Date: Wed, 16 Jun 2004 01:58:56 -0700 From: "Julian M. Mason" <jmason@cs.hmc.edu> To: Dan Nelson <dnelson@allantgroup.com> Cc: CAVELIER Gr??gory <g_cavelier@yahoo.fr> Subject: Re: CPU frequency Message-ID: <20040616085856.GA26476@turing.cs.hmc.edu> In-Reply-To: <20040616043201.GN62945@dan.emsphone.com> References: <40CFB701.9000303@yahoo.fr> <20040616043201.GN62945@dan.emsphone.com>
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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
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--
Julian "Mac" Mason jmason@cs.hmc.edu
Computer Science '06 (909)-607-3129
Harvey Mudd College
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