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PROFIL
!!!PROFIL
NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
BUGS
CONFORMING TO
SEE ALSO
----
!!NAME


profil - execution time profile
!!SYNOPSIS


__#include __


__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, profiling
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 contained 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)
----

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Last edited on Tuesday, June 4, 2002 12:24:30 am by "perry"

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