>>>>> "willy" == willy <willy@thepuffingroup.com> writes:
> On Sun, Mar 05, 2000 at 01:46:09PM +0100, David Weinehall wrote:
>> - Crays (the non-vector models; I suspect that Linux doesn't
>> would be very suitable on a vector-machine. But I could
>> be wrong)
> i heard they don't have an MMU. ucLinux on a Cray, baby! I've heard
> people talking about merging ucLinux into 2.5, but they're crazy people.
They most definitely do have an MMU. The vector models usually (always?)
used process-swapping rather than demand-paging: no page faults (because
exceptions weren't precise). I don't know if the non-vector models allowed
paging or not.
>>>>> "Alan" == Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> The AS/400 is more like a toaster than a computer. They take an interesting
> approach of implementing a protected machine via software 'trust'. The
> compiler generates apps that are written in an interpreted layer and have
> been validated to some extent. The code is then executed JIT style with
> trust checks in the code. The real hardware is much akin to an MMUless 386.
AS/400 has been using PowerPC derivatives (PowerAS :-) processors for
a fairly long time now. Is it really MMUless ? I know they use a single
address space, but an MMU can still be useful for many other things.
Stefan
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