profil - execution time profile
#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)
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.
Zero is always returned.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
profil() | Thread safety | MT-Unsafe |
Similar to a call in SVr4 (but not POSIX.1).
This page is part of release 5.10 of the Linux man-pages
project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.