SEQPDL parameter: Difference between revisions

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the amount of free space that must be present in the user's Push Down       
the amount of free space that must be present in the user's Push Down       
List in order for the SOUL sequencer to proceed with the next             
List in order for the SOUL sequencer to proceed with the next             
quad code.                                                              
quad code.  
The minumum and default value is 4096 bytes.  The maximum            
                                 
value is 8192 bytes. SEQPDL is a user resettable parameter and can  
The minumum and default value of SEQPDL is 4096 bytes.   
be set on the user's parameter line or may be reset by the UTABLE    
 
command.                                                               
The maximum value is 8192 bytes.  
The old value was 1024 and was a hardcoded internally in the Model204  
 
SEQPDL is a user resettable parameter and can be set on the user's parameter line or reset by the <var>[[UTABLE_command|UTABLE]]</var> command.                                                               
 
Formerly the amount of free space was 1024, which was hardcoded internally in the Model 204  
nucleus.  With 1024 bytes there were edge cases where abends would     
nucleus.  With 1024 bytes there were edge cases where abends would     
break files. This is an attempt to allow enough PDL space so that     
break files, resulting in ERROR 2126 USER'S PUSHDOWN LIST OVERFLOWED. SEQPDL is provided to allow enough PDL space so that     
all of the lower level journaling routines can process error           
all of the lower level journaling routines can process error           
conditions without breaking files.                                     
conditions without breaking files. The default value of SEQPDL adds 3072 bytes of free space.                                     
                                                                                                              
                                                                                                              
SEQPDL might require you to increase                              
<p class="note"><b>Note:</b> If your applications' actual use of free space in the User Push Down List approaches the limit that you have set in LPDLST, to avoid a PDL overflow you might need to increase the value of LPDLST by up to 3072 bytes (or more if you set a larger value for SEQPDL). </p>
the size of the user Push Down List (UTABLE LPDLST parameter) by up to  
3072 bytes, or more if you specify a value for SEQPDL that is larger     
than the 4096 default value.  This increase should avoid any issues associated   
with ERROR 2126 USER'S PUSHDOWN LIST OVERFLOWED.  


[[Category:Parameters]]
[[Category:Parameters]]
[[Category:System parameters]]
[[Category:System parameters]]

Latest revision as of 10:10, 30 May 2017

Minimum PDL available for sequencer

Summary

Default value
4096
Parameter type
Utable
Where set
On user's parameter line or reset by UTABLE command
Related products
All
Introduced
Model 204 version 7.5

Description

The SEQPDL parameter controls the amount of free space that must be present in the user's Push Down List in order for the SOUL sequencer to proceed with the next quad code.

The minumum and default value of SEQPDL is 4096 bytes.

The maximum value is 8192 bytes.

SEQPDL is a user resettable parameter and can be set on the user's parameter line or reset by the UTABLE command.

Formerly the amount of free space was 1024, which was hardcoded internally in the Model 204 nucleus. With 1024 bytes there were edge cases where abends would break files, resulting in ERROR 2126 USER'S PUSHDOWN LIST OVERFLOWED. SEQPDL is provided to allow enough PDL space so that all of the lower level journaling routines can process error conditions without breaking files. The default value of SEQPDL adds 3072 bytes of free space.

Note: If your applications' actual use of free space in the User Push Down List approaches the limit that you have set in LPDLST, to avoid a PDL overflow you might need to increase the value of LPDLST by up to 3072 bytes (or more if you set a larger value for SEQPDL).

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