JIT Compilation for VA Smalltalk
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ESUGThis document summarizes a presentation about a new JIT compiler for the VA Smalltalk virtual machine. Some key points: - A new just-in-time (JIT) compiler has been added that is template-based and powered by LLVM. It generates optimized native code and avoids stack usage where possible. - The JIT compiler includes optimizations like inline caches and super-instructions. It compiles methods by copying templates, doing optimizations, and performing relocation fixes. - Early benchmarks show the new JIT compiler provides a significant performance boost over the previous interpreter-only version, such as a 12.8 second runtime for a typical use case versus 17.5 seconds previously.
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Exploring GitHub Actions through EGAD: An Experience Report
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JIT Compilation for VA Smalltalk
- 1. JIT Compilation for VA Smalltalk Alexander Mitin Senior Software Engineer amitin@instantiations.com @instantiations linkedin.com/in/alexandermitin instantiations.com Cologne, Germany – August 28th ESUG 2019
- 3. VA Smalltalk VM › Performance-critical parts powered by LLVM › CMake-based build system › FFI powered by libffi › True headless optional VM › VA Smalltalk is IoT ready!
- 4. VA Smalltalk VM Update › New interpreter for ARM › Improved interpreter for x86 › Return struct by value for FFI › New JIT compiler for x86 (ARM-ready)
- 6. New JIT Compiler › Template-based › Powered by LLVM › Very fast
- 7. Templates › Generated by LLVM at build-time › Minimum platform-specific parts › Maximum code reuse with interpreter › Templates as a standard object file
- 8. A Typical Template TPpushLiteral: movabsq $FXMethodLiteralOp0, %rax movq %rax, -8(%r15) addq $-8, %r15
- 9. Compiling › Copy templates › Do optimisations › Perform relocations fixup
- 10. Optimisations › Super-instructions › Avoid stack usage where possible › Inline caches
- 11. Inline caches › Monomorphic inline cache › Polymorphic inline cache › Megamorphic inline cache
- 12. A Send Template TPsendArgs0: movq %rdx, 88(%rbp) movabsq $FXReturnAddress, %rsi movq %rsi, 96(%rbp) movl $768, 224(%rbp) movabsq $FXSendArgsReturnTo, %rax xorl %edx, %edx rex64 jmpq *%rax [ inline cache data ]
- 13. Decompilation › PC is native in a stack frame › No additional memory footprint › Frame is marked if it is running native code
- 14. Benchmarks
- 17. Factorial
- 18. Prime Summing
- 20. Mandelbrot
- 21. Spectral Normalization the spectral norm of an infinite matrix A, with entries a11=1, a12=1/2, a21=1/3, a13=1/4, a22=1/5, a31=1/6, etc Fraction arithm & arrays
- 23. N-Body Models planet orbits, lots of floating- point operations
- 24. Fasta DNA chains. Integer & arrays
- 25. Chameneos-redux Creatures of different colors. Process switching
- 26. Customers Feedback We did some testing with x86 and got good results: In a typical use case we have execution times e.g. VA8.0.2x86 17.5 sec VA9.0.1x86 21.5 sec VA9.2x86_JIT 12.8 sec — An Instantiations VA Smalltalk Customer
- 27. Conclusion
- 28. VA Smalltalk 9.2 › Available now under Early Customer Access Program (ECAP) at instantiations.com/ecap › v.9.2 Release later this year
- 30. © Instantiations, Inc. All Rights Reserved. Thank you for your attention Questions?