supermachine 0.3.6

//! Stress test: N concurrent acquires from one process.
//! Confirms multi-VM concurrency via subprocess pool.

use std::sync::Arc;
use std::time::Instant;
use supermachine::{Image, VmConfig};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let snap = format!(
        "{}/.local/supermachine-snapshots/nginx_1_27-alpine",
        std::env::var("HOME").unwrap()
    );
    let n = 5usize;
    let image = Arc::new(Image::from_snapshot(&snap)?);

    println!("=== priming pool with warm={n} ===");
    {
        let _vm = image.acquire_with(&VmConfig::new().with_pool_warm(n))?;
    }

    println!("=== {n} concurrent acquires ===");
    let t0 = Instant::now();
    let handles: Vec<_> = (0..n)
        .map(|i| {
            let image = Arc::clone(&image);
            std::thread::spawn(move || {
                let t1 = Instant::now();
                let vm = image.acquire().unwrap();
                let acquired = t1.elapsed();
                let out = vm
                    .exec_builder()
                    .argv(["sh", "-c", "for j in 1 2 3 4 5; do echo $j; done"])
                    .output()
                    .unwrap();
                let total = t1.elapsed();
                println!(
                    "  thread {i}: acquired in {acquired:?}, exec done in {total:?}, status={:?}",
                    out.status.code()
                );
            })
        })
        .collect();
    for h in handles {
        h.join().unwrap();
    }
    println!("\n{n} concurrent acquires + execs total: {:?}", t0.elapsed());
    Ok(())
}