JDK-8067469 : G1 ignores AlwaysPreTouch
  • Type: Bug
  • Component: hotspot
  • Sub-Component: gc
  • Affected Version: 8u40,9
  • Priority: P3
  • Status: Resolved
  • Resolution: Fixed
  • Submitted: 2014-12-15
  • Updated: 2015-09-29
  • Resolved: 2014-12-18
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8u60Fixed 9 b45Fixed
Related Reports
Relates :  
JDK-8038423 introduced a G1 specific virtual space manager. It does not implement the AlwaysPreTouch feature, simply ignoring it.

This causes some workload (e.g. Specjbb2005 with 120G heap) have a very long first full gc with large sys time.
SQE is okay to defer.

ILW = H (regression) L (AlwaysPreTouch is used infrequently) H (no workaround) -> p2. However, this affects performance only, not correctness and should only be seen during one gc over the lifetime of the JVM, so p3 is appropriate.