RE: Space pointers

Based on a test, ALCHSS allocates 16 bytes + your allocation size.  So 16
user bytes is 32 actual, 32 user bytes is 48 actual.

Not sure if the 16 bytes of the system is before or after the allocation.
Also not sure what it is used for.

Steve Richter

-----Original Message-----
From: mi400-admin@midrange.com [mailto:mi400-admin@midrange.com]On
Behalf Of Leif Svalgaard
Sent: Monday, April 08, 2002 6:58 PM
To: mi400@midrange.com
Subject: Re: [MI400] Space pointers


From: John Taylor <jtaylor@rpg2java.com>
> > I would be careful when looking at the allocated size using MI.  I'm not
> > sure if MI will report the actual number of bytes used, or the allocated
> > memory.  I'm not real familiar with what goes on behind the scenes in
the
> > AS/400.
>
> Yes, that's a good point. The MI template isn't clear regarding whether
the
> allocation size reported is referring to the minimum allocation requested,
> or the actual storage units used. (I'm guessing that by "bytes used", you
> weren't referring to the length of data.)
>
> Steve, Leif, can either of you shed some light on this?
>

when you create an allocation the minimum size is 512 bytes
(one standard storage block). I would assume that the size
at all time would be a multiple of 512 bytes. The page size
of a RISC AS/400 is 4096 bytes, but since MI is the same
for both CISC and RISC boxes, I think that 512 bytes is the
real allocation unit.



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