Required memory sizes for the Receive 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 Receive 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.

(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 Receive program (unit: KB).

Formula for the below-the-line storage

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

Formula for the above-the-line storage

Required memory size for the Receive program in the above-the-line storage = d + e + f

The below tables show the calculations for the substituted values.

Table D.7 Substituted Values in Calculation for Below-the-Line Storage
		Below-the-line storage	Remarks
a	Startup	224KB	Fixed value
b	I/O buffers for receive files	0KB
c	Transfer	(Number of receiving-side transferring instances executed simultaneously x 6KB) + 140KB

Table D.8 Substituted Values in Calculation for Above-the-Line Storage
		Above-the-line storage		Remarks
d	Startup	6,480KB		Fixed value
e	I/O buffers for receive files	b1 x b2 x b3
		b1	Number of receiving-side transferring instances executed simultaneously
		b2	I/O Buffer Count for Receiving (RCVBNO)
		b3	Block size of the receive files
f	Transfer	Number of receiving-side transferring instances executed simultaneously x 488KB

Calculation example

In the case of the following values, calculate the required memory sizes for the Receive program as shown below.

Table D.9 Values for this Calculation Example
Field	Value
Number of receiving-side transferring instances executed simultaneously	4
I/O Buffer Count for Receiving (RCVBNO)	5
Block size of the receive files	32KB

Required memory size for the Receive program (below-the-line storage): a: 224KB; b: 0KB; c: ((4 x 6) + 140)KB

Required memory size for the Receive program (above-the-line storage): d: 6,480KB; e: (4 x 5 x 32)KB; f: (4 x 488)KB

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

Required memory size in the below-the-line storage: a + b + c = 388KB

Required memory size in the above-the-line storage: d + e + f = 9,072KB

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