GNU gprof: Primary |
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The primary line in a call graph entry is the line that describes the function which the entry is about and gives the overall statistics for this function.
For reference, we repeat the primary line from the entry for function
report
in our main example, together with the heading line that
shows the names of the fields:
index % time self children called name … [3] 100.0 0.00 0.05 1 report [3]
Here is what the fields in the primary line mean:
index
Entries are numbered with consecutive integers. Each function therefore has an index number, which appears at the beginning of its primary line.
Each cross-reference to a function, as a caller or subroutine of another, gives its index number as well as its name. The index number guides you if you wish to look for the entry for that function.
% time
This is the percentage of the total time that was spent in this function, including time spent in subroutines called from this function.
The time spent in this function is counted again for the callers of this function. Therefore, adding up these percentages is meaningless.
self
This is the total amount of time spent in this function. This
should be identical to the number printed in the seconds
field
for this function in the flat profile.
children
This is the total amount of time spent in the subroutine calls made by
this function. This should be equal to the sum of all the self
and children
entries of the children listed directly below this
function.
called
This is the number of times the function was called.
If the function called itself recursively, there are two numbers, separated by a ‘+’. The first number counts non-recursive calls, and the second counts recursive calls.
In the example above, the function report
was called once from
main
.
name
This is the name of the current function. The index number is repeated after it.
If the function is part of a cycle of recursion, the cycle number is
printed between the function’s name and the index number
(see How Mutually Recursive Functions Are Described).
For example, if function gnurr
is part of
cycle number one, and has index number twelve, its primary line would
be end like this:
gnurr <cycle 1> [12]
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