Slower Than C

[arshidkv12]

Hi I tested with xdebug profile option with grind cache. Functions are slower than c. How to speed up?

[ryangjchandler]

The difference in speed is likely due to converting between PHP types (Zval) and Rust types such as String, Vec, etc.

[joehoyle]

I think to test this assumption it could be a good idea to benchmark:

#[php_function]
fn should_be_fast(&Zval zval ) -> Zval {
    zval.shallow_clone()
}

I suspect we might actually have several inefficiencies in the calling bridging, unnecessarily allocating etc.

[ryangjchandler]

That would just be benchmarking a direct clone of a Zval though right? Not the Vec<T> allocations, etc?

[joehoyle]

I'm not sure, I think the #[php_function] may generate code that has additional allocations etc in.