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a theoretical advantage I see for SLS is that it enables the
programmer to store data on disk in the same data structures as used
in a running program. Programs work with arrays, lists and other
collections of data. Then when the data is to be stored to permanent
disk, the data is written to a stream file using variations of the
Unix File write statement. Two different sets of instructions to work
with the same data.

With SLS, the data structures your program is working with could be
located in a user space. Or the data struct can be copied, as is, from
program memory to the user space.No need to use the Unix File APIs to
store and access the data in a stream file. Effectively, you could
memcpy from disk into memory. Or resolve a space pointer to the data
structure in the user space and not have to copy into memory.

granted, normally you want to serialize stream file data as lines of
text for the purpose of universal access. But that is a decision based
on your application requirements, not the computer architecture.

-Steve


On Tue, Aug 18, 2009 at 9:51 AM, Hans Boldt<hans@xxxxxxxxxx> wrote:

My point is simply that, strictly speaking, the same could be said about
conventional O/S architectures. It's the job of the (modern) O/S to shield
these details from the application programmer. (Then again, maybe we're
just arguing semantic nuances here.)

theoretically, with SLS, the storage of a running job ( static,
automatic and activation groups ) could be allocated from permanent
storage.





Cheers! Hans


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