JDK-8242057 : Release Note: Improved Ergonomics for G1 Heap Region Size
- Type: Sub-task
- Component: hotspot
- Sub-Component: gc
- Affected Version: 15
- Priority: P3
- Status: Closed
- Resolution: Delivered
- Submitted: 2020-04-02
- Updated: 2021-05-14
- Resolved: 2020-05-19
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| JDK 15 |
|---|
15Resolved  |
Description
The default heap region size calculation has been changed to return larger regions by default. The calculation still aims to have 2048 regions, but two aspects have changed: - Only the maximum heap size is considered. The old calculation also took the initial heap size into consideration, but this can give unexpected behavior when no heap size is set. - The region size is rounded up to the nearest power of 2 instead of down. This will return larger region sizes in cases where the maximum heap size is not a power of 2. These changes improve startup and runtime performance.