Date: Thu, 9 Jun 2016 11:47:29 -0400 From: Justin Hibbits <chmeeedalf@gmail.com> To: Jason Bacon <bacon4000@gmail.com> Cc: "freebsd-ppc@freebsd.org" <freebsd-ppc@freebsd.org> Subject: Re: Detecting Power7 in C Message-ID: <3FD85BCC-4304-4DBA-8B72-5A6A79C120A6@gmail.com> In-Reply-To: <765d3292-78ae-8b02-8a5b-43bafc68d9e8@gmail.com> References: <765d3292-78ae-8b02-8a5b-43bafc68d9e8@gmail.com>
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On Jun 9, 2016, at 9:09 AM, Jason Bacon wrote:
>
> I'm porting the SLURM task/affinity plugin to FreeBSD and wondering
> what's the best way to detect whether we're running on a power7
> processor.
>
> The Linux code is below. I could do something similar with
> dmesg.boot on FreeBSD, but hoping there's a more elegant way within
> a C program.
>
> If I have to use dmesg.boot, what string would I be looking for? I
> don't have a power7 installation at the moment.
>
> Thanks,
>
> Jason
>
> FILE *cpu_info_file;
>
> char buffer[128];
> char* _cpuinfo_path = "/proc/cpuinfo";
> cpu_info_file = fopen(_cpuinfo_path, "r");
> if (cpu_info_file == NULL) {
> error("_get_is_power: error %d opening %s",
> errno,
> _cpuinfo_path);
> return false; /* assume not power processor
> */
> }
>
> is_power = 0;
> while (fgets(buffer, sizeof(buffer), cpu_info_file) !
> = NULL) {
> if (strstr(buffer, "POWER7")) {
> is_power = 1;
> break;
> }
> }
> fclose(cpu_info_file);
You can use the hw.model sysctl. For POWER7, the string you would
receive is "POWER7". For all the model strings you can get, see the
strings in the models[] table in sys/powerpc/powerpc/cpu.c .
- Justin
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