I am not sure. I dont know enough about the memory mapping APIs in IBM
i, Unix and Windows. It does raise a larger question in my mind, which
is, if all operating systems can map memory to stream files, what is
special about SLS?


On Thu, Aug 13, 2009 at 9:02 PM, Mark S.
Waterbury<mark.s.waterbury@xxxxxxx> wrote:
Hi, Steve:

We already have the ability in OS/400 to use the UNIX mmap() API to map
any streamfile into teraspace. You can use mmap64()  to map files larger
than 4GB into teraspace. This has been available almost since Teraspace
was first introduced (around V4R4).

Using this approach, you can directly address the contents of
streamfiles via pointers.  Is this not what you are asking for? :-o

Mark S. Waterbury

 > Steve Richter wrote:
when explaining SLS to those on another platform, keep in mind r that
you have to be prepared to make the case of how SLS is better than a
traditional system. In SLS you have the same way of addressing bytes
in a permanent user space as in program allocated memory. However,
there is the 16 meg segment size limit which complicates the work of
coding for spaces. We have teraspace, but teraspace can only be used
only for progam allocated memory.

Consider the improvements which could be made to SLS.  Without the
segment limit, stream files could be addressed as an array of bytes.
No need for teraspace, since objects on the system could be the size
of all the dasd on the system. Program memory could be allocated from
permanent user space like objects, making it possible for the system
to store the complete program memory state of an abended job.

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