ZIIP |
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This system command applies to z/OS batch, batch servers, Com-plete, CICS and TSO environments that support the use of the IBM System z Integrated Information Processor (zIIP). Prerequisite: The required Natural for zIIP product(s) must be installed at your site.
If this system command is issued from a different environment and/or without zIIP support enabled, and/or if the required Natural for zIIP product is not installed, appropriate error messages occur.
The ZIIP system command provides status and
processing information on the zIIPs used in your environment and the license
file required for the Natural for zIIP product installed at your site. In
addition, you can obtain statistics on the Natural components that cause
switches to the general central processor (GCP) and manage the component switch
counting.
For detailed information on zIIP support, usage and monitoring, refer to the Natural for zIIP documentation.
This document covers the following topics:
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PRINT |
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STAT |
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LIC |
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RESET |
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| Subfunction | Option | Explanation |
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PRINT* |
INFO |
Displays the zIIP Processing Information report. |
ROLL |
Displays the Roll Server zIIP Information report. | |
STAT |
Displays the
zIIP Component Switch
Statistics report if component switch counting has been
activated (see STAT
below).
See also Sort Options for the zIIP Component Switch Statistics to determine the sort sequence. |
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ALL
(default) |
Displays the
zIIP Processing
Information report first, followed by the
Roll Server zIIP
Information report and the
zIIP Component Switch
Statistics (if activated).
See also Sort Options for the zIIP Component Switch Statistics to determine the sort sequence. |
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STAT* |
ON |
Activates the component switch counting. |
OFF |
Deactivates the component switch counting. | |
CLR |
Clears the component switch table. | |
LIC |
ASIS |
Displays the XML-formatted zIIP license file left-justified. |
XML |
Displays the XML-formatted zIIP license file. | |
FORMATTED
(default) |
Displays the zIIP license file in free format without brackets. | |
RESET |
ALL |
Reset all counters |
SRB |
Reset the start SRB counter | |
STAT |
Reset the component switch table
(equivalent to STAT CLR)
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SWITCH |
Reset the TCB switch counter | |
TIMES |
Reset all CPU time values |
* Alternatively, you can set the keyword subparameters
STAT and PRINT of the profile parameter
ZIIP and the macro NTZIIP respectively. See
Keyword
Subparameters in the section ZIIP - zIIP
Processing (z/OS only) in the Parameter
Reference documentation.
The RESET function doesn't affect the roll server zIIP information counters and CPU times.
| Keyword | Sort Order |
|---|---|
SORTDESC |
The report is sorted ascending by the component description. |
SORTNAME |
The report is sorted ascending by the component name. |
SORTPRODUCT |
The report is sorted ascending by the product name. |
SORTSWITCHES
(default) |
The report is sorted descending by the number of TCB switches (default). |
| Keyword | Description | |
|---|---|---|
PRODUCT |
Lists the components of a
single product or a range of products specified with
product-range.
Valid values for
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ppp |
A valid product code.
Select the product that corresponds to the
three-character product code |
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p* or
pp*
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One or two leading characters.
Selects all products whose product codes start with
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ppp> |
A start value.
Selects all products with product codes greater than or
equal to |
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ppp< |
An end value.
Selects all products with product codes less than or
equal to |
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PARAMETER |
Specifies the components
to be listed.
Valid values are: |
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| * | Selects all components (default). | |
Y |
Selects only components with a
P indicator denoting that component switches can be influenced by
a parameter.
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N |
Selects only components (without a
P indicator) whose component switches cannot be influenced by a
parameter.
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This section describes the reports and statistical data provided by
the ZIIP system
command.
