Incompatibilities with Unix `gprof'
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GNU `gprof' and Berkeley Unix `gprof' use the same data file
`gmon.out', and provide essentially the same information. But there
are a few differences.
* GNU `gprof' uses a new, generalized file format with support for
basic-block execution counts and non-realtime histograms. A magic
cookie and version number allows `gprof' to easily identify new
style files. Old BSD-style files can still be read. Note:File
Format.
* For a recursive function, Unix `gprof' lists the function as a
parent and as a child, with a `calls' field that lists the number
of recursive calls. GNU `gprof' omits these lines and puts the
number of recursive calls in the primary line.
* When a function is suppressed from the call graph with `-e', GNU
`gprof' still lists it as a subroutine of functions that call it.
* GNU `gprof' accepts the `-k' with its argument in the form
`from/to', instead of `from to'.
* In the annotated source listing, if there are multiple basic
blocks on the same line, GNU `gprof' prints all of their counts,
separated by commas.
* The blurbs, field widths, and output formats are different. GNU
`gprof' prints blurbs after the tables, so that you can see the
tables without skipping the blurbs.