Required memory sizes for the Send program

[Content revised from the 8th edition]

Date of Revision	Description
March 5, 2024	Added as new section

This section explains how to calculate the required memory sizes for the HULFT Send program.

The calculation formula differs depending on the storage area where the code conversion table is loaded.

The storage area where the code conversion table is loaded is specified in Storage for Code Conversion Table (CODE-CONVERSION-LOCATION) in the System Environment Settings file ((HULFT.PARMLIB(HULPRM)).

For details, refer to Administration Manual.

Note

The calculations shown here are intended to serve as a guide. Calculated memory sizes and the actual memory sizes may differ depending on the system environment in use.
The formulas assume that the block size of send files is "32760".

(1) When loading the code conversion table into a "31-bit storage area"

Use the formulas shown below to calculate the required memory sizes for the Send program (unit: KB).

Formula for the below-the-line storage

Required memory size for the Send program in the below-the-line storage = a + b + c + d

Formula for the above-the-line storage

Required memory size for the Send program in the above-the-line storage = e + f + g + h

The below tables show the calculations for the substituted values.

Table D.1 Substituted Values in Calculation for Below-the-Line Storage
		Below-the-line storage	Remarks
a	Startup	520KB	Fixed value
b	Send startup tasks	Send Startup Task Count (TASK-CNT) x 8KB
c	I/O buffers for send files	0KB
d	Work File Transfer	0KB
d	Direct Transfer	0KB

Table D.2 Substituted Values in Calculation for Above-the-Line Storage
		Above-the-line storage	Remarks
e	Startup	2,842KB	Fixed value
f	Send startup tasks	Send Startup Task Count (TASK-CNT) x 240KB
g	I/O buffers for send files	Number of sending-side transferring instances executed simultaneously x I/O Buffer Count for Sending (SNDBNO) x 32KB
h	Work File Transfer	(Number of sending-side transferring instances executed simultaneously x 256KB) + 128KB
h	Direct Transfer	(Number of sending-side transferring instances executed simultaneously x 480KB) + 164KB

Calculation example

If files are sent using only Work File Transfer with the following values, calculate the required memory sizes for the Send program as shown below.

Table D.3 Values for this Calculation Example
Field	Value
Send Startup Task Count (TASK-CNT)	4
I/O Buffer Count for Sending (SNDBNO)	5
Number of sending-side transferring instances executed simultaneously	4

Required memory size for the Send program (below-the-line storage): a: 520KB; b: (4 x 8)KB; c: 0KB; d: 0KB

Required memory size for the Send program (above-the-line storage): e: 2,842KB; f: (4 x 240)KB; g: (4 x 5 x 32)KB; h: ((4 x 256) + 128)KB

The above calculations result in the following required memory sizes for the Send program:

Required memory size in the below-the-line storage: a + b + c + d = 552KB

Required memory size in the above-the-line storage: e + f + g + h = 5,594KB

(2) When loading the code conversion table into a "64-bit storage area"