IA-32 on x86-64

[John Richard Moser <nigelenki@comcast.net>]

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Does anyone know how to check if I'm running an IA-32 process on x86-64?
 More importantly, how do I tell how big the user VM space is for
current?  Like 3GiB for x86 and who knows what (87GiB?  192GiB?) for
x86-64 and however much for sparc/ppc ....

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