IBM OS Linkage Editor and Loader GC28-6538

APPENDIX G: STORAGE CONSIDERATIONS
The loader requires main storage space for the following items:
• Loader code.
• Data management access methods.
• Buffers and tables used by the loader (dynamic storage).
• Loaded program (dynamic storage).
Region size includes all four of the above items; the SIZE option
refers to the last two items.
For the SIZE option, the minimum required main storage is 4K 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 3K plus the size of the loaded
program, and PL/I needs at least 8K plus the size of the loaded program.
Buffer number (BUFNO) and block size (BLKSIZE) could also increase this
minimum size. Table 18 shows the appropriate storage requirements in
bytes.
The maximum main storage that can be used is whatever main storage is
available up to 8192K.
Allor part of the main storage required is obtained from user
storage. If the access methods are made resident at IPL time, they are
allocated in system storage. However, 6K is always reserved for system
use.
In an MVT environment the loader code could also be made resident in
the link pack area. If so, it requires the following space: IEWLDRGO,
the control/interface module (alias LOADER), approximately 400 bytes;
IEWLOADR, the loader processing portion, approximately 13,250 bytes.
The size of the loaded program is the same as if the program had been
processed by the linkage editor and program fetch.
The loader does not use auxiliary storage space for work areas.
Appendix G: Storage Considerations 221