Flags Description
-----------------

-Xcompactexplicitgc
             Full compaction each time system GC is called

-Dos400.rr   Use round-robin thread home assignment


Environment Variables
---------------------
JAVA_HOME    Tells i5/OS which JVM to use

SPINLOOPTIME Configure the number of times to retry a busy lock before
             yielding the processor to another thread


System Values
-------------
QTHDRSCADJ   Thread resources adjustment.  Specifies whether or not the system
             should make adjustments to the affinity of threads currently
             running in the system.

               0  No automatic adjustment of threads is made by the system.
                  Threads will continue to have affinity to the resources which
                  they are currently assigned to until they end or until this
                  system value is changed.

               1  The system dynamically makes adjustments of threads'
                  affinity to the system's resources.  

QTHDRSCAFN   Thread resources affinity.  Specifies whether or not secondary
             threads will have affinity to the same group of processors and
             memory as the initial thread.  It also specifies the degree to
             which the system tries to maintain the affinity between threads
             and the subset of system resources they are assigned to.  If the
             hardware on your system supports affinity to system resources,
             some workloads may experience increased performance by tailoring
             this system value.  By grouping threads together that share a
             common set of data in main storage, it is possible to improve
             caching and memory access.

             Thread resources affinity group:

               *NOGROUP  Threads are not grouped together with the initial
                         thread.  Workloads that utilize the full processing
                         power of a system may perform better when using this
                         option.

               *GROUP    Threads have affinity to the same group of processors
                         and memory as the initial thread.  Multi-threaded
                         workloads that share data between the threads within
                         a process may perform better when using this option.

             Thread resources affinity level

               *NORMAL   Threads will use any processor or memory in the
                         system if the resources they have affinity to are not
                         readily available.

               *HIGH     Threads will only use the resources they have
                         affinity to, and will wait until they become
                         available if necessary.

Other Tuning
------------
CALL PGM(QWCTMQTM)
             Change system-wide time quantum value. The quantum determines the
             execution time interval between the time a task is dispatched and
             when it may be preempted.