     &lt;Class::Lal&gt;#safe_call
                          0.00      0.00      0.00      0.00              5/5     JSON#parse
                          0.00      0.00      0.00      0.00              5/8     &lt;Class::Log&gt;#log
                          0.00      0.00      0.00      0.00              5/5     String#strip!
    --------------------------------------------------------------------------------



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Understanding ruby-prof output