Gprof
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Gprof allows for profiling a program, so you can analyze where your program passes most of its time in order to increase performance by modifying the code. The program must be compiled with a profiling option or available in the sourcecode. Then you will do a test run to collect profiling data. The results will be based on this test run.
Example
- Write main.cpp:
#include <iostream>
int main()
{
std::cout << "hello world" << std::endl;
}
- Build it using the pg option:
gcc -Wall -c -pg main.cpp gcc -Wall -lstdc++ -pg main.o
- Call it so you get profile data from one run:
./a.out
- Verify you have the profile file:
# ls gmon.out gmon.out
- Call gprof:
# gprof 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 1 0.00 0.00 global constructors keyed to main 0.00 0.00 0.00 1 0.00 0.00 __static_initialization_and_destruction_0(int, int) [...]