Commits on Jan 28, 2020

1. Scan Queue splitting defaults …

   Simplify the heuristic for Marking and Scavenge Scan Queue splitting
   defaults.
   
   The rule is simple: one queue per 8 GC threads, which is less than what
   we now  use, especially for low number of threads.
   
   This rule has already been used for allocation lock splitting with
   success, for a long time.
   
   Some more additional stress testing with Scavenger with 4x smaller
   workunit (32K cache size) has been performed and no regression (lock
   contention causing longer GC times) was seen.
   
   Potential benefit of this simplification is that the cost of checking if
   the global cache/packet pool is full/empty will be much lower, what will
   be important for Concurrent Scavenge that will used this info as an scan
   loop exit criteria.
   
   Signed-off-by: Aleksandar Micic <amicic@ca.ibm.com>

   

   amicic committed Jan 28, 2020
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