NSUBTKS parameter: Difference between revisions

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{{Template:NSUBTKS parameter subtitle}}
==Summary==
==Summary==
<dl>
<dl>
Line 10: Line 11:
<dd>All
<dd>All
<dt>Introduced
<dt>Introduced
<dd><var class="product">Model 204 V6.1</var> or earlier
<dd><var class="product">Model 204 V2.1</var> or earlier
</dl>
</dl>
==Description==
==Description==
<p>The maximum number of pseudo subtasks that can be generated by <var class="product">Model&nbsp;204</var> during a run.</p>
<p>
<p>Pseudo subtasks are internal processes that perform special functions such as automatic check pointing and controlling input and output operations for SNA Communications Server terminals.</p>
The maximum number of [[Controlling system operations (CCAIN)#Pseudo subtasks|pseudo subtasks]] that can be generated by <var class="product">Model&nbsp;204</var> during a run.</p>
<p>The algorithm to determine if NSERVS, NUSERS, and NSUBTKS are too large is: </p>
<p>
Pseudo subtasks are internal processes that perform special functions such as automatic checkpointing and controlling input and output operations for SNA Communications Server terminals.</p>
<p>
The algorithm to determine if <var>[[NSERVS_parameter|NSERVS]]</var>, <var>[[NUSERS_parameter|NUSERS]]</var>, and <var>NSUBTKS</var> are too large is: </p>
<p class="code">IF NUSERS=NSERVS
<p class="code">IF NUSERS=NSERVS
   NUSERS + NSUBTKS + 1 > 32767
   NUSERS + NSUBTKS + 1 > 32767
Line 21: Line 26:
   NSERVS + NUSERS + NSUBTKS + 1 > 32767
   NSERVS + NUSERS + NSUBTKS + 1 > 32767
</p>
</p>
<p>If too many process control blocks have been requested, the user receives the following message:</p>
<p>
If too many process control blocks have been requested, the user receives the following message:</p>
<p class="code">M204.0021: NSERVS+NUSERS(IF SWAPPING)+NSUBTKS+1 > 32767
<p class="code">M204.0021: NSERVS+NUSERS(IF SWAPPING)+NSUBTKS+1 > 32767
</p>
</p>
<p>Each server, user, pseudo subtask, and the Scheduler has a process control block. There may not be more than 32767 process control blocks.</p>
<p>
<p>If you receive the M204.0021 message, adjust the combination of NUSERS, NSERVS, and NSUBTKS + 1 so that it does not exceed 32767.</p>
Each server, user, pseudo subtask, and the Scheduler has a process control block. There may not be more than 32767 process control blocks.</p>
<p>The <var class="product">Model&nbsp;204</var> services that call pseudo subtasks are listed in the table below along with the number of pseudo subtasks that each uses. Set NSUBTKS to at least the sum of the pseudo subtasks called for by your configuration of <var class="product">Model&nbsp;204</var>.</p>
<p>
<p>For more information about the pseudo subtasks, see the <var>Model&nbsp;204 System Manager's Guide</var>. </p>
If you receive the M204.0021 message, adjust the combination of <var>NUSERS</var>, <var>NSERVS</var>, and <var>NSUBTKS</var> + 1 so that it does not exceed 32767.</p>
<p>
The <var class="product">Model&nbsp;204</var> services that call pseudo subtasks are listed in the table below along with the number of pseudo subtasks that each uses. Set <var>NSUBTKS</var> to at least the sum of the pseudo subtasks called for by your configuration of <var class="product">Model&nbsp;204</var>.</p>
 
<table>
<table>
<caption>Pseudo subtasks for Model[204 services</caption>
<caption>Pseudo subtasks for Model 204 services</caption>
<tr><th>Service</th><th>Pseudo subtasks</th></tr>
<tr class="head"><th>Service</th><th>Pseudo subtasks</th></tr>
<tr><th><var>SNA Communications Server 3270 interface (z/OS, z/VSE)</var></th><td>3 for IODEV=7 </td></tr>
 
<tr><th><var>SNA Communications Server 3767/NTO interface</var></th><td>3 for IODEV=37</td></tr>
<tr><th><var>SNA Communications Server 3270 interface (z/OS, z/VSE)</var></th>
<tr><th><var>CMS/SNA Communications Server interface</var></th><td>
<td>3 for <var>[[IODEV_parameter|IODEV]]</var>=7 </td></tr>
<p>3 for IODEV=7</p>
 
<tr><th><var>SNA Communications Server 3767/NTO interface</var></th>
<td>3 for IODEV=37
<p class="note"><b>Note:</b> The IODEV=37 setting is no longer supported as of Model 204 version 7.6.</p></td></tr>
 
<tr><th><var>CMS/SNA Communications Server interface</var></th>
<td>3 for IODEV=7
<p>2 for each SNA Communications Server terminal ACB</p>
<p>2 for each SNA Communications Server terminal ACB</p>
</td></tr>
</td></tr>
<tr><th><var>Horizon or Parallel Query Option/204</var></th><td>
 
