JDK-8043573 : G1NewSizePercent is too coarse on very large heaps
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u20,9
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2014-05-20
  • Updated: 2019-02-11
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tbdUnresolved
Related Reports
Duplicate :  
JDK-8159961 - G1NewSize too coarse grained
Relates :  
JDK-8166500 - Adaptive sizing for IHOP causes excessively long mixed GC pauses
Description
G1NewSizePercent is used to specify the minimum young gen size as percentage of the total heap. It is a percentage, i.e valid values range from 0 to 100.

For large heaps (>100G) this can be too coarse: even specifying one percent may specify a minimum young gen size that makes it very hard to reach small pause time goals, particularly for mixed collections.

Try to come up with some way to lift this restriction.
Comments
As an alternative one can use G1NewSize/G1MaxNewSize together.
25-01-2017