MFASTC (AAM) task has message BPXI039I SYSTEM LIMIT SHRLIBRGNSIZE HAS REACHED XX% OF ITS CURRENT CAPACITY OF YYYYYYYY

Products

• Advanced Authentication Mainframe

Issue/Introduction

MFASTC running with Java 17 has the below message BPXI039I

BPXI039I SYSTEM LIMIT SHRLIBRGNSIZE HAS REACHED 85% OF ITS CURRENT CAPACITY OF 68157440    
BPXI039I SYSTEM LIMIT SHRLIBRGNSIZE HAS REACHED 90% OF ITS CURRENT CAPACITY OF 68157440    
BPXI039I SYSTEM LIMIT SHRLIBRGNSIZE HAS REACHED 100% OF ITS CURRENT CAPACITY OF 68157440   

Questions:

1. What is the impact to the MFASTC task if we don't increase SHRLIBRGNSIZE ?

2. Is there any tuning possible, from an AAM perspective, to avoid SHRLIBRGNSIZE reaching 100% ?

Environment

MFASTC (AAM) running with Java 17 
MFASTC task stays up and functional without interrupting other STCs behavior

Cause

Environment

Resolution

1. Verify your current  SHRLIBRGNSIZE  in BPXPRM member by issuing   D OMVS,L

Sample Output:
BPXO051I 08.21.28 DISPLAY OMVS 980               
OMVS     0010 ACTIVE             OMVS=(50)       
SYSTEM WIDE LIMITS:         LIMMSG=ALL           
                  CURRENT  HIGHWATER     SYSTEM  
                    USAGE      USAGE      LIMIT  
MAXPROCSYS            106        109        900  
MAXUIDS                24         25        500  
MAXPTYS                 0          0        800  
MAXMMAPAREA           439        439      40960  
IPCMSGNIDS             11         13        500  
IPCSEMNIDS              2          2       2000  
IPCSHMNIDS              3          3        500  
IPCSHMSPAGES            0          0     262144  
IPCMSGQBYTES          ---     708709 2147483647  
IPCMSGQMNUM           ---        112      10000  
IPCSHMMPAGES          ---          0      25600  
SHRLIBRGNSIZE    68157440   68157440   68157440  
SHRLIBMAXPAGES          0          0       4096  
MAXUSERMOUNTSYS         0          0          0  
MAXUSERMOUNTUSER        0          0          0  
MAXPIPES               29         32      15360  

2. For the above scenario, since the Current Usage has reached 100% of System Limit

Stay with Java 17, update the MFAPARMS member to add the below and restart MFASTC task.
export _BPXK_DISABLE_SHLIB=YES

3.  Issue D OMVS,L
from the output, you will notice that the SHRLIBRGNSIZE has shrunk back to a lot less than 100%.

Additional Information

From the output of D OMVS,L You will notice that the SHRLIBRGNSIZE has shrunk back to a lot less than 100%.