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Hi, I need to know if there is any difference in performance between (i) a 32bit application running on a 64 bit Redhat AS 5.0, and (ii) a 64 bit ...
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  1. #1
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    Performance/overhead: 32 bit application on 64 bit Redhat AS 5.0


    Hi,

    I need to know if there is any difference in performance between (i) a 32bit application running on a 64 bit Redhat AS 5.0, and (ii) a 64 bit application running on 64 bit Redhat AS 5.0. Will there be any extra overhead in any of the two cases?

    I am new to this..
    Can someone please help.


    Thanks
    Ananya

  2. #2
    Linux Guru smolloy's Avatar
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    The only performance hit will be that you won't be able to access the huge memory that 64 bit offers -- although 32 bit memory access is easily enough for almost all applications out there.

    Other than that -- no, I don't think there will be any performance hits.
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  3. #3
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    Thanks for the prompt response.

    So do you know if the 64 bit Redhat (AS v 5.0) converts the 32 bit instructions to 64 bit instruction, before running the 32 bit application on it?

    If it does, then I would guess that may have some overhead right?

    Thanks,
    Ananya

  4. #4
    Linux Guru coopstah13's Avatar
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    the 64 bit proc is mostly for the extra memory registers that are available, you shouldn't experience any noticeable performance hit executing 32 bit apps on a 64 bit OS, I currently run 64 bit version of ubuntu and run 32 bit windows applications on it and they run the same as they did on my 32 bit installation of debian

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