Manpage of PROFIL

PROFIL

Section: Linux Programmer's Manual (3)
Updated: 2016-03-15
Index
 

NAME

profil - execution time profile  

SYNOPSIS

#include <unistd.h>int profil(unsigned short *buf, size_t bufsiz,           size_t offset, unsigned int scale);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

profil():

    Since glibc 2.21:
        _DEFAULT_SOURCE
    In glibc 2.19 and 2.20:
        _DEFAULT_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
    Up to and including glibc 2.19:
        _BSD_SOURCE || (_XOPEN_SOURCE && _XOPEN_SOURCE < 500)
 

DESCRIPTION

This routine provides a means to find out in what areas your program spends most of its time. The argument bufpoints to bufsizbytes of core. Every virtual 10 milliseconds, the user's program counter (PC) is examined: offsetis subtracted and the result is multiplied by scaleand divided by 65536. If the resulting value is less than bufsiz, then the corresponding entry in bufis incremented. If bufis NULL, profiling is disabled.  

RETURN VALUE

Zero is always returned.  

ATTRIBUTES

For an explanation of the terms used in this section, see attributes(7).
InterfaceAttributeValue
profil() Thread safetyMT-Unsafe

 

CONFORMING TO

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

BUGS

profil() cannot be used on a program that also uses ITIMER_PROFinterval timers (see setitimer(2)).

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

SEE ALSO

gprof(1), sprof(1), setitimer(2), sigaction(2), signal(2)


 

Index

NAME
SYNOPSIS
DESCRIPTION
RETURN VALUE
ATTRIBUTES
CONFORMING TO
BUGS
SEE ALSO

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