Transcript

• 1. New Wind of 9.‘ A I--‘K’-L‘ '. ‘ j {.5 L_, . _ ' " . ’_ . "" "_'; ‘tr ' ’ l ‘1 er . 9 v ’ . , , «,2 g , ;r_ V_ . _ ‘. ‘:. x. , __. ..~. . _: “_" “_~.
• 2. Background Project Valhallais Project Pana I » a) ti‘; .' ‘ L ’ 1, . ' ' ' .1
• 3. I Background E
• 4. P t ,1 emo Light Speed
• 5. Memory is the New Disk
• 6. 1 Core 10 3 Register 1CLK 102KB L1 ~ 3CLK 103KB ~ 15cLK 104” SKB TM BUS ~ ZOOCLK
• 7. Avoid a Cache Miss Locate Related Data Near
• 8. Project Valhalla Value Type
• 9. class Point { final int X; final int y; }
• 10. Header Point[] pts = Header ' x Y * [ Header * x Y . ——{ Header x Y
• 11. int[] x = Header
• 12. Point[] pts = Header Value Type
• 13. value class Point { final int X; final int y; } Value Type
• 14. Primitive Type Value Type Complex Num Big Num Vector Tuple Reference Type
• 15. value class OptionalInt { private final int t;
• 16. _. ,4. «mad! 1 .1.” a x wfi ! .Ir. .
• 17. class Box<T> { private final T t; public Box(T t) { this. t = t; } public T get() { return t; } }
• 18. > javap -c -l Box class Box extends java. languObject{ private final java lang Object t; public Box(java lang Object); Code: public java lang Object get(); Code: 0: aload_0 1: getfield #2; / /Field t: Ljava/ lang/ Object; 4: areturn
• 19. public class Test { public static void main(String. ., args) { Box<Integer> box = new Box<>(10); Integer number = box. get(); } } T I la fi % public class Test { public static void main(String. ., args) { Box box = new Box(Integer. value0f(10)); Integer number = (Integer)box. get(); } }
• 20. Java Generics Type Erasure Method Type Parameter java. |ang. Object Primitive Type
• 21. Prmitive Wrapper Class Integer, Double et al. Autoboxing Autounboxing Expensive Computation
• 22. Specialization Box<int> box = new Box<>(10);
• 23. class Box<T> { private final T t; public Box(T t) { } } this. t = t3 public T get() { } return t; class Box { } private final public Box( this. t = } public return t; } ti
• 24. class Box{T= int} { private final int t; public Box(int t) { this. t = t; } public int get() { return t; } }
• 25. public javaalang. Object*T get(); Code: 0: aload_@ 1: getfield #2; / /Field t: LObject*T; 4: areturn*T f lfif"mi I I l “ ‘mi public int get(); Code: 0: aload_@ 1: getfield #2; / /Field tzint; 4: ireturn
• 26. Dark History lntStream lntFunction Optionallnt
• 27. Issues Assumption of Ref. Type T[] array = (T[])new Object[n]; from ArrayList Ref. - Primitive Overloading List#remove(int index); List#remove(Object o); Null
• 28. Project Panama ' Array 2.0 - ll {- 5‘ . u ‘ '*"~uu-'-cc -an I i ayout" ontol
• 29. int[][] nums =
• 30. int[][] nums = Header Array 2.0 1 2 5 6 Multi Dimension Index I} long Immutable
• 31. When Calling Native Code,
• 32. public interface @IgnoreError GetPid { long getPid(); ; GetPid getPid LibraryLoader ? getPid. getPid(); . create(GetPid. class) uload("c");
• 33. JNR JNR-JFFI JFFI libffi Native Code
• 34. JNR—UNIXSocket JNR—x86asm JNR—Constants JNR-JFFI JFFI l'ib'F‘F'i Native Code
• 35. Conclusion Much Faster Less Memory by Project Valhalla Project Panama
• 36. Java in the Box'' Yuichi Sakurabaf