profil - execution time profile
int profil(unsigned short *buf, size_t bufsiz,
size_t offset, unsigned int scale);
Since glibc 2.21:
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).
Similar to a call in SVr4 (but not POSIX.1).
profil() cannot be used on a program that also uses ITIMER_PROF
interval timers (see setitimer(2)).
True kernel profiling provides more accurate results.
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/.