This Natural profile parameter can be used to configure zIIP processing under Natural. It
corresponds to the NTZIIP
macro in the Natural parameter
module.
Note:
The ZIIP
setting takes effect only if Natural Batch for zIIP,
Natural for CICS for zIIP, Natural for Com-plete for zIIP or Natural for IMS for zIIP has
been installed in your z/OS environment. For further information, refer to Installing Natural
for zIIP in the Installation for z/OS
documentation.
Possible settings | See ZIIP Parameter Syntax. | ||
---|---|---|---|
Default setting | AUTO |
See ZIIP Parameter Syntax and Keyword Subparameters. | |
Dynamic specification | yes | The parameter ZIIP can be
specified dynamically only. In the Natural parameter
module, use the macro NTZIIP .
|
|
Specification within session | yes | By means of the system command ZIIP ,
the zIIP component switch statistics can be controlled and information about zIIP
processing can be displayed.
|
The following topics are covered below:
The ZIIP
parameter is specified as follows:
ZIIP =(state,keyword-subparameter=value,keyword-subparameter=value,...)
|
Or:
ZIIP =state |
Where state can be ON
, OFF
or
AUTO
.
Value | Explanation |
---|---|
ON |
zIIP support will be activated. |
OFF |
zIIP support will not be activated. |
AUTO |
zIIP support will be activated only if there is at least one
zIIP online, or if the z/OS parameter PROJECTCPU=YES is set in the
SYS1.PARMLIB member IEAOPT .
This is the default value. |
keyword-subparameter |
See Keyword Subparameters. |
Note:
If specified as a list within brackets, ON
, OFF
or
AUTO
must be the first value.
The NTZIIP
macro is specified as follows:
NTZIIP state, * IMSG=value, * IOCSIZE=value, * PNR=value, * PRINT=value, * PWCSIZE=value, * PWCXAM=value, * STAT=value, * TMSG=value
See Keyword Subparameters.
For a description of state
, see ZIIP Parameter Syntax.
IMSG
| IOCSIZE
| PNR
| PRINT
| PWCSIZE
| PWCXAM
| STAT
| TMSG
This keyword subparameter determines whether Natural issues a NAT7070 system message after Natural zIIP support has been successfully enabled during session initialization.
Value | Explanation |
---|---|
ON |
The zIIP support message is issued.
This is the default value. |
OFF |
The zIIP support message is not issued. |
This keyword subparameter can be used to determine the cache sizes for processing the primary batch I/O files CMSYNIN, CMOBJIN and CMPRINT. This can be useful when running Natural in zIIP mode because it reduces the overhead caused by switching from zIIP to GCP (general central processor) and vice versa. There is one cache for each file, the CMSYNIN input file, the CMOBJIN input file and the CMPRINT output file.
The advantage of the cache is that all I/O data is collected in the cache instead of accessing a file immediately. When the cache for the CMPRINT file fills up, the cache is flushed, that is, all records are written at once.
In order not to hide the data for too long inside the CMPRINT cache buffer, a time slice mechanism triggers an automatic flush. The flush will be triggered when both of the following conditions are met:
You enter a new record into the nonempty CMPRINT cache buffer.
The first record in the CMPRINT cache buffer was written more than 60 seconds ago.
For a CMSYNIN or CMOBJIN input file, respectively, all records for the given file are read and stored in the input cache for this file. Subsequently, Natural reads the input records directly from the input cache.
Warning: The usage of IOCSIZE may delay the appearance of output
sent to CMPRINT. |
The subparameter IOCSIZE
is specified as follows:
IOCSIZE=(CMSYNIN-cache-size, CMOBJIN-cache-size, CMPRINT-cache-size) |
Where:
Syntax Element | Value | Explanation |
---|---|---|
CMSYNIN-cache-size |
1 - 2097151 |
The
CMSYNIN-cache-size in KB is used to
allocate the cache for the CMSYNIN input file.
|
0 |
No cache for the CMSYNIN input file is allocated. This is the default value. | |
CMOBJIN-cache-size |
1 - 2097151 |
The
CMOBJIN-cache-size in KB is used to
allocate the cache for the CMOBJIN input file.
|
0 |
No cache for the CMOBJIN input file is allocated. This is the default value. | |
CMPRINT-cache-size |
64 - 2097151 |
The
CMPRINT-cache-size in KB is used to
allocate the cache for the CMPRINT output file.
|
0 |
No cache for the CMPRINT output file is allocated. This is the default value. |
Notes:
IOCSIZE=(0,0,0)
. If you want to change a
default value, you only need to specify the size to be changed, for example,
IOCSIZE=(,200)
to allocate 200 KB for the CMOBJIN cache file
only.
IOCSIZE
setting during a
session.
This keyword subparameter can be used to determine the file where the information about
zIIP processing (see the keyword subparameter PRINT
) is printed at the end of a batch session.
PNR
is ignored in server and TSO sessions.
