Processor cycles performance checklist

Note:

Minimizing physical I/Os by employing large data buffers and keeping programs in storage reduces processor use, if adequate central and expanded storage is available.

Item Topic
General
Reduce or turn off CICS® trace CICS trace: performance considerations
   
Terminal, VTAM® and SNA
Implement VTAM high performance option processing Using the MVS high performance option (HPO) with VTAM
Increase terminal scan delay Adjusting the terminal scan delay (ICVTSD)
Minimize SNA terminal data flows Adjusting the number of transmissions in SNA transaction flows (MSGINTEG, and ONEWTE)
Reduce SNA chaining Using SNA chaining to segment large messages (TYPETERM RECEIVESIZE, BUILDCHAIN, and SENDSIZE)
   
Task control considerations
Adjust maximum tasks (MXT) Setting the maximum task specification (MXT)
Control certain tasks by transaction class Using transaction classes (MAXACTIVE) to control transactions
Define CICS maps with device suffixes Using the device-dependent suffix option for BMS map suffixing
   
MRO/ISC considerations
Implement MVS™ cross-memory services with MRO CICS intercommunication facilities and performance: overview
Implement MRO fastpath facilities CICS intercommunication facilities and performance: overview
Implement MVS cross-memory services with shared database programs Setting DBCTL minimum threads (MINTHRD)
Use CICS intercommunication facilities CICS intercommunication facilities and performance: overview
   
Database considerations
   
Journaling
Increase activity keypoint frequency (AKPFREQ) value Setting the activity keypoint frequency (AKPFREQ)
   
Temporary storage and transient data
Increase temporary storage queue pointer allocations Tuning the use of CICS temporary storage (TS)
Increase use of main temporary storage Tuning the use of CICS temporary storage (TS)
Review the use of CICS transient data facilities Optimizing the performance of the CICS transient data (TD) facility
   
Miscellaneous
Use only required CICS monitoring facilities CICS monitoring facility: performance considerations
Review use of required CICS recovery facilities CICS recovery: performance considerations
Review use of required CICS security facilities CICS security: performance considerations
Increase region exit interval Tuning the region exit interval (ICV)
Review use of program storage Defining programs as resident, nonresident, or transient
Prioritize transactions Prioritizing tasks

Related tasks
Performance checklists
Input/output contention performance checklist
Virtual storage above and below 16MB line performance checklist
Real storage performance checklist
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