Calling Native Methods Without JNI Overhead

on YouTube ↗49m

" summary

The talk explains approaches to calling native (non-Java) code from Java—covering JNI, JNA, JNR-FFI and Project Panama—and focuses on the overheads these interfaces introduce. It presents a replacement for removed HotSpot Critical Natives: a library that uses JVMCI (the JVM Compiler Interface) to enable faster external function calls, describes the approach’s limitations, and compares its performance to the alternatives.

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" chapters (12)

1. 0:00Introduction
2. 2:37Native method calls problem
3. 8:05Java vs JNI speed
4. 11:16High overhead causes
5. 19:08JDK 20 barrier optimizations
6. 21:02Native method usage examples
7. 27:13Intrinsics issues
8. 33:53Panama limitations
9. 34:15Machine code generation
10. 41:47Nalim library for JMC
11. 43:54Performance results
12. 46:44Limitations and licensing

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