gcc -pg, but no gmon.out produced?

Some__Guy · 11-28-2009, 10:11 AM

Hi,

I'm having some trouble trying to profile my code. I'm just testing it out with a simple hello world program:

Code:

$ cat bar.c
#include <stdio.h>

int main(void)
{
	printf("Hello, world!\n");
	return 0;
}

However, when I compile and run it, no gmon.out is produced (as required by gprof):

Code:

$ gcc -o bar bar.c -pg && ./bar && ls ./gmon.out
Hello, world!
ls: ./gmon.out: No such file or directory

Is there anything obvious that I'm screwing up here? I'm running this on OS X 10.5.

Thanks.

khodeir · 11-29-2009, 06:48 AM

hmm try

Quote:

gcc bar.c -o bar.out

to compile the C file
and

Quote:

./bar.out

to run it

or try

Quote:

$ gcc -o bar bar.c -pg && ./bar && ls gmon.out

and tell me what happens

graemef · 11-29-2009, 09:25 AM

put your -pg switch before the input file

Code:

$ gcc -pg -o bar bar.c

Some__Guy · 11-30-2009, 12:14 AM

Quote:

Originally Posted by khodeir

hmm try

to compile the C file
and
to run it

or try

and tell me what happens

Code:

$ gcc -o bar bar.c -pg && ls gmon.out
Hello, world!
ls: gmon.out: No such file or directory

Quote:

Originally Posted by graemef

put your -pg switch before the input file

Code:

$ gcc -pg -o bar bar.c

Code:

$ gcc -pg -o bar bar.c && ls gmon.out
ls: gmon.out: No such file or directory

*confused*

graemef · 11-30-2009, 01:50 AM

Code:

gcc -Wall -pg -c bar.c
gcc -Wall -pg -o bar bar.o

Will compile and link you program, creating an executable with additional instructions that record the time spent in each function.

Code:

./bar

Will run the executable created above, with profiling data written to a file ‘gmon.out’ in the current directory
Now you can try:

Code:

ls -l

To see if the file has been created.

Some__Guy · 11-30-2009, 07:34 AM

Quote:

Originally Posted by graemef

Code:

gcc -Wall -pg -c bar.c
gcc -Wall -pg -o bar bar.o

Will compile and link you program, creating an executable with additional instructions that record the time spent in each function.

Code:

./bar

Will run the executable created above, with profiling data written to a file ‘gmon.out’ in the current directory
Now you can try:

Code:

ls -l

To see if the file has been created.

Code:

$ gcc -Wall -pg -c bar.c && gcc -Wall -pg -o bar bar.o && ./bar && ls -l
Hello, world!
total 48
-rwxr-xr-x  1 i_am_not_root  staff  13400 Nov 30 08:33 bar*
-rw-r--r--  1 i_am_not_root  staff     78 Nov 25 23:17 bar.c
-rw-r--r--  1 i_am_not_root  staff    556 Nov 30 08:33 bar.o

It sounds like this may be a bug with Leopard.

oldardy · 06-25-2011, 10:17 AM

gcc bar.c -pg -o bar
./bar
gprof bar

is my solution (works on kubuntu 11.04)

oldardy