c - How to extend clock() execution time -


my c program can run more 3 hours. sake of experiment, want calculate duration time (i.e., execution time) taken program until finishes. use start = clock(); @ beginning of main(), @ end end = clock(), subtract end - start execution time. however, said here, clock_t clock(void) limited 72 minutes. how can enforce count whole execution time not 72 minutes?

the time() function specified in c89, c99, c11. has second resolution , spans more 30-bits worth of seconds. it's portable solution. in fact, i'd never heard of clock() until today. counting ticks want if need high resolution.

if don't need portable way measure cpu/execution time, use procfs. proc/self/stat's stime field , sysconf(_sc_clk_tck) should need.


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