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To the moon and beyond with Java 17 APIs! | DevNation Tech Talk
The document discusses the advancements in Java 17, specifically highlighting the new Vector API and its capabilities for optimized vector computations, as well as the Foreign Linker API for accessing native memory and APIs. It also covers the OpenJDK Flight Recorder (JFR) for performance monitoring and profiling, along with improvements in event streaming for real-time processing. Additional topics include JEPs, performance benchmarks, and removed APIs, showcasing the enhancements and changes in Java 17 that benefit developers.
To the moon and beyond with Java 17 APIs! | DevNation Tech Talk
- 1. To the Moonand Beyond With Java 17 APIs! Gunnar Morling Software Engineer, Red Hat @gunnarmorling
- 4. #Java17APIs @gunnarmorling “Commit [ourselves]to achieving the goal, before this decade talk is out, of landing a man Duke on the Moon and returning him safely to the Earth” Today’s Mission John F. Kennedy
- 5. The Vector API1 JFR Event Streaming 2 3 The Foreign Linker API
- 6. #Java17APIs @gunnarmorling ● Projects ○Debezium ○ Quarkus ○ Hibernate ● MapStruct, JfrUnit, kcctl 🧸 ● Java Champion ● @gunnarmorling Gunnar Morling Open Source Software Engineer at Red Hat
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- 8. #Java17APIs @gunnarmorling The VectorAPI JEPs 338 / 414 / 417 java.util.Vector?!
- 9. #Java17APIs @gunnarmorling “Introduce anAPI to express vector computations that reliably compile at runtime to optimal vector instructions on supported CPU architectures, thus achieving performance superior to equivalent scalar computations.” The Vector API JEPs 338 / 414 / 417 JEP 417
- 10. #Java17APIs @gunnarmorling The VectorAPI Goals Clear and concise API 1 Reliable runtime compilation and performance on x64 (SSE, AVX) and AArch64 (NEON, SVE) 2 3 4 Platform agnostic Graceful degradation
- 11. #Java17APIs @gunnarmorling The VectorAPI Use Cases ● Image, text, signal processing ● Encryption ● Machine Learning ● etc.
- 12. #Java17APIs @gunnarmorling The VectorAPI Terminology
- 13. #Java17APIs @gunnarmorling The VectorAPI Example – Scalar c = -(a2 + b2 )
- 14. #Java17APIs @gunnarmorling The VectorAPI Example – Vector
- 15. #Java17APIs @gunnarmorling The VectorAPI Example – Vector
- 16. #Java17APIs @gunnarmorling The VectorAPI Example – Vector
- 17. #Java17APIs @gunnarmorling The VectorAPI Example – Vector
- 18. #Java17APIs @gunnarmorling The VectorAPI Example – Vector
- 19. #Java17APIs @gunnarmorling The VectorAPI A Very Rich API
- 20. #Java17APIs @gunnarmorling The VectorAPI Example – FizzBuzz
- 21. #Java17APIs @gunnarmorling The VectorAPI FizzBuzz – Performance Benchmark Mode Cnt Score Error Units scalarFizzBuzz thrpt 5 2204774,792 ± 76581,374 ops/s simdFizzBuzz thrpt 5 8830433,250 ± 69955,161 ops/s MacBook Pro 2019 (2,6 GHz 6-Core Intel Core i7, 32GB RAM)
- 22. #Java17APIs @gunnarmorling The VectorAPI Examining Assembly Code with Hsdis
- 23. #Java17APIs @gunnarmorling The VectorAPI Examining Native Assembly "conditionally copies byte elements from the source operand to the destination operand depending on mask bits defined in the implicit third register argument" felixcloutier.com
- 24. Detour Identifying JDK API Changesby Yourself
- 25. #Java17APIs @gunnarmorling Detour: IdentifyingAPI Changes javaalmanac.io
- 26. #Java17APIs @gunnarmorling Detour: IdentifyingAPI Changes github.com/AdoptOpenJDK/jdk-api-diff
- 27. #Java17APIs @gunnarmorling Detour: IdentifyingAPI Changes chriswhocodes.com/jepsearch.html
- 28. #Java17APIs @gunnarmorling Detour: IdentifyingAPI Changes JavaDoc ab Version 17
- 29. 1 JFR Event Streaming3 2 The Vector API The Foreign Linker API
