This parameter only applies if Natural for zIIP is installed with an additional module for pre-initialized thread support.
This Natural profile parameter can be used to define the name of a pre-initialized storage thread model to improve processing performance for Natural session initialization.
| Possible settings | 1 - 8 characters | The name of a pre-initialized storage thread model to be used for session initialization. | |
|---|---|---|---|
| Default setting | ' ' |
A pre-initialized storage thread model is not used for session initialization. | |
| Dynamic specification | yes | ||
| Specification within session | no | ||
Static Natural session initialization mainly comprises dynamic profile
parameter evaluation and buffer allocation/initialization, which are
CPU-intensive and often repeated in exactly the same way for many sessions. The
THPINIT profile parameter is used to save the contents
of the Natural storage thread after static session initialization and to reuse
the contents as a storage thread model for other sessions. All subsequent
sessions with the same THPINIT definition then skip
static initialization and run with the defined pre-initialized storage thread
model.
THPINIT applies to thread environments only.
However, if the THSIZE profile parameter is
used to define a thread for batch or TSO, THPINIT can
also be used for these environments.
If the Natural Roll Server is used (z/OS only), a pre-initialized storage thread model is only available for the environment (for example, CICS, IMS TM, batch or TSO) under which the model was generated. If the Natural Roll Server is not used, a pre-initialized storage thread model is stored and available in the current region only.
If a pre-initialized storage thread model is used, only the
profile parameters THPINIT and
NUCNAME are
evaluated. This applies to both static (Natural parameter module) and dynamic
(at session start) parameter definitions. As a consequence, warnings or error
messages are not returned for any other invalid or erroneous parameters.
Profile parameter logging (PLOG=ON) is not performed
for a session that runs with a pre-initialized storage thread model, even when
PLOG was specified
and saved for the original session.
A generic value specified with the profile parameter
PROFILE
parameter (set to AUTO, PROGRAM or
TERMINAL) is assigned to the value of the session for which the
pre-initialized storage thread model was saved, but not to the value of the
current session.
For a session that uses a pre-initialized storage thread model, static and dynamic parameter definitions set for the original session (in which the model was saved) can be displayed by using the Natural user exits USR4004N and USR8203N.
A saved pre-initialized storage thread model cannot be updated or
replaced. The
SYSTP R utility function
can be used to display and delete saved pre-initialized thread storage session
records from the Natural Roll Server, if available. The user ID prefix of the
Natural Roll Server is $THP.
THPINIT definitions in parameter profiles
(PROFILE or
SYS profile
parameter) and
alternative
Natural parameter modules (PARM profile
parameter) are ignored. THPINIT is only evaluated at an
early stage of session initialization, before parameter profiles and
alternative parameter modules are evaluated.
The physical terminal screen size must be equal to the screen size of the pre-initialized storage thread model.
The current storage thread size must be greater than or equal to the thread size of the pre-initialized storage thread model.
THPINIT=MYTHREAD