Making use of 64 bit/multi core processers?

This is a discussion on Making use of 64 bit/multi core processers? within the C++ Programming forums, part of the General Programming Boards category; Resent processers seem to mostly all have 64 bit support. Some also have more than one processer in one packege. ...

  1. #1
    Registered User code2d's Avatar
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    Question Making use of 64 bit/multi core processers?

    Resent processers seem to mostly all have 64 bit support. Some also have more than one processer in one packege. Core 2 duo processers for example. There is even a core 2 duo with four processors in one.
    I am wondering does windows spread resources over multiple core and use "64 bit" when it is available or do you use c++ to make for efficient use of these technologies.

    Any help is appreciated.

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    It's up to the compiler. I'm not running 64 bits yet, but there should be an option in Visual Studio to compile for the 64-bit Windows OS.

    I am wondering does windows spread resources over multiple core.
    To some extent, yes, the operating system takes care of it. Windows will automatically split the various running processes/programs between the available processors. If you write a program that hogs the processor in a "tight loop", it will only hog a single processor/core and the other processors will be available for other tasks. (In fact, Windows won't allow a user-mode program to totally hog the processor.)

    If you want your program to take advantage of multiple processors, you need to write a multi-threaded program. Then Windows can divide the threads among the available processors. It's actually rather difficult to "balance" the threads in order to run multiple cores at 100%.

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    CSharpener vart's Avatar
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    I am wondering does windows spread resources over multiple core
    Win9x/ME support 1 processor
    WinXp Pro - 2
    Win 2003 Server
    The Web Edition supports a maximum of two processors and a maximum of two GB of RAM.
    The Standard Edition supports a maximum of four processors and four GB or RAM
    Enterprise Edition will support up to eight multiprocessors and up to 32 GB of RAM. A 64-bit version is also available, but it requires 64-bit processors.
    Datacenter Editionsupports up to 64 multiprocessors and 512 GB of RAM and is also available in a 64-bit version.

    Each windows version has specifications of the supported hardware
    The first 90% of a project takes 90% of the time,
    the last 10% takes the other 90% of the time.

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    Registered User code2d's Avatar
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    I found a article and some books on multithreading.
    . It's actually rather difficult to "balance" the threads in order to run multiple cores at 100%
    As I read, what you are saying comes more true after every sentence.

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    Cat without Hat CornedBee's Avatar
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    You can only really make use of 64-bit CPUs if you write a program that actually can do something useful with more than 2 GB RAM. Otherwise it's just so much wasted space for bigger pointers, and the additional registers that the x64 architecture happens to provide. (Nothing to do with 64-bit, though. Just that they're only available in 64-bit mode.)
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