- 30. #Java17APIs @gunnarmorling ● Accessingnative Memory (JEP 383) ● Accessing native APIs (JEP 389) ○ Moving specific parts to native code ○ Using existing native libraries ● Vector API Projekt Panama Integration of JVM and Native Code
- 31. #Java17APIs @gunnarmorling Foreign LinkerAPI Using Method Handle
- 32. #Java17APIs @gunnarmorling Foreign LinkerAPI Using Method Handle
- 33. #Java17APIs @gunnarmorling Foreign LinkerAPI Using Method Handle
- 34. #Java17APIs @gunnarmorling ● Provideor create header file ● Generate binding (Panama EA build required) Foreign Linker API jextract
- 35. #Java17APIs @gunnarmorling Foreign LinkerAPI jextract
- 36. #Java17APIs @gunnarmorling Foreign LinkerAPI github.com/sundararajana/panama-jextract-samples
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- 38. #Java17APIs @gunnarmorling ● RMIActivation ● Pack 200 ● Nashorn JavaScript-Engine ● Deprecated for Removal in Java 17 ○ Applet API ○ Security Manager Detour: Removed APIs Tackling the Maintenance Burden → 🤷 → 🤷 → Standalone Nashorn (since Java 15), GraalJS
- 39. 1 JFR Event Streaming 2 3 TheVector API The Foreign Linker API
- 40. #Java17APIs @gunnarmorling OpenJDK FlightRecorder ● “JVM framework for troubleshooting, monitoring and profiling” ● 150+ built-in event types ● Support for custom events ● Open source since Java 11 ● Meant for “Always on” usage in production
- 41. #Java17APIs @gunnarmorling JFR EventTypes https://bestsolution-at.github.io/jfr-doc/
- 42. #Java17APIs @gunnarmorling JFR EventStreaming JEP 349 ● Processing JFR events in “real-time” ● Use Cases ○ Export to monitoring services ○ Performance tests (JfrUnit) ○ Predictive analytics
- 43. #Java17APIs @gunnarmorling JFR EventStreaming API
- 44. #Java17APIs @gunnarmorling JFR EventStreaming Out-of-process: github.com/flight-recorder/health-report
- 45. #Java17APIs @gunnarmorling ● Performancetests based on metrics like latency/throughput often unstable ● JfrUnit ○ Assertions based on proxy metrics ○ Plain JUnit-Tests ○ Analysis via JDK Mission Control JFR Event Streaming Use Case: Performance Regression Tests with JfrUnit “Unit testing, for performance”
- 46. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
- 47. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
- 48. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
- 49. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
- 50. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
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- 52. #Java17APIs @gunnarmorling JFR EventStreaming Asserting Socket IO with JfrUnit
- 53. #Java17APIs @gunnarmorling ● ClassData Sharing: Memory mapped class metadata ● Default CDS archive for JDK classes since Java 12 (JEP 341) ● AppCDS: CDS archive for your own classes Detour: Faster Start-up with AppCDS No Need to Go Native?
- 54. #Java17APIs @gunnarmorling Detour: AppCDS QuarkusApp – Time to First Response Hetzner Cloud CX4 (4 vCPUs, 16GB RAM)
- 55. #Java17APIs @gunnarmorling Detour: AppCDS Start-upTime of Apache Kafka
- 57. #Java17APIs @gunnarmorling Java 17– An Update Well Worth It! Many Improvements Across the Board... Language API Runtime
- 58. #Java17APIs @gunnarmorling What WeDidn’t Talk About... New Language Features
- 59. #Java17APIs @gunnarmorling ● ShenandoahGC ● Improvements to native GraalVM binaries ○ JFR support ○ Debug symbols ● AArch64/Linux port; project Lilliput ● Persistent memory support (JEP 352, mashona.io) ● Supported OpenJDK distribution Red Hat & OpenJDK Past and Current Contributions
- 60. #Java17APIs @gunnarmorling ● JEPSearch https://chriswhocodes.com/jepsearch.html ● Blog (Vector API, JFR Event Streaming, AppCDS, etc.) https://www.morling.dev/ ● JfrUnit https://github.com/moditect/jfrunit ● Red Hat build of OpenJDK https://developers.redhat.com/products/openjdk/overview Resources
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