JDK-8035560 : Investigate improved or alternative predictors for G1
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u20,9
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2014-02-21
  • Updated: 2019-02-11
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tbdUnresolved
Related Reports
Relates :  
JDK-8035557 - Pause time predictions off for mixed collections due to wrong rs_length estimation
Description
G1 uses linear regression to predict future values of several metrics to predict pause time.

E.g. JDK-8035557 shows that the prediction takes a considerable time to pick up changes, in the worst case never reaching the actual values to get accurate predictions.

Investigate the following:
  - alternate predictors
  - the linear regression used also does not take the time between the samples into account - maybe this improves accuracy too.
Comments
G1 in reality only uses weighted averages, not the mentioned linear regression.
23-02-2015