profil

PROFIL(3)                  Linux Programmer's Manual                 PROFIL(3)



NAME
       profil - execution time profile

SYNOPSIS
       #include <unistd.h>

       int profil(u_short *buf, size_t bufsiz, size_t offset, u_int scale);

DESCRIPTION
       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, profil-
       ing is disabled.

RETURN VALUE
       Zero is always returned.

BUGS
       profil  cannot be used on a program that also uses ITIMER_PROF itimers.

       True kernel profiling provides more accurate results.   Libc  4.4  con-
       tained a kernel patch providing a system call profil.

CONFORMING TO
       Similar to a call in SVr4 (but not POSIX.1).

SEE ALSO
       gprof(1), setitimer(2), signal(2), sigaction(2)



Linux 2.0                         1993-07-23                         PROFIL(3)