c - Calculate execution time of all the function -

this project has many functions of them takes lot of time execute. now task find functions tasks of time.

here steps:

1. write macro calculate execution time

   #ifndef _calculate_exe_time_ #define _calculate_exe_time_  #include <time.h> #include <stdio.h>  #define calculate_exe_time static clock_t cet_start_time, cet_end_time; \ static float cet_expend_time, cet_total_expend_time;            \ static unsigned int cet_invoked_times = 0;                      \ cet_start_time = clock();                                       \  #define cet_before_return cet_end_time = clock(); \ cet_expend_time = (float)(cet_end_time - cet_start_time) / clocks_per_sec; \ cet_total_expend_time += cet_expend_time;                       \ printf("===%s:%s()  invoked_times=%u  expend_time=%.4fs  total_expend_time=%.4fs\n", \        __file__, __function__, ++cet_invoked_times, cet_expend_time, cet_total_expend_time);  #endif  // _calculate_exe_time_ 

2.put macros functions

static void john_register_one(struct fmt_main *format) {     calculate_exe_time      //         cet_before_return }  many other functions many other functions  static char *john_loaded_counts(void) {     calculate_exe_time      static char s_loaded_counts[80];      if (database.password_count == 1) {         cet_before_return return "1 password hash";     }      cet_before_return return s_loaded_counts; } 

3. run

   ===wordlist.c:mgetl()  invoked_times=1893  expend_time=0.0000s  total_expend_time=0.0082s ===cracker.c:crk_process_key()  invoked_times=1880  expend_time=0.0000s  total_expend_time=0.0097s ===cracker.c:crk_process_event()  invoked_times=10  expend_time=0.0000s  total_expend_time=0.0011s ===cracker.c:crk_password_loop()  invoked_times=235  expend_time=0.0000s  total_expend_time=208.5752s ===cracker.c:crk_salt_loop()  invoked_times=235  expend_time=0.0000s  total_expend_time=208.6260s ===cracker.c:crk_done()  invoked_times=1  expend_time=0.0000s  total_expend_time=0.0000s ===wordlist.c:get_progress()  invoked_times=2  expend_time=0.0000s  total_expend_time=0.0000s ===wordlist.c:save_state()  invoked_times=2  expend_time=0.0000s  total_expend_time=0.0000s ===wordlist.c:do_wordlist_crack()  invoked_times=1  expend_time=208.9100s  total_expend_time=208.9100s ===batch.c:do_wordlist_pass()  invoked_times=1  expend_time=208.9100s  total_expend_time=208.9100s ===batch.c:do_batch_crack()  invoked_times=1  expend_time=208.9109s  total_expend_time=208.9109s ===wordlist.c:get_progress()  invoked_times=3  expend_time=0.0000s  total_expend_time=0.0000s ===cracker.c:crk_get_key2()  invoked_times=1  expend_time=0.0000s  total_expend_time=0.0000s 

here questions:

i have put calculate_exe_time , cet_before_return all functions manually! it's huge work! is there way automatically?

i have thought put cet_before_return destructors can invoked after function returns. gcc not support class destructor.

i suggest using profile tool, vtune vs or instruments xcode don't need add ugly code calculate execution time, can slow down execution , make results less accurate. profiling tools provide more information，such locating performance bottlenecks.