<p>2 for each open link (z/OS) </p>
<tr><th><var>Horizon or <var>[[Model_204_configurations_and_operating_environments#Parallel_Query_Option.2F204|Parallel Query Option/204]]</var></var></th>
<td>2 for each open link (z/OS)  
<p>4 for each open link (z/VM)</p>
<p>4 for each open link (z/VM)</p>
</td></tr>
</td></tr>
<tr><th><var>Connect:</var></th><td>
 
<p>2 for each open Horizon for VTAM link (4, if under z/VM)</p>
<tr><th><var>Connect<span class="superstar">&#9733;</span></var></th>
<td>2 for each open Horizon for VTAM link (4, if under z/VM)
<p>1 for each open CRAM or IUCV SQL link</p>
<p>1 for each open CRAM or IUCV SQL link</p>
<p>3 for first open Horizon for TCP/IP link; 2 for each subsequent link</p>
<p>3 for first open Horizon for TCP/IP link; 2 for each subsequent link</p>
</td></tr>
</td></tr>
<tr><th><var>Performance statistics</var></th><td>
 
<p>1 for printing partial statistics</p>
<tr><th><var>Performance statistics</var></th>
<td>1 for printing partial statistics
<p>1 for logging to audit trail</p>
<p>1 for logging to audit trail</p>
</td></tr>
</td></tr>
<tr><th><var>Checkpointing</var></th><td>
 
<p>1 for RCVOPT '1' bit on</p>
<tr><th><var>Checkpointing</var></th>
<p>1 for nonzero CPTIME setting</p>
<td>1 for <var>[[RCVOPT_parameter|RCVOPT]]</var> '1' bit on
<p>1 for nonzero setting of CPTO, CPTQ, or both</p>
<p>1 for nonzero <var>[[CPTIME_parameter|CPTIME]]</var> setting</p>
<p>1 for nonzero setting of <var>[[CPTO_parameter|CPTO]]</var>, <var>[[CPTQ_parameter|CPTQ]]</var>, or both</p>
<p>1 for the CHKPAWW pseudo subtask    (XA and ESA environments only)</p>
<p>1 for the CHKPAWW pseudo subtask    (XA and ESA environments only)</p>
</td></tr>
</td></tr>
<tr><th><var></var></th></tr>
 
<tr><th><var>CMS external security</var></th><td>1 for a security service machine </td></tr>
<tr><th><var>CMS external security</var></th><td>1 for a security service machine </td></tr>
<tr><th><var>LIOS</var></th><td>1 for each LIOS ring stream</td></tr>
<tr><th><var>LIOS</var></th><td>1 for each LIOS ring stream</td></tr>
<tr><th><var>SESPST</var></th>
<td>1 for managing sessions
</td></tr>
</table>
</table>
[[Category:System parameters]]
[[Category:System parameters]]
[[Category:Parameters]]
[[Category:Parameters]]

Latest revision as of 22:37, 14 March 2022

Max number of pseudo-subtasks

Summary

Default value
4
Parameter type
System
Where set
On User 0's parameter line
Related products
All
Introduced
Model 204 V2.1 or earlier

Description

The maximum number of pseudo subtasks that can be generated by Model 204 during a run.

Pseudo subtasks are internal processes that perform special functions such as automatic checkpointing and controlling input and output operations for SNA Communications Server terminals.

The algorithm to determine if NSERVS, NUSERS, and NSUBTKS are too large is:

IF NUSERS=NSERVS NUSERS + NSUBTKS + 1 > 32767 ELSE NSERVS + NUSERS + NSUBTKS + 1 > 32767

If too many process control blocks have been requested, the user receives the following message:

M204.0021: NSERVS+NUSERS(IF SWAPPING)+NSUBTKS+1 > 32767

Each server, user, pseudo subtask, and the Scheduler has a process control block. There may not be more than 32767 process control blocks.

If you receive the M204.0021 message, adjust the combination of NUSERS, NSERVS, and NSUBTKS + 1 so that it does not exceed 32767.

The Model 204 services that call pseudo subtasks are listed in the table below along with the number of pseudo subtasks that each uses. Set NSUBTKS to at least the sum of the pseudo subtasks called for by your configuration of Model 204.

Pseudo subtasks for Model 204 services
ServicePseudo subtasks
SNA Communications Server 3270 interface (z/OS, z/VSE) 3 for IODEV=7
SNA Communications Server 3767/NTO interface 3 for IODEV=37

Note: The IODEV=37 setting is no longer supported as of Model 204 version 7.6.

CMS/SNA Communications Server interface 3 for IODEV=7

2 for each SNA Communications Server terminal ACB

Horizon or Parallel Query Option/204 2 for each open link (z/OS)

4 for each open link (z/VM)

Connect★ 2 for each open Horizon for VTAM link (4, if under z/VM)

1 for each open CRAM or IUCV SQL link

3 for first open Horizon for TCP/IP link; 2 for each subsequent link

Performance statistics 1 for printing partial statistics

1 for logging to audit trail

Checkpointing 1 for RCVOPT '1' bit on

1 for nonzero CPTIME setting

1 for nonzero setting of CPTO, CPTQ, or both

1 for the CHKPAWW pseudo subtask (XA and ESA environments only)

CMS external security1 for a security service machine
LIOS1 for each LIOS ring stream
SESPST 1 for managing sessions
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