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Type: Bug
Resolution: Fixed
Priority: P3
Fix Version/s: 14
Affects Version/s: 13
Component/s: hotspot
Labels:

Subcomponent:
gc
Resolved In Build:
b07

The macro G1CollectedHeap::assert_used_and_recalculate_used_equal always recalculates the bytes used in the regions, although it does not use the value in release builds.

This can cause long delays on large heaps (with many regions).

E.g. on BigRAMTester@50g heap@1m regions (50k regions) this method may take ~20ms (up to 200ms).

Note that using 1M regions on a 50g heap is not advised (and G1 will not select 1m regions)

relates to

JDK-8159979 During initial mark, preparing all regions for marking may take a significant amount of time

Resolved

JDK-8227665 Clearing collection set candidates takes a significant amount of time

Closed

JDK-8221509 Refactor assert( G1CollectedHeap::used() == recalculate_used() ) with better message

Resolved

JDK-8152948 More unaccounted other time on large machines

Closed

Assignee:: Thomas Schatzl

Reporter:: Thomas Schatzl

Votes:: 0 Vote for this issue

Watchers:: 1 Start watching this issue

Created:: 2019-07-15 03:55

Updated:: 2019-08-06 09:39

Resolved:: 2019-07-17 07:38

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