[TriLUG] Dual core question

[Charles Fischer]

I would like to get a CPU core count from a Linux box.  Does anybody have a 
dual core box running a 2.6 kernel?  If so would you run the following 
short program and let me know what it output?  I would also like to know 
which version of Linux you are running and how many CPU sockets are filled 
and the CPU model numbers.  The program compiles with the following command 
line:

   cc cpu_core_check.c

and runs with the following:

   ./a.out

I am assuming that you copy the program from this e-mail and call it 
cpu_core_check.c.

If somebody knows a better way to get a CPU and core count please let me know.

Thanks
Charles Fischer

#include <stdlib.h>
#include <stdio.h>
#include <sched.h>
int main(int argc, char *argv[])
{
	unsigned int				len;
	unsigned long				mask;
	int					error;
	int					count = 0;
	len = sizeof(unsigned long);
	error = sched_getaffinity(0, len, &mask);
	if (error != 0)
	{
		fprintf(stderr, "Error from sched_getaffinity.\n");
		exit(-1);
	}
	while ((1 << count) & mask != 0) count++;
	printf("CPU count: %d\n", count);
	return(0);
}