32 bit application memory limit \ VOGONS

32 bit application memory limit

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First post, by ratfink

Posted on 2013-09-10, 16:15

ratfink Offline

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I have a 32 bit application in mind for my work, which would be run under 64 bit windows.

Aside of limitations deliberately built into the software itself, is it going to be limited to the max memory that 32 bit addressing can see [3.5gb or whatever] or would 64bit memory limitations apply? I have datasets that could come to 12gb, and the application is designed to run with them loaded into memory.

Anyone know?

Reply 1 of 3, by gerwin

Posted on 2013-09-10, 16:33

gerwin Offline

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2GB normally.
But there seems to be a /LARGEADDRESSAWARE trick too.

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Reply 2 of 3, by ratfink

Posted on 2013-09-10, 17:46

ratfink Offline

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Ok thanks, that was enough to get me started. From what I can see, a 32 bit application would be limited to a maximum of 4gb even when run on a 64 bit version of windows with plenty of memory.

Reply 3 of 3, by gerwin

Posted on 2013-09-10, 18:07

gerwin Offline

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I see differing info on the net. Microsoft says this about it:
http://support.microsoft.com/default.aspx?scid=889654

1General memory limits           32-bit OS               64-bit OS
2-------------------------------------------------------------------------------------
3Total virtual address space     4 gigabytes (GB)        16 terabytes
4
5Virtual address space per       2 GB, 3 GB if the       2 GB, 4 GB if the application
632-bit process                  system is booted        is compiled with the  
7                                with the /3GB switch    /LARGEADDRESSAWARE switch
8
9Virtual address space per       Not applicable          8 terabytes
1064-bit process

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