Comment by p2detar

7 hours ago

> as amazing or fast as Rust

For cli tools, game engines, etc. certainly so. But what about monoliths? Do we have enough data to say Rust handles long-running monolith apps exposing web and other network services better than the JVM with its hot spot? I haven’t come to any stats on that matter, yet.

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p2detar

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pas  6 hours ago

If you can encode your request processing patterns in statically sized types, then you can get the same high-level memory allocation behavior on both platforms. Arguably Rust makes this a bit easier. (Though I have no idea how much of the concepts of mechanical sympathy made it to mainstream Java.)

If you have some kind of super vague complicated patchwork of plugins that all contribute to processing, then the JVM seems to be the more convenient choice.

https://martinfowler.com/articles/mechanical-sympathy-princi...

MeetingsBrowser  6 hours ago

Indirect evidence, but parts of AWS and cloudflare have been running Rust in production for close to a decade now and neither company looks to be itching to move services back to Java.

nicce  6 hours ago

> other network services better than the JVM with its hot spot?

JVM hotspot optimization is just band-aid for something Rust does always everywhere naturally? Assuming that you use lifetimes etc properly and not going to Arc rampage.

  • za3faran  4 hours ago

    Rust:

        concat/string           time:   [77.801 ns 78.103 ns 78.430 ns]
                            change: [+0.0275% +0.3169% +0.6169%] (p = 0.03 < 0.05)
                            Change within noise threshold.
    formatted/string        time:   [31.471 ns 31.569 ns 31.699 ns]
                            change: [+0.1277% +0.3915% +0.6788%] (p = 0.01 < 0.05).   
                            Change within noise threshold.

    Java

        Benchmarks.concat      string  avgt   15   8.632 ± 0.105  ns/op
    Benchmarks.format      string  avgt   15  64.971 ± 1.406  ns/op

    Java's string concat is faster than rust's offerings.

    • nicce  3 hours ago

      I would be careful with this benchmark even thought it shows JIT efficiency. This is a special case which might not really reflect realworld - string was static? What if you use random string?