JDK-8273117 : Release Note: Experimental Compiler Blackholes Support
- Type: Sub-task
- Component: hotspot
- Sub-Component: compiler
- Affected Version: 17
- Priority: P4
- Status: Resolved
- Resolution: Delivered
- Submitted: 2021-08-30
- Updated: 2021-09-01
- Resolved: 2021-09-01
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Unresolved : Release in which this issue/RFE will be addressed.
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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.
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| JDK 17 |
|---|
17Resolved  |
Description
The experimental support for Compiler Blackholes is added. These are useful for low-level benchmarking, to avoid dead-code elimination on the critical paths, without affecting the benchmark performance. Current support is implemented as CompileCommand, accessible as `-XX:CompileCommand=blackhole,<method>`, with the plan to eventually graduate it to a public API. JMH is already able to auto-detect and use this facility when instructed/available. Please consult JMH documentation for the next steps.