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Asked: 2026-05-25T19:20:05+00:00

I want to keep some applications to run with a 4 GB address space

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I want to keep some applications to run with a 4 GB address space within a 64 bit OS running on a 64 bit processor (x86 xeon, 8 core). I know there is an option to compile with -m32 option, but at this moment the computer I’m working with, doesn’t have the required support for compiling with -m32, so I can’t use it, neither I can install anything on that computer as I don’t have any rights.

Now my question is if there is any possibility to restrict address space to 4 GB. Please don’t ask me why I want to do so, just tell me how if that is possible. Thanks.

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1 Answer

  1. Editorial Team

    The ulimit/setrlimit mechanism, accessible in bash via ulimit, can do this with minor drawbacks. 

    ulimit -v 4000000

    should limit the memory available to the current process group to 4 GB.

    However, it limits the total size of your address space mappings, and does not limit your mappings’ offset
    – you still may have pointers larger than 2^32.

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