Single Process Memory Limits

[David Mackintosh]

Hello,

I'm trying to find a definitive answer to this question:

What is the maximum amount of total userspace memory that a single
process can allocate?

Here's what I think I've learned:

 - with standard kernels, the limit is about 2GB.
 - with 'bigmem' kernels, the limit is about 3GB.  This is actually 4GB,
   but 1GB is reserved by the kernel for stack etc.

For the sake of standardization, let's say that the kernels in
question are the standard uniprocessor kernel and bigmem kernels
which shipped with stock RedHat 8.0.

Anyone know where I can find a reasonably straight-forward answer to
this question?  

Thanks.

-- 
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