From owner-freebsd-questions@FreeBSD.ORG  Wed Jun 16 08:59:59 2004
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 6075816A4CF
	for <questions@freebsd.org>; Wed, 16 Jun 2004 08:59:59 +0000 (GMT)
Received: from turing.cs.hmc.edu (turing.cs.hmc.edu [134.173.42.99])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 53ACC43D2F
	for <questions@freebsd.org>; Wed, 16 Jun 2004 08:59:59 +0000 (GMT)
	(envelope-from jmason@cs.hmc.edu)
Received: by turing.cs.hmc.edu (Postfix, from userid 34126)
	id 1FFA453B18; Wed, 16 Jun 2004 01:58:57 -0700 (PDT)
Date: Wed, 16 Jun 2004 01:58:56 -0700
From: "Julian M. Mason" <jmason@cs.hmc.edu>
To: Dan Nelson <dnelson@allantgroup.com>
Message-ID: <20040616085856.GA26476@turing.cs.hmc.edu>
References: <40CFB701.9000303@yahoo.fr>
	<20040616043201.GN62945@dan.emsphone.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20040616043201.GN62945@dan.emsphone.com>
User-Agent: Mutt/1.4.2.1i
cc: questions@freebsd.org
cc: CAVELIER Gr??gory <g_cavelier@yahoo.fr>
Subject: Re: CPU frequency
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: jmason@cs.hmc.edu
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>,
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Wed, 16 Jun 2004 08:59:59 -0000

My 5.2.1-RELEASE install offers a 'mount_linprocfs' command; running 
# mount_linprocfs none /proc
gives me a very linux-esque /proc filesystem, including /proc/cpuinfo,
which includes CPU frequency.

    --Mac

On Tue, Jun 15, 2004 at 11:32:01PM -0500, Dan Nelson wrote:
> 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
> _______________________________________________
> freebsd-questions@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-questions
> To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
> 

-- 
Julian "Mac" Mason                          jmason@cs.hmc.edu
Computer Science '06                           (909)-607-3129
Harvey Mudd College