![Program readability
1 to: array size do: [ :i | (array at: i) yourself ].
array do: [ :elem | elem yourself ].
array do: #yourself.](https://image.slidesharecdn.com/4-vmperformance-170607110952/75/pharo-vm-performance-17-2048.jpg?cb=1668323036)
![Program readability
1 to: array size do: [ :i | (array at: i) yourself ].
array do: [ :elem | elem yourself ].
array do: #yourself.
0 2 5 20
87M/
sec
28M/
sec
13M/
sec
3.7M
/sec
15M/
sec
21M/
sec
10M/
sec
3.9M
/sec
94M/
sec
40M/
sec
22M/
sec
6.5M
/sec](https://image.slidesharecdn.com/4-vmperformance-170607110952/75/pharo-vm-performance-18-2048.jpg?cb=1668323036)
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Pharo VM Performance
- 2. Myself • Clément Béra • 2011-2013: Engineer on the Pharo VM • 2013-2017: PhD student • Optimisations of the Pharo VM JIT compiler
- 5. Plan • Pharo 5 (stable) • First time we out benched most competitors • Pharo 6 (released next week ???) • Pharo 7
- 7. GC • Pharo 5 • New memory manager Spur • Pharo 6 • New compactor • Pharo 7 • Incremental GC ???
- 8. Pharo 5: Spur • Efficient scavenges • In most applications, most GC time is now in scavenges Code execution GC
- 9. Pharo 6: New compactor Loading a 200 Mb Moose Model in 250 Mb image February April Total time 2 min 1 min 2 sec Time in Full GC 1 min 2 sec Full GC avg pause 15 sec 0.5 sec Time in scavenge 15 sec 15 sec
- 10. Pharo 6: New compactor Loading a 200 Mb Moose Model in 250 Mb image February April Total time 2 min 1 min 2 sec Time in Full GC 1 min 2 sec Full GC avg pause 15 sec 0.5 sec Time in scavenge 15 sec 15 sec <- GC tuning gets it down to 5 sec
- 11. Pharo 7: Incremental GC ?? • Full GC pauses: ~500 ms at ~500Mb • Java default GC at 200ms soft real time • Solution • Incremental marking • Incremental compaction
- 12. Code execution • Pharo 5: • Spur got 1.8x • Pharo 6: • Polishing and micro-optimisations • Pharo 7: • Sista gets 1.5x-5x
- 13. Pharo 5: Spur 1.8x • Class table speeds-up look-up caches • New immediate objects • 22 bits hash
- 14. Pharo 6 • Register allocation improvements • Two path compilation • Frameless code for setter-like methods
- 15. Sista: Pharo 7 ? • Program introspection • Speculate on types based on previous runs • Optimize frequently used code • Deoptimize and reoptimize code incorrectly speculated
- 16. Goals • Program readability • Performance
- 17. Program readability 1 to: array size do: [ :i | (array at: i) yourself ]. array do: [ :elem | elem yourself ]. array do: #yourself.
- 18. Program readability 1 to: array size do: [ :i | (array at: i) yourself ]. array do: [ :elem | elem yourself ]. array do: #yourself. 0 2 5 20 87M/ sec 28M/ sec 13M/ sec 3.7M /sec 15M/ sec 21M/ sec 10M/ sec 3.9M /sec 94M/ sec 40M/ sec 22M/ sec 6.5M /sec
- 19. Performance 0 1 2 3 4 5 6 A* ThreadRing SpectralNorm JSJSON BinaryTree DeltaBlue Richards TCAP Kmeans Sista Pharo
- 20. Getting stable • Support most development workflow • Support image recompilation • Integration has started
- 21. In-image design Smalltalk image Virtual machine Cogit CompiledCode to native code Machine-specific optimisations Scorch CompiledCode to CompiledCode Smalltalk-specific optimisations CompiledCode (persisted across start-ups) native functions (discarded on shut-down) Baseline JIT Optimising JIT
- 22. Missing • IDE support • Debugger • Methods to show • Stability, testing
- 23. Are you interested ? • Incremental GC ? • VM performance ? • VM features ? • Come and talk to us !
- 24. We are looking for… • Use-cases showing what to improve • Large real-world benchmarks • Contributors • Investment
- 25. Conclusion • Pharo 5: Fastest VM • Pharo 6: Polishing • Pharo 7: Going further