Date: Tue, 15 Jun 2004 23:32:01 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: CAVELIER =?utf-8?Q?Gr=C3=A9gory?= <g_cavelier@yahoo.fr> Cc: questions@freebsd.org Subject: Re: CPU frequency Message-ID: <20040616043201.GN62945@dan.emsphone.com> In-Reply-To: <40CFB701.9000303@yahoo.fr> References: <40CFB701.9000303@yahoo.fr>
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In the last episode (Jun 16), CAVELIER Grgory said:
> How can I get the CPU frequency from a C program ???
> Under Linux, I used the /proc filesystem but how can I do this with
> FreeBSD (I have version 5.2.1)
Try
#include <stdio.h>
#include <stdlib.h>
#include <sys/sysctl.h>
#include <sys/types.h>
int main(void)
{
long mhz;
size_t mhzsize = sizeof(mhz);
if (sysctlbyname("hw.clockrate", &mhz, &mhzsize, NULL, 0))
{
perror("cannot get MHz");
return 1;
}
printf("%ld\n", mhz);
return 0;
}
You could also use machdep.tsc_freq to get the exact clock rate in Hz.
--
Dan Nelson
dnelson@allantgroup.com
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