JDK-8158919 : Investigate better TLAB sizing for large VMs in G1
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 9
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2016-06-07
  • Updated: 2019-02-11
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tbdUnresolved
Related Reports
Relates :  
JDK-8067341 - Modify PLAB sizing algorithm to waste less
Description
Some JFR measurements showed that by default, on a large VM (1 TB) of a customer a huge amount of allocation outside TLAB occur.

Like a ~1hr JFR recording of only this event amounts to 2.3GB of data.

There might be issues like we had with PLAB sizing on G1 (e.g. JDK-8030849/JDK-8067341; maybe there are issues with region boundaries and something like a "net PLAB size" would be helpful).

Investigate and propose fixes.