Profiling C applications

Profiling C applications

Profiling C Applications - Assume you have the following program p1.c:

/* Program p1.c */
#include
#include

t1(int i)
{
printf("t1:%d\n", i);
}

t2(int j)
{
printf("t2:%d\n", j);
}

int main(void)
{
int i, j;

for (i = 0; i < 5; ++i) {
t1(i);
for (j = 0; j < 2; ++j) {
t2(j);
}
}
}

Compile the program as follows:

$ gcc -pg -g -o p1 p1.c
$ ./p1
t1:0
t2:0
t2:1
t1:1
t2:0
t2:1
t1:2
t2:0
t2:1
t1:3
t2:0
t2:1
t1:4
t2:0
t2:1

Next, to get the profile graph.

$ gprof -p -b p1
Flat profile:

Each sample counts as 0.01 seconds.
no time accumulated

% cumulative self self total
time seconds seconds calls Ts/call Ts/call name
0.00 0.00 0.00 10 0.00 0.00 t2
0.00 0.00 0.00 5 0.00 0.00 t1

Above note the 10 calls to t2 and 5 calls to t1.

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