What is the size of methods that JIT automatically inlines?

by

HotSpot JIT inlining policy is rather complicated. It involves many heuristics like caller method size, callee method size, IR node count, inlining depth, invocation count, call site count, throw count, method signatures etc.

Some limits are skipped for accessor methods (getters/setters) and for trivial methods (bytecode count less than 6).

The related source code is mostly in bytecodeInfo.cpp.
See InlineTree::try_to_inline, should_inline, should_not_inline functions.

The main JVM flags to control inlining are

-XX:MaxInlineLevel (maximum number of nested calls that are inlined)
-XX:MaxInlineSize (maximum bytecode size of a method to be inlined)
-XX:FreqInlineSize (maximum bytecode size of a frequent method to be inlined)
-XX:MaxTrivialSize (maximum bytecode size of a trivial method to be inlined)
-XX:MinInliningThreshold (min. invocation count a method needs to have to be inlined)
-XX:LiveNodeCountInliningCutoff (max number of live nodes in a method)

More Related Contents:

  1. How does the JVM decided to JIT-compile a method (categorize a method as “hot”)?
  2. Does Java JIT cheat when running JDK code?
  3. How do I write a correct micro-benchmark in Java?
  4. Real differences between “java -server” and “java -client”?
  5. How to see JIT-compiled code in JVM?
  6. Running jmap getting Unable to open socket file
  7. Why I can’t create an array with large size?
  8. Class JavaLaunchHelper is implemented in both … libinstrument.dylib. One of the two will be used. Which one is undefined
  9. Analyzing gc logs
  10. Java Exceptions counter on JVM HotSpot
  11. Read Java JVM startup parameters (eg -Xmx)
  12. Encourage the JVM to GC rather than grow the heap?
  13. What are ReservedCodeCacheSize and InitialCodeCacheSize?
  14. Differences between Just in Time compilation and On Stack Replacement
  15. Why doesn’t the JVM cache JIT compiled code?
  16. -XX:MaxPermSize with or without -XX:PermSize
  17. When can Hotspot allocate objects on the stack? [duplicate]
  18. How to deal with “java.lang.OutOfMemoryError: Java heap space” error?
  19. How to get VM arguments from inside of Java application?
  20. How to get a thread and heap dump of a Java process on Windows that’s not running in a console
  21. Differences between “java -cp” and “java -jar”?
  22. Inlining in Java
  23. Print All JVM Flags
  24. In which language are the Java compiler and JVM written?
  25. Java: Which of multiple resources on classpath JVM takes?
  26. Singleton across JVM or Application instance or Tomcat instance
  27. How can I specify the default JVM arguments for programs I run from eclipse?
  28. What actually causes a Stack Overflow error? [duplicate]
  29. Java heap Xms and linux free memory different
  30. Is the garbage collector guaranteed to run before Out of Memory Error?

Leave a Comment