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MA44526 - LIC-OTHER-WAIT RESIDENT STACKS WAIT DURING IASP ADDRESS COMPARE
ACTIVITY

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-OTHER-WAIT RESIDENT STACKS WAIT DURING IASP ADDRESS COMPARE
ACTIVITY

Error Description

In the primary instance of this wait condition, SWA (Save While
Active) was running against IASP data.                          
                                                               
Many jobs stuck waiting on IASP resident stacks. The resident  
stacks are waiting on a SWA insert to complete. Due to memory  
constraints the SWA insert tasks were waiting on the resident  
stacks.                                                        
                                                               
Service keywords:                                              
resstackpool -i                                                
SMSWAINSxx tasks                                                
SmSaveWhileActiveNucleus                                        

Problem Summary

In the primary instance of this wait condition, SWA (Save While
Active) was running against IASP data.                          
                                                               
Many jobs stuck waiting on IASP resident stacks. The resident  
stacks are waiting on a SWA insert to complete. Due to memory  
constraints the SWA insert tasks were taking a page fault which
had to be looked up in the IASP permanent directory.  Getting  
the lock on a permanent directory page caused an address compare
to happen which is gets stuck waiting on the SWA stacks.        
                                                               
Service keywords:                                              
resstackpool -i                                                
SMSWAINSxx tasks                                                
SmSaveWhileActiveNucleus                                        

Problem Conclusion

We will avoid turning on the address compare flag for the IASP  
permanent directory pages.                                      

Temporary Fix

Comments

Circumvention


PTFs Available

R710 MF63096 PTF Cover Letter   7192
R720 MF60030 PTF Cover Letter   5310

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... No
Component.................................. 9400DG300
Failing Module.......................... RCHMGR
Reported Release................... R720
Duplicate Of..............................




System i Support

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Document Information

Modified date:
28 July 2017