GraalVM is a recent development from Oracle. It's supposed to replace HotSpot just-in-time compiler technology, but actually, it's much more. From a JIT compiler to a language implementation framework for JVM to a native image generator, it's going to change how software for JVM is written and run.

1. MACIEJ PRZEPIÓRA / SENIOR DEVELOPER
The Need for Speed
What is GraalVM?

2. Maciej Przepióra
Molecular biologist/so0ware
developer/homebrewer
@maciejprzepiora
gitlab.com/macprzepiora
h;ps://vaadin.recipes
ABOUT ME

3. spartez.com

4. What’s
current JVM status?
Why GraalVM is needed?
PRESENTATION PLAN
What is GraalVM?
And what
deep magic does it use?
Is it worth my 9me?
And how to get started?

5. What is GraalVM?

6. A new JIT compiler,
devised to be C2 replacement

7. Why GraalVM is needed?
What’s the current status of JVM?

8. Java is slow
CONTROVERSY 1 CONTROVERSY 2
Java is fast

9. IS JAVA FAST OR SLOW?
Of course, it depends

10. Stack-based VM interpreKng
byte codes

11. JIT
HotSpot has been around for
last 20 years

12. JIT
On the other hand, HotSpot
has been around for last 20
years

13. HotSpot is opKmised for DC
deployments

14. CONTROVERSY 3
Java is not cloud-friendly

15. But Spring Boot Cloud?
But NeRlix OSS?

16. CONTROVERSY 4
Java is not the best language
in the whole world

17. Again, it depends.

18. Polyglot programming

19. Polyglot programming on
JVM

20. Polyglot programming out of
JVM

21. Sloooow
INTERPROCESS IN-PROCESS
Hard

22. What if I want to implement a
new language?

23. 3. Bytecode & bc interpreter
Like Java 1.0!
1. Parser + AST interpreter
That’s how Ruby used to work
2. Run9me (GC, threads etc.)
4. JIT compiler
Good luck with that!

24. Foreign Func9ons Interface
C is universal interface
FFI

25. It’s a bit easier on JVM

26. 3. Bytecode & bc interpreter
Like Java 1.0!
1. Parser + AST interpreter
That’s how Ruby used to work
2. Run9me (GC, threads etc.)
4. JIT compiler
Good luck with that!

27. …but HotSpot is a black-box.

28. SUMMARY
HotSpot is deep magic and
has its own issues, but sKll
seems beVer than other
opKons

29. What is GraalVM?

30. JIT compiler

31. Language implementaKon
framework
(Truffle)

32. SubstrateVM & naKve-image

33. GraalVM deep magic

34. GRAALVM JIT COMPILER
ParKal Escape Analysis
•Enhanced escape analysis
•Allows for:
•Scalar replacement
•Lock elision

35. SCALAR REPLACEMENT
•Avoid allocaKon on heap
•Replace stack frame
variables with CPU registers

36. EXAMPLE
int calcArea(int x, int y) {
val Point = new Point(x, y);
return point.x*point.y;
}

37. TRUFFLE
ParKal evaluaKon
& Futamura projecKons

38. PARTIAL EVALUATION
Program:
IstaKc × Idynamic=>Output
Program':
Idynamic=>Output

39. 1ST FUTAMURA PROJECTION
Program:
Iscript × Idynamic=> Output

40. 1ST FUTAMURA PROJECTION
prog*:
Idynamic=>Output

41. NATIVE IMAGE
Closed-world principle

42. And how to get started?
Is it worth your Kme?

43. Some parts
are sKll in research

44. CE is less powerful than EE

45. No official support
from Spring for naKve-image

46. How to get started?

47. Micronaut

48. Quarkus

49. Helidon

50. QuesKons?

51. Join our super team!
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