JDK-8221393 : ResolvedMethodTable too small for StackWalking applications
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 13
- Priority: P3
- Status: Resolved
- Resolution: Fixed
- Submitted: 2019-03-25
- Updated: 2019-12-06
- Resolved: 2019-04-11
The Version table provides details related to the release that this issue/RFE will be addressed.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
Unresolved : Release in which this issue/RFE will be addressed.
Resolved: Release in which this issue/RFE has been resolved.
Fixed : Release in which this issue/RFE has been fixed. The release containing this fix may be available for download as an Early Access Release or a General Availability Release.
To download the current JDK release, click here.
| JDK 13 |
|---|
13 b17Fixed  |
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Description
See discussion in:
http://mail.openjdk.java.net/pipermail/zgc-dev/2019-March/000605.html
This is output from runs from that thread:
> service.gc.0:[24304.545s][debug][membername,table] ResolvedMethod entries counted 94768 removed 92352
> service.gc.0:[36944.749s][debug][membername,table] ResolvedMethod entries counted 64041 removed 61616
> service.gc.0:[36944.749s][debug][membername,table] ResolvedMethod entries counted 64041 removed 61616
> service.gc.3:[42177.904s][debug][membername,table] ResolvedMethod entries counted 19346 removed 16930
> service.gc.1:[47231.731s][debug][membername,table] ResolvedMethod entries counted 20110 removed 17694
> service.gc.1:[47231.731s][debug][membername,table] ResolvedMethod entries counted 20110 removed 17694
> service.gc.3:[52267.616s][debug][membername,table] ResolvedMethod entries counted 27426 removed 25010
> service.gc.1:[57078.463s][debug][membername,table] ResolvedMethod entries counted 30835 removed 28419
> service.gc.3:[61907.835s][debug][membername,table] ResolvedMethod entries counted 32403 removed 29987
> service.gc.2:[66916.223s][debug][membername,table] ResolvedMethod entries counted 34545 removed 32129
> service.gc.2:[71786.212s][debug][membername,table] ResolvedMethod entries counted 39112 removed 36696
> service.gc.2:[76619.460s][debug][membername,table] ResolvedMethod entries counted 34305 removed 31889
The ResolvedMethodTable size is fixed and too small:
class ResolvedMethodTable : public Hashtable<ClassLoaderWeakHandle, mtClass> {
enum Constants {
_table_size = 1007
};
This will cause performance degradation for lookups.
Time to update this to use the ConcurrentHashTable?
Comments
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