Name
profil — execution time profile
Synopsis
#include <unistd.h>
int
profil( |
unsigned short * | buf, |
| size_t | bufsiz, | |
| size_t | offset, | |
| unsigned int | scale); |
![[Note]](../stylesheet/note.png) |
Note | ||
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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.
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.
COLOPHON
This page is part of release 2.79 of the Linux man-pages project. A
description of the project, and information about reporting
bugs, can be found at
http://www.kernel.org/doc/man-pages/.
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Copyright 1993 Rickard E. Faith (faithcs.unc.edu) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. Modified Fri Jun 23 01:35:19 1995 Andries Brouwer <aebcwi.nl> (prompted by Bas V. de Bakker <basphys.uva.nl>) Corrected (and moved to man3), 980612, aeb |