PROFIL (2)
execution time profile
SYNOPSIS
#include <unistd.h>
int profil(char * buf , int bufsiz , int offset , int scale );
DESCRIPTION
Under Linux 0.99.11,
profil
is not implemented in the kernel. Instead, the DLL 4.4.1 libraries provide
a user-space implementation.
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 .
If this address is in
buf ,
then the word pointed to is incremented.
If
scale
is less than 2 or
bufsiz
is zero, profiling is disabled.
RETURN VALUE
BUGS
profil
cannot be used on a program that also uses
ITIMER_PROF
itimers.
Calling
profil
with an invalid
buf
will result in a core dump.
True kernel profiling provides more accurate results.
SEE ALSO
|
|
