Contents of the MEMSTAT.DOC file
MEMSTAT - OS/2 Presentation Manager Memory Status Utility, Version 2.01
Copyright (C) 1991, 1992 The Software Cottage. All rights reserved.
For further information, contact:
The Software Cottage
71 Bruce Street,
Mount Waverley, Vic, 3149
What is MemStat?
MemStat Version 2.01 is a utility program which displays the current
amount of available memory, the size of the swap file and the amount
of free space on the swap drive under OS/2 1.x and 2.x.
It has proven to be a useful tool, both in the test environment and
in the production environment.
To install MEMSTAT, place MEMSTAT.EXE in a directory in your path,
MEMSTAT.HLP in a directory pointed to by your HELP environment
variable, and use STARTUP.CMD to start it or make it an auto-start
application in one of your groups (or in the "Startup" folder under
OS/2 Version 2.0).
MEMSTAT commences operation once it is started and displays the memory
and swap file status, updated at one second intervals.
If MEMSTAT receives a WM_SAVEAPPLICATION message, e.g. after
selecting "Desktop->Save" under OS/2 1.3, it saves its current
position to OS2.INI. The next time it is started MEMSTAT will move
its display window to that position. This allows you to place MEMSTAT
in a position suited to your working environment.
Release Notes for Version 2.01
Enhancements in this release
- MemStat now displays the amount of disk space free on the swap drive.
- The MemStat display is now configurable through the Options pulldown
- MemStat now has on-line context-sensitive help.
Bug fixes in this release
- MemStat now displays the swap file size correctly when it is not on
- Fixed a problem with the way MemStat saved its position when
- MemStat needs to read CONFIG.SYS from the Boot Drive, so be careful
if you boot PM from a floppy disk and then run MemStat (It can be
done under 1.x!).
The MemStat Display
The MemStat Display window contains up to three lines of information
in this release. Depending on how you have set up MemStat, the
following information may be displayed:
This is the value returned from the DosMemAvail function call and
represents the size of the largest consecutive block of free memory
available when the function was called. Note that this is memory
available to 16-bit applications and may not be meaningful for 32-bit
applications running under OS/2 2.x.
Swap File Size
This is the physical size of the swap file, the location of which is
taken from the SWAPPATH parameter in CONFIG.SYS. Under OS/2 Version 1.x,
this parameter will start at 512K and gradually increase depending on the
memory requirements of the applications you run. Under OS/2 Version 2.x,
the swap file actually decreases in size as physical memory becomes
available so this value may go up and down as you work.
Swap Disk Free Space
This value is the amount of free space left on the drive containing
the swap file. If this value goes too low, it is an indication that
you may need to make more space on your swap drive or move your swap
file to another drive.
The following pulldown menus are available for selection from within
This menu allows the user to change the MemStat configuration, save
the position of MemStat on the desktop, and exit from MemStat. It contains
the following options:
This menu option brings up the MemStat Settings dialog box which
allows the user to alter the MemStat display. The user can tell
MemStat which parameters to display and can change the display
update interval to reduce the impact of MemStat on the system.
The settings selected by the user are saved in OS2.INI and retrieved
by MemStat when it is next loaded.
Selecting this option allows the user to save the current position of
MemStat on the screen. The next time MemStat is run, it will be
displayed in the saved position. This option is automatically selected
if you check the Save check-box on the Desktop Manager's Shutdown
Dialog Box (OS/2 Version 1.x) or when you select Shutdown from the
Workplace Shell Desktop (Os/2 Version 2.x).
Selecting this option exits from MemStat.
This menu allows the user to request help, and to display the About
dialog box. It contains the following options:
Help for help...
Selecting this option displays general help applicable to the Help
Manager and its use.
Selecting this option displays extended help and information for
Selecting this option results in the display of help for the keystrokes
available in MemStat.
Selecting this option displays the Help Index for MemStat, allowing
the user to quickly find the desired help page.
This option is used to bring up the MemStat About dialog box, which
displays copyright information about MemStat, including the current
MemStat Settings Dialog Box
To change any of the MemStat settings, click on the check boxes labelled:
Display Available Memory
Checking this box results in MemStat displaying the amount of physical
memory available to applications running under OS/2.
Display Swap File Size
Checking this box results in MemStat displaying the current size of the
swap file used by OS/2.
Display Swap Disk Free Space
Checking this box results in MemStat displaying the current amount of
free space on the drive on which the swap file is stored.
To change the Timer Interval, click on the edit field and enter a
numeric value between 0 and 65535. A value of 0 will cause the update
to occur as quickly as possible, that is, about every 1/18 of a second.
Any changes made to the above fields will not be reflected in MemStat until
the "OK" push-button is selected.
Selecting the OK pushbutton will result in the contents of the dialog
fields being checked and, if there is no invalid data, the data entered
will be saved and used by MemStat in displaying the memory status
Cancel Push Button
Selecting the Cancel pushbutton will result in the dialog box closing
without saving any changes made to its fields.
Help Push Button
Selecting the Help pushbutton will result in help being displayed for
this dialog box.
About Dialog Box
The About Dialog Box gives some general information about MemStat,
including software copyright notices and the current version number.
Select "OK" to close the About Dialog Box.
The following keys are available for use within MemStat:
Alt+F4 or F3
Restore MemStat (when minimized)
Move the MemStat window
Minimize the MemStat window
Dialog Box Keys
Accept details and close dialog box
Cancel the dialog box
Set a check box on/off or perform the task described on the selected
Move to the next entry field or check box
Backspace (left arrow delete)
Delete the character to the left of the cursor
Delete the character at the cursor
End or Ctrl+Right Arrow key
Move to the end of a field
Home or Ctrl+Left Arrow key
Move to the beginning of a field.
MemStat Error Messages
If an error occurs during execution, MemStat will attempt to display
a message reporting the error and will then take appropriate action.
Currently, MemStat will report the following errors:
"Unable to create Timer"
MemStat was unable to start a new system timer. This indicates that
the system timer limit has been exceeded. To fix this problem, close
some applications that use system timers and try MemStat again.
"Must select at least one parameter to display"
At least one Memory Status parameter must be selected for display. Check
at least one of the check boxes in the Settings dialog box.
"Invalid Timer Interval Entered"
The timer interval must be set to a value between 0 and 65535. A value
of 0 will cause the update to occur as quickly as possible, that is, about
every 1/18 of a second.
"Unable to Save OS2.INI Profile Entry"
MemStat was unable to save its Profile information to OS2.INI because
of a system error. Any settings changed in this session will need to be
changed again, the next time MemStat is run. To fix this problem, check
the validity of OS2.INI using an OS2.INI editor program to confirm that
it is readable. If not, restore your latest backup of OS2.INI.
The easiest way to register that you are using MemStat is to send an
electronic mail note to Greg Jones at any of the addresses below. MemStat
is currently being distributed as freeware. By registering, you are
guaranteeing that you will find out when new releases are made.
Program License Agreement
MemStat is currently being distributed as a general interest utility.
You are free to copy and use the software for personal use and distribution
in its original, unmodified form provided no fee is charged beyond reasonable
media and/or shipping charges.
Corporate users interested in using MemStat are invited to contact
The Software Cottage regarding licensing.