Batch loader requirements

The batch loader can require virtual storage space for the following items:

Batch loader code
Data management access methods
Buffers and tables used by the batch loader (dynamic storage)
Loaded program (dynamic storage).

Region size includes all four of these items; the SIZE option refers to the last two items.

For the SIZE option, the minimum required virtual storage is 4KB plus the size of the loaded program. This minimum requirement grows to accommodate the extra table entries needed by the program being loaded. For example, Fortran requires at least 3KB plus 4KB plus the size of the loaded program, and PL/I needs at least 8KB plus 4KB plus the size of the loaded program. Buffer number (BUFNO) and block size (BLKSIZE) could also increase this minimum size. Table 1 shows the appropriate storage requirements in bytes.

The maximum virtual storage that can be used is whatever virtual storage is available.

All or part of the storage required is obtained from user storage.

Table 1. Batch loader virtual storage requirements. The table shows the consideration, the approximate virtual storage requirements, and comments.
Consideration	Approximate virtual storage requirements (in bytes)	Comments
Data Management	6KB	BSAM
Object Module Buffers and DECBs	BUFNO × (BLKSIZE + 24)	Concatenation of different BLKSIZE and BUFNO must be considered. (Minimum BUFNO=2)
Load Module Buffer and DECBs	304
SYSTERM DCB Buffers and DECBs	312	Allocated if TERM option is specified
SYSLOUT Buffers and DECBs	BUFNO × (BLKSIZE + 24)	Buffer size rounded up to integral number of double words. (Minimum BUFNO=2)
Size of program being loaded	Program size	Program size is restricted only by available virtual storage
Each external relocation dictionary entry	8
Each external symbol	20
Largest ESD number	4n (n is the largest number of ESDs in any input module)	Allocated in increments of 32 entries
Fixed Loader Table Size	1260	Subtract 88 if NOPRINT is specified
Condensed Symbol Table	12n (n is the total number of control sections and common areas in the loaded program)	Built only if you invoke the binder under TSO, and space is available.
System Requirements	4000