Re: Antwort: Re: RPGIV - Pointer Parameter API QwpzHostPrintTransform

[Jim Langston <jlangston@xxxxxxxxxxxxxxxx>]

I don't know the design architecture of the AS/400 that well, but just 
memory management in general.

The AS/400 needs to keep track of what program has what memory, and does
this by a number of schemes, the most common being a section of memory
that has a table of who has what memory, a pointer into this memory, and
the size of the allocated memory.

Also, alloced memory must be contiguous, that is, one block of memory, not
different sections of memory, so physical memory plays a role.

Paging also has an effect, how big is the page size the AS/400 uses for 
dynamic memory.

So the limits come in from how big a chunk of memory the AS/400 can grab
at one time, how big of a number can the AS/400 store in the allocation
tables, and how the AS/400 uses pages.

So how much memory Alloc will allocate is the lowest value of these different
things that play a part.

Most likely, it is the page size that is the limiting factor on the AS/400,
though I'm not certain of that.

Regards,

Jim Langston

Scott Klement wrote:
> 
> On Thu, 15 Mar 2001, Patrick Conner wrote:
> 
> > Can I define the based on pointer character field as 1A? And
> > why is 16M the limit?
> >
> 
> Sure...  you can define it as 1A, then move the pointer forward to
> access more memory.   Depending on what you're doing, this may not
> perform very well, but it should work.
> 
> I don't know why there's a limit on ALLOC.  (I got that number from
> the V4R4 ILE RPG/400 Reference manual)
> 
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