On 7/31/2012 9:27 AM, Paul Gilmartin wrote:
Storage protection in other OSes:
On Mon, 30 Jul 2012 22:09:07 -0600, Steve Comstock wrote:
Sigh. I keep forgetting (wishful thinking?) what a primitive OS z/OS is;
that it provides no simple way a program can protect its storage from
meddling by others. z/OS still thinks it's running on a s/360.
I never saw an answer from you regarding my question for some examples
of how other non-primitive OS's provide a "simple way a program can
protect its storage from meddling by others"
We're both familiar with UNIX, which classically runs each process in
a separate address space. How much simpler or more effective
could it be? Likewise z/VM.
Yes, well, each batch job runs in a separate address space, too.
Isn't that the same approach?
Of course the advanced user can meddle with other address space
storage using authorized services, but that's true for z/OS UNIX,
too. Every OS has facilities for the authorized user to do anything
they want / need.
But for basic applications (batch and TSO, most CICS and IMS), the
application programmer has his/her storage protected from meddling by
other applications automatically by address space isolation.
Guess I'm just not sure what flaw you're seeing in z/OS here,
compared to other operating systems.
z/OS UNIX (USS) has compromised that classic UNIX model for reasons
of performance, running multiple processes in shared address spaces.
But I suspect (with no evidence whatever) that Linux for z can run
a number of processes in private address spaces with better performance
than USS can run the same processes in shared address spaces.
-- gil
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-Steve Comstock
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