The profiling tool in GNU is called gprof. Here is a short, boring example of how to use it.
1) Write hello world in C (hello.c)
<
pre lang=”c”>
#include <stdio.h>
int foo() {
int b = 54324;
int j;
for (j=0; j < 1000000; j++) {
b = b^j;
}
return b;
}
int main() {
int a = 321782;
int i;
for(i=0; i<1000; i++) {
a = a ^ foo();
}
printf(“Hello foo: %d\n”, a);
return 0;
}
}
2) Compile with -pg option
gcc -pg hello.c
3) Run the program to generate profiling information
./a.out # this generates gmon.out file
4) Run gprof on the program and read output in less:
gprof a.out gmon.out | less