Originální popis anglicky:
profil - execution time profile
Návod, kniha: Linux Programmer's Manual
#include <unistd.h>
int profil(u_short *buf, size_t bufsiz, size_t
offset, u_int scale);
This routine provides a means to find out in what areas your program spends most
of its time. The argument
buf points to
bufsiz bytes of core.
Every virtual 10 milliseconds, the user's program counter (PC) is examined:
offset is subtracted and the result is multiplied by
scale and
divided by 65536. If the resulting value is less than
bufsiz, then the
corresponding entry in
buf is incremented. If
buf is NULL,
profiling is disabled.
Zero is always returned.
profil cannot be used on a program that also uses
ITIMER_PROF
itimers.
True kernel profiling provides more accurate results. Libc 4.4 contained a
kernel patch providing a system call profil.
Similar to a call in SVr4 (but not POSIX.1).
gprof(1),
setitimer(2),
sigaction(2),
signal(2)
