Other Alias
get_nprocsSYNOPSIS
#include <sys/sysinfo.h>
int get_nprocs(void);
int get_nprocs_conf(void);
DESCRIPTION
The function get_nprocs_conf() returns the number of processors configured by the operating system.The function get_nprocs() returns the number of processors currently available in the system. This may be less than the number returned by get_nprocs_conf() because processors may be offline (e.g., on hotpluggable systems).
RETURN VALUE
As given in DESCRIPTION.ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).Interface | Attribute | Value |
get_nprocs(),
get_nprocs_conf() | Thread safety | MT-Safe |
CONFORMING TO
These functions are GNU extensions.NOTES
The current implementation of these functions is rather expensive, since they open and parse files in the /sys filesystem each time they are called.The following sysconf(3) calls make use of the functions documented on this page to return the same information.
np = sysconf(_SC_NPROCESSORS_CONF); /* processors configured */ np = sysconf(_SC_NPROCESSORS_ONLN); /* processors available */
EXAMPLE
The following example shows how get_nprocs() and get_nprocs_conf() can be used.
#include <stdlib.h> #include <stdio.h> #include <sys/sysinfo.h> int main(int argc, char *argv[]) { printf("This system has %d processors configured and " "%d processors available.\n", get_nprocs_conf(), get_nprocs()); exit(EXIT_SUCCESS); }
COLOPHON
This page is part of release 4.06 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/.