The call-graph profile
The call-graph profile is the first part of the cwhet.gprof file.
granularity: each sample hit covers 4 byte(s) Time: 62.85 seconds
called/total parents
index %time self descendents called+self name index
called/total children
19.44 21.18 1/1 .__start [2]
[1] 64.6 19.44 21.18 1 .main [1]
8.89 0.00 8990000/8990000 .mod8 [4]
5.64 0.00 6160000/6160000 .mod9 [5]
1.58 0.00 930000/930000 .exp [6]
1.53 0.00 1920000/1920000 .cos [7]
1.37 0.00 930000/930000 .log [8]
1.02 0.00 140000/140000 .mod3 [10]
0.63 0.00 640000/640000 .atan [12]
0.52 0.00 640000/640000 .sin [14]
0.00 0.00 10/10 .pout [27]
-----------------------------------------------
<spontaneous>
[2] 64.6 0.00 40.62 .__start [2]
19.44 21.18 1/1 .main [1]
0.00 0.00 1/1 .exit [37]
-----------------------------------------------Usually the call graph report begins with a description of each column of the report, but it has been deleted in this example. The column headings vary according to type of function (current, parent of current, or child of current function). The current function is indicated by an index in brackets at the beginning of the line. Functions are listed in decreasing order of CPU time used.
To read this report, look at the first index [1] in the left-hand column. The .main function is the current function. It was started by .__start (the parent function is on top of the current function), and it, in turn, calls .mod8 and .mod9 (the child functions are beneath the current function). All the accumulated time of .main is propagated to .__start. The self and descendents columns of the children of the current function add up to the descendents entry for the current function. The current function can have more than one parent. Execution time is allocated to the parent functions based on the number of times they are called.