The zIIP Processing Information report looks similar to the example below:
+---------------- zIIP Processing Information ---------------+ | | | Advanced zIIP Support Enabled | | | | General central processors (GPs) 6 | | Integrated Information Processors (zIIPs) 1 | | zIIP SMT threads 2 | | zIIP normalization factor 10.98 | | | | Switches into TCB mode 1590303 | | SRB starts 80 | | | | Total enclave CPU time 01:00:56.411 (100.00%) | | Enclave GP time 00:12:38.305 (20.74%) | | Enclave zIIP time 00:48:18.106 (79.26%) | | | | Eligible zIIP CPU time 00:48:22.619 (100.00%) | | Enclave zIIP time 00:48:18.106 (99.84%) | | Eligible zIIP time on GP 00:00:04.513 (0.16%) | | | | (zIIP times normalized) | | | | | +------------------------------------------------------------+ |
If the z/OS system parameter PROJECTCPU=YES is set and no zIIPs are configured to the current logical partition, the report looks similar to the example below:
+--------------- zIIP Processing Information ---------------+ ! ! ! Advanced zIIP Support Enabled (PROJECTCPU) ! ! ! ! General central processors (GPs) 2 ! ! Integrated Information Processors (zIIPs) 0 ! ! ! ! zIIP normalization factor 0.00 ! ! ! ! Switches into TCB mode 938 ! ! SRB starts 6 ! ! ! ! Total enclave CPU time 00:00:06.091 (100.00%) ! ! Enclave TCB time 00:00:04.640 (76.19%) ! ! Enclave SRB time (*) 00:00:01.452 (23.81%) ! ! ! ! (*) possible zIIP offload ! ! ! ! ! ! ! +-----------------------------------------------------------+ |
This report provides the following status and processing information:
| Report Item | Explanation |
|---|---|
| Advanced zIIP Support Enabled | Indicates that the current Natural session runs with full zIIP enablement. |
| General central processors (GPs) | The number of GPs running under your z/OS system. |
| Integrated Information Processors (zIIPs) | The number of zIIPs running under your z/OS system. |
| zIIP SMT threads | The number of logical zIIPs running under your z/OS system if SMT (Simultaneous Multi-Threading) is active. |
| zIIP normalization factor | The zIIP normalization factor indicates
the ratio of zIIP to GP speed.
This factor tells you how fast your zIIP runs compared
to a throttled GP with reduced power. In the example above, the value of
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| Switches into TCB mode | The number of switches from SRB (service request block) into TCB (task control block) processing mode due to any system service calls that had to be issued. The corresponding switches back into SRB mode are not counted. |
| SRB starts | The number of times an SRB process was
started.
The counter is incremented by 1 for the first SRB at each session start and for the SRB restart after an abnormal termination in SRB mode. |
| Total enclave CPU time | The total CPU time (GP plus zIIP) consumed by the Natural WLM enclave. |
| Enclave GP time | The total GP time consumed within the Natural WLM enclave. |
| Enclave zIIP time | The total zIIP time consumed within the Natural WLM enclave. |
| Eligible zIIP CPU time | The total CPU time qualified for zIIP. |
| Eligible zIIP time on GP | The CPU time within the Natural WLM
enclave on the GP qualified for zIIP but not used by it.
A non-zero value means that zIIP-eligible workload could not be offloaded because no zIIP was available. |
For details on the statistics items, refer to Natural zIIP Processing: TCBs, SRBs and Enclaves and Calculating the CPU Time in the Natural for zIIP documentation.
For hints on improving zIIP exploitation, refer to Tuning zIIP Usage in the Natural for zIIP documentation.
| ENTER or PF5 | Updates the report data. |
| PF7 | Switches to the
zIIP Component Switch
Statistics.
(Applies to |
| PF8 | Switches to the
Roll Server zIIP
Information report.
(Applies to |
The Roll Server zIIP Information report looks similar to the example below:
+------------- Roll Server zIIP Information -------------+ ! ! ! Roll Server zIIP CPU Time Usage in Subsystem QA82 ! ! Job Name QAROLL82 ! ! ! ! Total WLM enclave CPU time .... 387524 ! ! Qualified zIIP CPU time ....... 387252 ! ! Eligible zIIP CPU time on GCP 133 ! ! Total WLM enclave zIIP CPU time 387119 ! ! Total WLM enclave zIIP CPU time (%) 99.89 ! ! ! ! (All times in milliseconds; zIIP times normalized.) ! ! ! +--------------------------------------------------------+ |
This report provides the following status and processing information:
| Report Item | Explanation |
|---|---|
| Total WLM enclave CPU time | The total CPU (GCP plus zIIP) time consumed by the current WLM enclave. |
| Qualified zIIP CPU time | The time qualified for zIIP usage on SRB, which is the sum of the eligible plus the total zIIP CPU time. |
| Eligible zIIP CPU time on GCP | The CPU time on the GCP qualified for a
zIIP but not used by it.
