🚀 go-pugleaf

I am developing a very large OS/2 PM program that performs population
modelling.  In very simple terms, the program reads in observed census data,
the user specifies what processes to turn on/off, what outputs to view, and
how long of a projection to run (in years), and what interval should the
output occur.  The whole basis of the program is a spreadsheet.  It is, in
fact, a fully-functional spreadsheet capable of formulas, and really cool
graphs, etc.  So if the user runs a 10 year projection, she will get 10
new spreadsheets, each one being the population for that year.

So where the hell am I going with this?  I was doing some testing today with
very long projections, like 100 years, outputting a full set of outputs and
graphs for each year (population by sex/region, deaths by sex/region,
fertility by region, etc.).  In other words I was allocating very large
amounts of memory. For one of the projections I did, I requested over 1GB
of RAM, and OS/2 handled it great.  No apparent degredation in performance
at all.  Then I opened up another input file and ran another long projection
on top of the first, and some time into the second projection, a
WinCreateStdWindow() call failed.  WinGetLastError() returned 0x1012
which is PMERR_HEAP_MAX_SIZE_REACHED.  Exactly what does this error mean, and
how is it different from PMERR_HEAP_OUT_OF_MEMORY?  Does it mean that I 
have reached my limit for how many segments I can allocate?  Any advice on
how I should handle this?  

I appreciate any help that you can offer.  Thanks in advance,

-Carl Samos
 cjs33278@uxa.cso.uicu.edu
 Merriam Lab
 UIUC