Use i5/OS™ performance system values to view and change priority, performance adjustments, and processing values for the system.
To access the performance category of system values, select Configuration and Services in iSeries™ Navigator. Then, select System Values.
If you are familiar with the i5/OS character-based interface, you will notice that iSeries Navigator uses descriptive names for the system values. For a quick overview of the performance system values available in iSeries Navigator (and their counterparts in the character-based interface), refer to the following table. Follow the links to learn more about each system value.
Performance system values:
| Name in iSeries Navigator | Description of system value | Name in character-based interface |
|---|---|---|
| Dynamically adjust job priorities of interactive jobs | Sets the job priorities of interactive jobs | QDYNPTYADJ |
| Dynamically adjust job priorities within priority bands | Sets job priorities within priority bands to be dynamically adjusted. | QDYNPTYSCD |
| Automatically adjust memory pools and activity levels | Specifies when to automatically adjust memory pools and activity levels. | QPFRADJ |
| Maximum eligible threads | Specifies the maximum number of eligible threads. | QMAXACTLVL |
| Machine memory pool size | Specifies the size of the machine memory pool. | QMCHPOOL |
| Base memory pool minimum size | Specifies the minimum base memory pool. | QBASPOOL |
| Base memory pool maximum eligible threads | Specifies maximum number of eligible threads. | QBASACTLVL |
| Move interactive jobs to base pool at end of time slice | Specifies whether to move interactive jobs to base pool at the end of the time slice or not. | QTSEPOOL |
| Communications configuration recovery | Specifies whether or not recovery attempts are made and how many attempts to take. | QCMNRCYLMT |
| Communications arbiter jobs, at restart | Specifies the number of communications arbiter system jobs that are available to process work for controllers and devices. | QCMNARB |
| Available display station pass-through server jobs | Specifies the number of target display station pass-through server jobs that are available to process i5/OS display station pass-through, iSeries Access workstation function (WSF), and other 5250 emulation programs on programmable workstations. | QPASTHRSVR |
| Parallel processing for queries and indexes | Specifies whether to use parallel processing and what to use it for. | QQRYDEGREE |
| Database query time limit | Sets the time limit for a database query. | QQRYTIMLMT |
| Lock libraries in a user job's library search list | Prevents other jobs from deleting or renaming the libraries in the search list. | QLIBLCKLVL |
| Allow background database statistics collection | Specifies what requests are allowed to be processed by system job, QDBFSTCCOL. | QDBFSTCCOL |
| Thread affinity | Specifies whether or not secondary threads will have affinity to the same group of processors and memory as the initial thread. | QTHDRSCAFN |
| Automatically adjust thread resources | Specifies whether or not the system should dynamically make adjustments to the affinity of threads currently running on the system. | QTHDRSCADJ |