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From:	Hans-Bernhard Broeker <broeker AT physik DOT rwth-aachen DOT de>
Newsgroups:	comp.os.msdos.djgpp
Subject:	Re: Profiling application
Date:	14 Dec 2001 16:36:42 GMT
Organization:	Aachen University of Technology (RWTH)
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Alex Oleynikov <alex AT compuweigh DOT com> wrote:

> I am trying to profile my application (compiled with DJGPP v.2.03,
> gcc v.2.95.3, binutils v.2.10). I have compiled it with -pg and -a
> switches and ran. It produces a file bb.out (BTW, DJGPP FAQ talks
> about gmon.out, do I have to rename it afterwards?) with some
> statistics.

You got it partly wrong. '-a' is not really for profiling: it's for
line-by-line execution counting.  Try again, without '-a', and you'll
be better off, I guess.  If you really want execution counts per
source line, I recommend using "gcov" and gcc options "-fprofile-arcs
-ftest-coverage" instead.

IIRC, -pg and -a don't work together at all. That's the reason why you
didn't get the gmon.out file.  Note that you have to *link* with -pg,
too, not just compile.

> Now, every time I try to run my profiler (gprof app.exe bb.out) it exits
> with a message: "d:/djgpp/bin/gprof.exe: Cannot allocate 1087817412 bytes"

That's because bb.out is the wrong type of input file, and gprof
doesn't really check whether the file you gave it is a valid
"gmon.out" format file.
-- 
Hans-Bernhard Broeker (broeker AT physik DOT rwth-aachen DOT de)
Even if all the snow were burnt, ashes would remain.

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