IBM System/360 System Programmer's Guide

version of the load module is used until an IPL operation takes place
and the new directory entry for the module is made resident.
SELECTING ENTRIES FOR THE RESIDENT BLDL TABLE
Any load module in the linkage library may have its directory entry
placed in the resident BLDL table. Other items you should consider are:
1. Table size (each entry requires 40 bytes of storage).
2. Frequency of use of the load module.
Table Size
The resident BLDL table is incorporated in the system nucleus. The
additional storage required is governed by the number of table entries
and is acquired by reducing the amount of dynamic storage area
available, i.e., the system nucleus expands. Each installation using
the resident BLDL table option must determine the amount of storage it
can afford for the resident BLDL table.
Frequency of Use
Short of placing the entire linkage library directory in the resident
BLDL table, you make the option effective by selecting directory entries
representing the load modules which are called most frequently. Your
choice will depend on th~ system configuration and the operating
practices of your installation. You should give loaa modules of the
scheduling components of the system, linkage editor, and language
processor(s) thorough consiueration.
THE RESIDENT ACCESS METHOD OITION
This option places access rrethod load modules in the system nucleus
and creates a resident list cf the loaded modules. A LOAD macro-
instruction requesting any access method mCQule first scans the resident
list. If the module is listed, no fetch operation is required.
You list, in a member of SYS1.PROCLIB, the
access method load modules to be made resident.
standard list is IEAIGGOO. A standard list
access method roodules is supplied by IBM, and is
~tarter system under the standard member name.
load module names of
ThE:; member name for tne
of rrost frequently used
in SYS1.PROCLIB of the
The creation of procedure library lists and the content of the IBM
supplied standard list is discussed later in this chapter. The next
section discusses some considerations pertaining to the use of the
aCCESS method option.
CONSIDERATIONS FOR USE
The storage space requirea fOT each access method module consists of
the byte requirements of the module and its associated load request
block (LRB). The storage Estimates publication provides storage
requirements for'the resident access method option when used with the
standard procedure library list provided by IBM.
All access method modules placed in the system nucleus are "only
loadable". ATTACH, LINK, and XCTL macro-instructions cannot refer to
the resident modules.
The Resident BLDL Table and Resident Access Method Options 117

IBM System/360 Specifications

General

Brand	IBM
Model	System/360
Category	Desktop
Language	English