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I'd say you waste time taking a conscious decision between 64-bit and 32-bit, there are few good reasons to not just go with 64-bit, and dwelling on it just wastes time. Do you have any metrics to support your claim that 32-bit Debian is faster than the exact same 64-bit distro?

And what difference does virtual versus physical machines make? Heck, you can even run virtual 64-bit guests on a 32-bit host machine if the CPU supports either Intel-VT or AMD-V.

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I did find the results I got but without any further explanation they are not very useful: http://pastebin.com/WjiZNiSg

But interpreting those results indicates to me that there are possible problems with this platform where f.ex. file copy performance is ~50% faster on 32bit than 64bit.

To me just assuming that there is no difference and go with instinct without anything concrete evidence is the wrong way to go.

> And what difference does virtual versus physical machines make?

As the OP seems to have suggested, virtual machines don't have a lot of memory.

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