Accelerator Manual (G06.24+, H06.03+)

Using the Accelerator
Accelerator Manual—527303-002
4-7
A Strategy for Using the Accelerator
A Strategy for Using the Accelerator
This basic strategy shows you how to accelerate a program that runs in user code
space, does not contain embedded SQL statements, and does not contain TAL CODE
statements. This strategy uses the default Accelerator option settings. The option
settings provide the Accelerator with additional information about the program to be
accelerated. For the vast majority of programs, the default settings for these options
result in a correctly accelerated program. Either the options are concerned only with
performance, or they can be set to the “wrong” value safely; that is, their misuse is
detected and reported by the Accelerator, and can be corrected by setting the option
and running the Accelerator again. You can use this strategy working in either the
Guardian or Open System Services (OSS) environment.
1. Make sure that your program does not contain any of the variances described in
Section 2, Preparing Your Program for TNS/R Systems
or Section , Misalignment
Handling of this manual.
2. Compile and bind your TNS object program. For optimum results, retain both the
Binder and Inspect symbols regions.
Additional help is available on these topics:
Accelerator Elementary-Options Error Inheritsr
Linkable Note Notes Notlinkable
Obey Procdebug Returnsr Returnvalsize
SC Scoping-Directives SL Stmtdebug
Super-Options Suppressmsg UC UL
Userlib Warning
Topic? Super-Options
For ease of use, the Accelerator elementary option settings have been
packaged into three sets called the Accelerator super options. The
super options are Common, Fast, and Safe. You can set super options
for an entire program only. The following table shows the settings of
the elementary options for each super option:
Super options Common Fast Safe
---------------------------------------------
Atomic OFF OFF ON
InheritsCC OFF OFF ON
OvTrap ON OFF ON
SafeAliasingRules ON OFF ON
TruncateIndexing ON OFF ON
Additional help is available on these SUPER-OPTIONS subtopics:
Common Fast Safe
SUPER-OPTIONS subtopic? Common
Select Common unless you know that your program contains TAL
procedures that rely on the atomic execution of certain TNS
operations or on the inheritance of conditions codes. Common is
correct for all other programs. Common corresponds to the default
setting for each of the elementary options; however, you should set
this option explicitly to make sure that you and other programmers
know the acceleration strategy that has been chosen.
Figure 4-1. Accelerator Online Help Example