Value | Explanation |
---|---|
0
|
The information about zIIP processing is routed to the
standard printer (CMPRINT).
This is the default value. |
1 - 31 |
The information about zIIP processing is routed to the
specified print file. If the specified print file is unavailable during session
termination, Natural returns an error message.
For more information about the
definition of Natural print files, see the profile parameter |
This keyword subparameter can be used to get information printed about zIIP processing automatically at the end of a batch session. It is ignored in server and TSO sessions.
Value | Explanation |
---|---|
INFO
|
Print zIIP processing general information only. |
STAT |
Print zIIP switch component statistics only. |
ALL |
Print both: zIIP processing general information and zIIP switch component statistics. |
OFF |
No print of zIIP processing information is generated at the
end of the session.
This is the default value. |
This keyword subparameter can be used to determine the cache sizes for print and work file I/O processing. This may be useful when running Natural in zIIP mode, because it reduces the overhead caused by switching from zIIP to GCP (general central processor) and vice versa. There is one cache for print files, one for output work files, and one for each input work file.
The advantage of the cache is that all I/O data is collected in the cache instead of accessing the file immediately. When the cache for print files or output work files fills up, the cache is flushed, that is, all records are written to their respective files at once. In case of work file input, all records for a given file are read and stored in the input cache for this file. Subsequently, Natural reads the input records directly from the input cache.
Warning: The usage of PWCSIZE can have
a negative impact on your application flow. For example, an application may receive sent
records at a later point of time since the records are not written immediately to the
desired media. Moreover, the error behavior can be different. Example: If the error
"NAT1507 - The work/print file is full." occurs, it is not displayed
immediately. Instead, the error message "NAT1532 - Error(s) during flush of
print/work file cache." is displayed later during the cache flush. The error
that actually occurred can then only be displayed with the system command LASTMSG . This means that an ON
ERROR clause for NAT1507 no longer works. |
The subparameter PWCSIZE
is specified as follows:
PWCSIZE=(print-size,work-input-size,work-output-size) |
Where:
Syntax Element | Value | Explanation |
---|---|---|
print-cache-size |
1 - 2097151 |
The print-cache-size
in KB is used to allocate the cache for all print files.
|
0 |
No cache for all print files is allocated. This is the default value. | |
work-input-cache-size |
1 - 2097151 |
The
work-input-cache-size in KB is used to
allocate a cache for each input work file.
|
0 |
No cache for each input work file is allocated. This is the default value. | |
work-output-cache-size |
1 - 2097151 |
The
work-output-cache-size in KB is used
to allocate the cache for all output work files.
|
0 |
No cache for all output work files is allocated. This is the default value. |
Notes:
PWCSIZE=(0,0,0)
. If you want to change a
default value, you only need to specify the size to be changed, for example,
PWCSIZE=(,200)
to allocate 200 KB for the input cache only.
PWCSIZE
setting during a
session.
This keyword subparameter can be used to disable the caching for print and work files
(defined with the PWCSIZE
keyword subparameter) for single or
multiple access methods defined for the files.
Disabling caching for file access methods can be useful if you want to avoid negative
impact on the logical flow of your application (see also the Warning for the
PWCSIZE
subparameter).
The subparameter PWCXAM
is specified as follows:
For a single access method:
PWCXAM=access-method |
For multiple access methods:
PWCXAM=(access-method1,access-method2,...) |
The syntax above only applies to the NTZIIP
macro in the Natural parameter
module. If you want to define more than one value dynamically, specify
PWCXAM
multiple times.
access-method
defines the type of access method
to be used. The values you can specify correspond to the values of the AM
subparameter of the
PRINT
profile parameter and the AM
subparameter of the WORK
profile
parameter, respectively.
This keyword subparameter controls the collection of component statistics for the
switches into TCB-mode. The statistics can be displayed by the system command ZIIP
during the session, or the report can be triggered by the subparameter PRINT
automatically at the end
of the session (batch only). Moreover, it is possible to control the statistics by means
of the ZIIP
command.
Value | Explanation |
---|---|
ON |
Activate zIIP switch component statistics. |
OFF |
Deactivate zIIP switch component statistics.
This is the default value. |
Note:
The setting of STAT
can be overridden by the STAT
option of the ZIIP
system
command and the application programming interface USR8204N
which
performs ZIIP
command functions. See the relevant sections in
the System Commands documentation.
This keyword subparameter determines whether Natural sends zIIP support initialization messages to the job log or the Natural standard output device, for example, a user terminal for online environments or CMPRINT for batch. This can be helpful for testing purposes.
Value | Explanation |
---|---|
ON |
All zIIP support initialization messages are sent to the Natural standard output device. |
OFF |
All zIIP support initialization messages are sent to the job
log.
This is the default value. |
ZIIP=(ON,STAT=ON,PWCSIZE=(200,,300),IOCSIZE=(100,100,500))
NTZIIP AUTO, * STAT=ON, * PWCSIZE=(500,), * IOCSIZE=(,,2000), * PRINT=ALL