64 bit OS / 32 bit process

Question

What is the maximum private memory that a 32 bit process can address on a 64 bit operating system?

score 3 · Accepted Answer · edited May 23 '17 at 12:30

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The limit is 2GB. Please refer to this link for details

edited May 23 '17 at 12:30

Community

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answered Mar 01 '11 at 11:08

Neera

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Thanks - so it seems to me that the w3wp.exe for a 32 bit Asp.Net application should be able to address up to 4GB, since it is LARGEADDRESSAWARE – Matt Evans Mar 01 '11 at 13:59
The limits are marked differently for .Net - http://blogs.msdn.com/b/tom/archive/2008/04/10/chat-question-memory-limits-for-32-bit-and-64-bit-processes.aspx so in this case it will be restricted to 2GB – Neera Mar 01 '11 at 15:06
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Useful article. From my reading of it, I understood 2800 MB is the limit for a 32 bit .Net process in a 64 bit OS? – Matt Evans Mar 02 '11 at 05:41
Yes you are right its 2800 MB – Neera Mar 02 '11 at 05:58

Mat · Answer 2 · 2011-03-01T12:00:24.667

Generally: same as if it was running on a 32bit OS. It's internal pointers are still 32bit, so only 4G addressable. Same limitations apply with kernel reserved address space, which will depend on the exact OS and its configuration (~~usually the process will have a total of 2 or 3G to play with~~).

Edit: the above is actually not correct. It appears to be a 2G / 4G option for win64, see the link posted by Neera.

64 bit OS / 32 bit process

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