serde_json::from_reader benchmark 2

main.rs

use serde::{Deserialize, Serialize};

#[derive(Clone, Deserialize, Serialize)]
struct Foo {
    number: u32,
    string: String,
    vector: Vec<Bar>,
}

#[derive(Clone, Deserialize, Serialize)]
struct Bar {
    float: f32,
    string: String,
}

fn main() {
    /*
    let bars: Vec<_> = (0..100).map(|i| Bar {
        float: i as f32,
        string: "s".to_owned(),
    }).collect();

    let foos: Vec<_> = (0..10000).map(|i| Foo {
        number: i,
        string: "this is a short string".to_owned(),
        vector: bars.clone(),
    }).collect();

    let v = serde_json::to_vec(&foos).unwrap();
    std::fs::write("foos.json", v).unwrap();
    */

    let reader = std::fs::File::open("foos.json").unwrap();
    //let reader = std::io::BufReader::new(reader);
    let foos: Vec<Foo>  = serde_json::from_reader(reader).unwrap();
    println!("{}", foos.len());
}