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MEMSIZE.TEC
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1990-08-16
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ID:MS Explanation of Memory Size Field
Quarterdeck Technical Note.
By Joe Wilder
The Memory Size (in K) option is a number set to allow DESQview the
opportunity to tell the user whether there is enough memory to open a
particular program. That is to say, DESQview compares the number in the
Memory Size (in K) field to the Largest Available fields (conventional and
expanded) in Memory Status (which varies according to which and how many
programs are running). If Mem Size in K is larger than BOTH conventional
and expanded Largest Available, DESQview puts a message on the screen telling
the user there is not enough memory to open that window. At this point DV
hasn't even tried to open the program. It's just telling the user there's
not enough memory according to the user's specification to try to run the
program. This is useful to prevent a program from attempting to run and then
freeze for lack of available memory. Note: Programs running under Desqview
require approximately 9K extra memory for DV overhead.
The Maximum Program Memory Size (in K) is the amount of memory which DV will
try to acquire for the particular program. If this number is higher than the
Largest Available fields in memory status (both conventional and expanded) DV
will acquire every last byte that is available in the partition it chooses to
use whether the program needs that much memory or not. If there is ample
memory on the computer you might want to set Max Prog Mem Size to some very
high number that you know is beyond what is actually available - possibly for
purposes of testing. This of course may not be desirable for people with
machines with limited memory that are trying to multitask a couple of small
programs. They may want to try to squeeze multiple small programs into the
first partition which would be completely used up if the first program's
Maximum Program Memory Size (in K) was set higher than necessary.
Maximum Expanded Memory Size (in K) is used to limit a program by the
amount of expanded memory it may use. If Maximum Expanded Memory Size is
left blank, a program may take or leave as much expanded memory as it wants.
If a number is put in this field, the program may take as much memory as it
wants up to that number. If a program doesn't use all the Expanded memory
allocated by this field, the rest is still available for other uses. This is
especially useful for running programs that grab all of the expanded
memory available, leaving nothing for other uses. This convention is
not to be confused with the usage of a blank with the Maximum Program
Memory Size (in K). In the case of Max Prog Mem Size a blank means this
field will default to the number in Program Memory Size (in K).
Copyright (C) 1990 by Quarterdeck Office Systems
* * * E N D O F F I L E * * *