Date: Sat, 27 Feb 1999 17:02:12 -0500 (EST) From: Chuck Robey <chuckr@mat.net> To: Mark Turpin <mturpin@saturn.spel.com> Cc: smp@FreeBSD.ORG Subject: Re: Determining the number of processors? Message-ID: <Pine.BSF.4.05.9902271637570.68172-100000@picnic.mat.net> In-Reply-To: <Pine.BSF.4.05.9902271625180.61883-100000@saturn.spel.com>
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On Sat, 27 Feb 1999, Mark Turpin wrote:
>
> Is there any way, in a program, to find out how many processors
> a machine has?
picnic:/usr2/chuckr:119 >sysctl machdep.smp_cpus
machdep.smp_cpus: 2
There is also sysctl(3) for doing it in C ... not really complicated,
#include <stdio.h>
#include <sys/types.h>
#include <sys/sysctl.h>
int main()
{
int numcpus = 0;
int buflen = 4;
int mib[2];
int err_ret = 0;
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if((err_ret = sysctl(mib, 2, &numcpus, &buflen, NULL, 0)) != 0 )
{
perror("Error doing sysctl: ");
exit(0);
}
else printf("sysctl returned %d.\n",numcpus);
exit(0);
}
----------------------------+-----------------------------------------------
Chuck Robey | Interests include any kind of voice or data
chuckr@glue.umd.edu | communications topic, C programming, and Unix.
213 Lakeside Drive Apt T-1 |
Greenbelt, MD 20770 | I run picnic (FreeBSD-current)
(301) 220-2114 | and jaunt (Solaris7).
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