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Re: C++ compilers on Linux supporting 64bit architecture?

On Sun, 2 Sep 2007 05:28:45 +0000 (UTC), Kevin Kofler
<kevin kofler chello at> wrote:

>Jonathan Dieter <jdieter <at> gmail.com> writes:
>> Have you looked at qemu at all?  Check out:
>> http://www.h7.dion.ne.jp/~qemu-win/
>> It should be able to run a 64-bit virtual system under Windows... and
>> it's completely free (in all ways).
>Yes, QEMU can run x86_64 VMs on a 32-bit host. That's how the x86_64 RPMs at 
>http://repo.calcforge.org/fedora/ are built. (I use a 32-bit Fedora as the host 
>though, not Window$.) However, this isn't anywhere near fast, it's about 50 
>times slower than the native hardware! Running 32-bit on 32-bit or 64-bit on 
>64-bit can be accelerated with kqemu, but running 64-bit on 32-bit is only 
>possible in software, which is really slow.

With VirtualPC2007 on Windows the CPU is not emulated, it is
virtualized, so the real host hardware is actually used concerning RAM
and CPU. All other hardware is emulated. But this makes VPC2007 very
fast, you barely notice that you are running in a virtual machine.

Of course it also means that the CPU is given, if you have a 32 bit
CPU, that's all you are ever going to be using in a virtual machine as

Bo Berglund

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