IBM OS/390 User Manual
15.2.2.5 SMESSAGE or LMESSAGE
This option requests the compiler to supply messages in short or long format.
This is particularly useful for interactive users using only slow terminals
(printers).
This is particularly useful for interactive users using only slow terminals
(printers).
15.2.2.6 IMPRECISE
This is used for 360/91 and 360/195 only.
15.2.2.7 INTERRUPT
This option requests that control be given to an ATTENTION type of ON- UNIT in
case of attention at the terminal. It is only of interest for conversational programs
written to execute under TSO or CMS, or when tuning a batch program written
interactively under TSO or CMS when the PL/I CHECKOUT compiler is not
available.
case of attention at the terminal. It is only of interest for conversational programs
written to execute under TSO or CMS, or when tuning a batch program written
interactively under TSO or CMS when the PL/I CHECKOUT compiler is not
available.
15.2.2.8 TERMINAL
This option is used only in an interactive environment. It allows the specification
of additional options controlling the display of results at the terminal. The
following options can be specified with the option TERM: AGGREGATE
ATTRIBUTES ESD INSOURCE LIST MAP OPTIONS SOURCE STORAGE and XREF.
of additional options controlling the display of results at the terminal. The
following options can be specified with the option TERM: AGGREGATE
ATTRIBUTES ESD INSOURCE LIST MAP OPTIONS SOURCE STORAGE and XREF.
15.2.3 Execution Options
These are not unique to MVS!! For DOS, however, they apply only to CICS/VS
transactions!
transactions!
15.2.3.1 ISASIZE
This option allows control of the management of storage used by PL/I during the
execution of the program. By default, PL/I obtains an ISA (Initial Storage Area) of
half the available storage after the load module is loaded, unless a user
installation established some other default when the PL/I Transient Library was
installed.
execution of the program. By default, PL/I obtains an ISA (Initial Storage Area) of
half the available storage after the load module is loaded, unless a user
installation established some other default when the PL/I Transient Library was
installed.
Setting the proper ISASIZE for every projection MVS PL/I program and
every DOS/VS PL/I CICS/VS transaction is the most important single thing one
can do to optimize PL/I program performance!
can do to optimize PL/I program performance!
15.2.3.2 REPORT
This option allows you to obtain statistics on the memory usage by PL/I during
execution of the program. Refer to 15.11, “Storage Management in PL/I” on
page 345. Use the output of the REPORT option to set ISASIZE correctly. Do
execution of the program. Refer to 15.11, “Storage Management in PL/I” on
page 345. Use the output of the REPORT option to set ISASIZE correctly. Do
not
run programs in production with this option turned on. It is expensive.
15.2.3.3 COUNT FLOW
It is possible at execution to suppress the COUNT and FLOW options requested
at compilation. This is useful as it is possible to have a program in production,
compiled with these options, but turn them off at execution time. If a problem
arises, it will then be possible to repeat the execution of the program without
having to recompile it. Normally, however, these options are
at compilation. This is useful as it is possible to have a program in production,
compiled with these options, but turn them off at execution time. If a problem
arises, it will then be possible to repeat the execution of the program without
having to recompile it. Normally, however, these options are
″
compiled out
″
of
production programs, since they add overhead in the executable code.
Chapter 15. PL/I
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