CPU information

This is a discussion on CPU information within the C Programming forums, part of the General Programming Boards category; Hi everyone, I am trying to write a C program to collect some information about the cpu. Information needed includes ...

  1. #1
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    CPU information

    Hi everyone,
    I am trying to write a C program to collect some information about the cpu. Information needed includes memory performance, cpu performance, network performance, and file system information. Are there any libraries in C that would help me do that with as little kernel usage as possible?

    Thanks!

  2. #2
    and the hat of sweating
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    What OS?

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    Unix/Linux, sorry.

  4. #4
    Kernel hacker
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    Also, do you want to show what the ACTUAL values for this particular system is, or for example say that the memory "should be capable of X GB/s".

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

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    Not sure if this is what you need, but when my group and I were rewriting the command "top" this is what we used to see what processes are running/cpu they take/ram/etc.

    Code:
         #include <sys/types.h>
         #include <sys/sysctl.h>
    
         int
         sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
             size_t newlen);
    That will store alot of things you need in "void *oldp" which normally is a

    Code:
    struct kinfo_proc     *nameyouwant;

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    Quote Originally Posted by matsp View Post
    Also, do you want to show what the ACTUAL values for this particular system is, or for example say that the memory "should be capable of X GB/s".

    --
    Mats
    I would like to display actual values such as overall memory, and free memory for example.

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    Quote Originally Posted by +Azazel+ View Post
    Not sure if this is what you need, but when my group and I were rewriting the command "top" this is what we used to see what processes are running/cpu they take/ram/etc.

    Code:
         #include <sys/types.h>
         #include <sys/sysctl.h>
    
         int
         sysctl(int *name, u_int namelen, void *oldp, size_t *oldlenp, void *newp,
             size_t newlen);
    That will store alot of things you need in "void *oldp" which normally is a

    Code:
    struct kinfo_proc     *nameyouwant;
    The script that is being used now actually calls top. But the only information we need from top is the memory information so to grep just that one line out from all the stats top calls uses up too much cpu since this script is being run constantly when ran.

    EDIT:
    Oops, didn't see that you said you were rewriting top. I'll see if I can find anything about that command. Thanks.

  8. #8
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    Ah, ok, so you are not after benchmarking the system, but rather displaying the existing statistics of the system. I'm pretty sure there is a library (libstat?) that will help you do this by fishing it out of the relevant /sys and /proc pseudo-files.

    This was one of the first things when googling - it may not be the right thing for you, but I think it may lead you in the right direction.
    http://resourcemntrd.sourceforge.net/

    --
    Mats
    Compilers can produce warnings - make the compiler programmers happy: Use them!
    Please don't PM me for help - and no, I don't do help over instant messengers.

  9. #9
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    Thanks! I'll check it out.

  10. #10
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    On a side-note, you can find this information (available memory, used memory) in the file (or pseudo-files should we say) /proc/meminfo if you are running Linux.
    I hate real numbers.

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