A non-zero value means that zIIP-eligible workload could not be offloaded because no zIIP was available. |
| Total WLM enclave zIIP CPU time | The total zIIP CPU time consumed by the current WLM enclave. |
| Total WLM enclave zIIP CPU time (%) | The percentage of the total zIIP CPU time consumed by the current WLM enclave. In the example above, Natural was able to offload 99.88 % of the total CPU load to a zIIP. |
The zIIP Component Switch Statistics report lists all non-zero TCB switches and the components that cause these switches as shown in the following example:
+------------------ zIIP Component Switch Statistics -------------------------+ ! ! ! Prd Component Description TCB Switches % P ! ! --------------------------------------------------------------------------- ! ! NAT CMDBAS Call Adabas ............................... 321587 37.43 P ! ! NSB NSBCNXP DB2 ConnecX access ........................ 140356 16.33 ! ! NVS NVSEXSH VSAM I/O scheduler ........................ 120904 14.07 ! ! RPC RPC2ETB RPC interface to EntireX Broker Stub ...... 108488 12.62 P ! ! NAT NATGWSTG Request handler for Natural Development Ser 94914 11.04 P ! ! NAT CMPINIT Session initialization exit ............... 58361 6.79 ! ! ADA LNKDWA_Z TP dependent wait ......................... 10947 1.27 ! ! NAT CMWAIT Wait for specified interval ............... 1234 0.14 P ! ! COR COR00009 Program delete ............................ 612 0.07 ! ! NDB NDBWLI DB2 IFI calls (DSNWLI) and RRSAF (DSNRLI) a 527 0.06 P ! ! NAT CMFREMP Release working storage ................... 373 0.04 P ! ! COR COR00001 Lock contention ........................... 261 0.03 ! ! NAT CMDLET Release external module ................... 213 0.02 P ! ! NAT ZPINIT Initialization of zIIP support ............ 193 0.02 ! ! NAT CMABEND Controlled abend routine .................. 133 0.01 ! ! --------------------------------------------------------------------------- ! ! Total 859103 ! !-----------------------------------------------------------------------------+ |
Components are service routines of the Natural nucleus, Natural
add-on products or other Software AG products (for example, Adabas) that cause
TCB switches when executing, for example, Adabas calls or external
CALLNAT requests. The report contains the following:
The code of the product (for example, NAT for
Natural) to which the component belongs,
The name and description of the component,
The number of switches per component,
The percentage of the component switches,
The indicator P set for component switches that
can be influenced by a parameter, and
The total number of component switches.
ENTER or
PF5 |
Updates the statistics data. |
| PF4 | Opens a window where you can specify selection criteria (product range and component switches that can be influenced by a parameter) for the zIIP Component Switch Statistics report. |
| PF7 | Scrolls backward one page (in a long
list) or switches to the zIIP
Processing Information report.
(Only applies on the first page of a list and if
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| PF8 | Scrolls forward one page (in a long
list) or switches to the zIIP
Processing Information report.
(Only applies on the last page of a list and if
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| PF9 | Toggles between the two displays
described for SORTPRODUCT and SORTSWITCHES in
Sort Options for zIIP
Component Switch Statistics.
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| PF10 | Toggles between the two displays
described for SORTDESC and SORTNAME in
Sort Options for zIIP
Component Switch Statistics.
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| PF11 | Toggles between the two displays
described for SORTDESC and SORTSWITCHES in
Sort Options for zIIP
Component Switch Statistics.
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In online mode, you can use a menu to set the
ZIIP report options according to your
requirements.
To display the ZIIP menu
At any command prompt, enter the following:
ZIIP MENU
The of the
ZIIP command is displayed, in which you can select
the required subfunction and option(s) described in
Syntax Element
Description.
You can use the user exit routine ZIIPUX01 to specify
the default settings for the PRINT options of the
ZIIP system command. The source is provided as subprogram
ZIIPUS01 in the Natural system library SYSEXT. Copy
the cataloged object of ZIIPUX01 to the Natural system library
SYSLIB, SYSLIBS or SYSTEM. For details,
see the subprogram ZIIPUS01 in the system library
SYSEXT.
You can use the Natural application programming interface
USR8204N to perform all functions of the
ZIIP system command. For details, see the text
object USR8204T and the program USR8204P in the
Natural system library SYSEXT.
