PC Ext: Estimating Memory Requirements for EXTERNAL.EXE

Last reviewed: September 24, 1997
Article ID: Q78803

2.10 3.00 3.20 3.50 MS-DOS kbenv

The information in this article applies to:

Microsoft Mail for PC Networks, versions 2.1, 3.0, 3.2, and 3.5

You can use the following formula to estimate how much memory the Microsoft Mail for PC Networks External Mail program (EXTERNAL.EXE) will require to run without memory problems.

There are two major categories of memory usage for EXTERNAL.EXE:

General Memory Requirements

      Memory    Needed For
      ------    ----------------------

      200K      EXTERNAL.EXE
      64K       message storage
      16K       modem traffic
      ------

      280K      general memory required

External Postoffice Servicing Requirements (Servicing memory is required for mail dispatching, and so on.)

The servicing memory requirements will vary directly with the number of postoffices that External is addressing. The servicing memory requirements need to be calculated for each postoffice separately because the number of external networks will be different.

The following figures can be used to determine each postoffice's servicing requirements:

      Number of Local Users           Multiplied (*) by 37 bytes
      Number of dispatch networks     Multiplied (*) by 38 bytes
      Number of dispatch postoffices  Multiplied (*) by 90 bytes
      Number of external networks     Multiplied (*) by 45 bytes
      Number of external postoffices  Multiplied (*) by 115 bytes
      Number of gateways              Multiplied (*) by 83 bytes
      Number of gateway nodes/DGNs    Multiplied (*) by 83 bytes

   For example:

   The following example will show the EXTERNAL.EXE memory requirements
   dispatching between two postoffices, each with 100 users defined. No
   gateways are involved.

      General External Memory Requirements

                200K  base EXTERNAL.EXE
                 64K  for message storage
                 16K  for modem traffic
                ----
                280K  General Memory Requirements

        Servicing Requirements for two postoffices

        Postoffice 1
        ------------

                100 local users           *  37   =  3700 bytes
        +         1 dispatch networks     *  38   =    38 bytes
        +         1 dispatch postoffice   *  90   =    90 bytes
        +         2 external networks     *  45   =    90 bytes
        +        10 external postoffices  * 115   =  1150 bytes
        +         0 gateways              *  83   =     0 bytes
        +         0 gateway nodes/DGNs    *  83   =     0 bytes
                                                     ----
                                                     5068 bytes

        Postoffice 2
        ------------

                100 local users           *  37   =  3700 bytes
        +         1 dispatch networks     *  38   =    38 bytes
        +         1 dispatch postoffice   *  90   =    90 bytes
        +         1 external networks     *  45   =    45 bytes
        +         1 external postoffices  * 115   =   115 bytes
        +         0 gateways              *  83   =     0 bytes
        +         0 gateway nodes/DGNs    *  83   =     0 bytes
                                           ----
                                        +  3988 bytes

        Total External PO Requirements            =  9056 bytes

        Total External Requirements          =    289,056 bytes

Additional reference words: 2.10 3.00 3.20 3.50 memory requirements
KBCategory: kbenv
KBSubCategory: MailPCExt
Keywords : kbenv
Version : 2.10 3.00 3.20 3.50
Platform : MS-DOS

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Last reviewed: September 24, 1997
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