JDK-8259349 : -XX:AvgMonitorsPerThreadEstimate=1 does not work right
- Type: Bug
- Component: hotspot
- Sub-Component: runtime
- Affected Version: 16
- Priority: P4
- Status: Resolved
- Resolution: Fixed
- OS: generic
- CPU: generic
- Submitted: 2021-01-06
- Updated: 2021-03-11
- Resolved: 2021-01-12
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| JDK 17 |
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17 b05Fixed  |
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Description
The AvgMonitorsPerThreadEstimate option does not work quite right when trying to use a value lower than the default of 1024. The _in_use_list_ceiling variable is statically initialized to AvgMonitorsPerThreadEstimate and that happens before cmd line options are processed. So when you try to use -XX:AvgMonitorsPerThreadEstimate=1 you end up with an _in_use_list_ceiling of 1024 + <#-of-JavaThreads>. I see an _in_use_list_ceiling of 1034 in some of the testing that I'm doing for JDK-8226416.
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