[Ilugc] Profiling a C program.
- From: girishvenkatachalam@xxxxxxxxx (Girish Venkatachalam)
- Date: Thu Mar 13 07:51:56 2008
On 00:00:40 Mar 13, Logu wrote:
I am trying to profile a simple C program, but I am not getting correct
values under the "cumulative seconds" and "self seconds" column for the
functions. I always get them as 0.00.
I compiled and linked the program with -pg option. But when I run the gprof
I only get this output
% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 5 0.00 0.00 pmesg
Could someone point me what I am missing here. I need to find the time
spent on each function calls.
I barely remember using gprof.
I have found the simple shell command time(1) to be far more easier to
use and helpful.
I remember gprof reporting huge amounts of data. How did you get just
one line?
There are plenty of profiling/monitoring tools in linux.
Why don't you try the other ones?
lsof(1), fstat(1) and so on.
I think you can simply
$ time ./a.out
for your immediate need.
As to why gprof results weird results, the answer might be far deeper
than what meets the eye.
As someone suggested you can try a few iterations.
-Girish
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