tivrfoa

// https://play.rust-lang.org/?version=stable&mode=debug&edition=2021&gist=ae0048c018c77abd71b3c5121e02511a

trait Animal {
    fn do_sound(&self);
}

struct Dog;
impl Animal for Dog {
    fn do_sound(&self) {
        println!("hoho");

tivrfoa

Question

Regarding Java code:

Let's suppose you have a static method that accepts a few interfaces. Different object instances always call it with a concrete combination of the interfaces, but C2 ends up with megamorphic code. How would you improve that?

ChatGPT 3.5

When you have a static method that accepts interfaces and different object instances call it with various combinations of those interfaces, and you observe megamorphic behavior (where the JVM struggles to optimize due to multiple possible types), you can consider a few strategies to improve performance: >

tivrfoa

1.) Download a Nerd Font

2.) Unzip and copy to ~/.fonts

3.) Run the command fc-cache -fv to manually rebuild the font cache

tivrfoa

jel;18.6
jel;12.8
jel;20.7
jel;13.8
jel;26.7
jel;17.7
jel;24.7
jel;18.4
jel;10.7
jel;21.9

tivrfoa

use std::rc::Rc;
use std::cell::RefCell;

#[derive(Debug)]
struct Node {
    n: u32,
    next: Option<Rc<RefCell<Node>>>,
}

type NodeT = Option<Rc<RefCell<Node>>>;

tivrfoa

use std::cell::Cell;

#[derive(Debug)]
struct Node {
    n: usize,
    next: Cell<usize>,
}

fn main() {
    let nodes = {

tivrfoa

/*
$ cargo run --release --bin sp1
    Finished release [optimized] target(s) in 0.09s
     Running `target/release/sp1`
9227465
14930352
24157817
39088169
63245986
102334155

tivrfoa

/*
After reading the description:

Character   Meaning
c           Matches any literal character c.
. (period)  Matches any single character.
^           Matches the beginning of the input string.
$           Matches the end of the input string.
*           Matches zero or more occurrences of the previous character.

tivrfoa

/*

Benchmark                       Mode  Cnt       Score       Error  Units
LinkedListBenchmark.arrayDeque  avgt    6   86861,575 ±  6681,783  ns/op
LinkedListBenchmark.arrayList   avgt    6  207511,921 ± 20828,824  ns/op
LinkedListBenchmark.linkedList  avgt    6   70281,152 ±  9929,807  ns/op

mvn clean verify

java -jar target/benchmarks.jar LinkedListBenchmark

tivrfoa

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">

    <modelVersion>4.0.0</modelVersion>
    <groupId>loomtest</groupId>
    <artifactId>csp-game-of-life</artifactId>
    <packaging>jar</packaging>
    <name>CSP Game of Life</name>
    <version>1.0.0-SNAPSHOT</version>