[chpill]

  When you have a really good JIT, as Java does, this tradeoff is gone

Is there a way to visualize the machine code generated by the JVM when optimizing the same kind of code as the examples shown in the talk you mention? I tried putting the following into godbolt.org, but i'm not sure I'm doing it right:

  public class DontForgetToFlush {
      public static void example(java.io.BufferedWriter w) throws java.io.IOException {
          w.write("a");
          w.write("b");
          w.write("c");
          w.write("d");
          w.write("e");
          w.write("f");
          w.write("g");
          w.flush();
      }
      public static void main(String... args) throws java.io.IOException {
          var os = new java.io.OutputStreamWriter(System.out);
          var writer = new java.io.BufferedWriter(os, 100);
          example(writer);
      }
  }

[pron]

You can ask the JVM to dump the actual instructions (https://javanexus.com/blog/printing-assembly-code-hotspot-ji...).

Just note that there may be differences between the very old APIs (as in your example), and the newer NIO (https://docs.oracle.com/en/java/javase/24/docs/api/java.base...), and you need to pay attention to text output that undergoes characeter set encoding (as in your example) vs binary output.

[vips7L]

You can use jit watch: https://github.com/AdoptOpenJDK/jitwatch