Re: [RFC] lscpu - CPU architecture information helper

[Karel Zak <kzak@xxxxxxxxxx>]

 Hi Cai,

 I have a few (minor) notes:

On Fri, Jul 04, 2008 at 11:23:10AM +0800, Cai Qian wrote:
> I propose a new tool lscpu to util-linux-ng, This program gathers CPU

 don't forget that a man page is required for all new tools.

>  _______________________________________________________________
> |      |       |            |     |     |      |       |        |
> | cpu0 |       |            |     |     |      |       |        |
> |______| core0 |            | L1d | L1i | L2d  |       |        |
> |      |       |            | 16K | 16K | 256K |       |        |
> | cpu1 |       |            |     |     |      |       |        |
> |______|_______| processor0 |_____|_____|______| L2i   | L3     |
> |      |       |            |     |     |      | 1024K | 12288K |
> | cpu2 |       |            |     |     |      |       |        |
> |______| core1 |            | L1d | L1i | L2d  |       |        |
> |      |       |            | 16K | 16K | 256K |       |        |
> | cpu3 |       |            |     |     |      |       |        |
> |______|_______|____________|_____|_____|______|_______|________|
> |      |       |            |     |     |      |       |        |
> | cpu4 |       |            |     |     |      |       |        |
> |______| core2 |            | L1d | L1i | L2d  |       |        |
> |      |       |            | 16K | 16K | 256K |       |        |
> | cpu5 |       |            |     |     |      |       |        |
> |______|_______| processor1 |_____|_____|______| L2i   | L3     |                    
> |      |       |            |     |     |      | 1024K | 12288K |
> | cpu6 |       |            |     |     |      |       |        |
> |______| core3 |            | L1d | L1i | L2d  |       |        |
> |      |       |            | 16K | 16K | 256K |       |        |
> | cpu7 |       |            |     |     |      |       |        |
> |______|_______|____________|_____|_____|______|_______|________|


 That's really nice ASCII art. People love pictures :-)

> usage()
> {
>     cat <<EOF
> Usage: $0 [OPTION]
> CPU architecture information helper
> 
>   -p, --parse      print out in parsable instead of printable format.
>   -h, --help       usage information
> EOF
> }

 Please, read:
 http://www.gnu.org/software/autoconf/manual/gettext/Preparing-Shell-Scripts.html

> arch=$(uname -m)
> # Only i686, X86_64 and IA64 are supported at the moment.

 Do you plan to add any other architectures?

> # Dom0 Kernel gives wrong information.
> if grep "control_d" "/proc/xen/capabilities" >/dev/null 2>&1; then
>     echo "Error: Dom0 Kernel is not supported." >&2
>     exit 1
> fi

 BTW, virsh(8) (command "virtsh nodeinfo") from libvirt provides basic
 information about virtual HW.

> # Read through sysfs.
> syspath="/sys/devices/system"

 maybe you also want to define:

     cpu0path="${syspath}/cpu/cpu0"

> # Read through cpuinfo.
> vendor=$(grep -m 1 "vendor" /proc/cpuinfo | sed 's/.*: \(.*\)/\1/')
> family=$(grep -m 1 "family" /proc/cpuinfo | sed 's/.*: \(.*\)/\1/')
> model=$(grep -m 1 "model.[^n]" /proc/cpuinfo | sed 's/.*: \(.*\)/\1/')
> stepping=$(grep -m 1 "stepping" /proc/cpuinfo | sed 's/.*: \(.*\)/\1/')
> mhz=$(grep -m 1 "cpu MHz" /proc/cpuinfo | sed 's/.*: \(.*\)/\1/')

 Awk lover's note:

 export $(gawk '
    BEGIN {FS=": "}
    /^model.[^n]/ {v=$2}
    /^cpu family/ {f=$2}
    /^model.[^n]/ {m=$2}
    /^stepping/   {s=$2}
    /^cpu MHz/    {h=$2}
    { if (v && f && m && s && h) nextfile }
    END {
        printf "vendor=" v;
        printf "family=" f;
        printf "model=" m;
        printf "stepping=" s;
        printf "mhz=" h;
    }' /proc/cpuinfo)

>         level=$(cat "${syspath}/cpu/cpu0/cache/${i}/level")
>         type=$(cat "${syspath}/cpu/cpu0/cache/${i}/type")

    type=$(<"${syspath}/cpu/cpu0/cache/${i}/type")


    Karel

-- 
 Karel Zak  <kzak@xxxxxxxxxx>
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