Where can I find how many CUs different operations and syscalls cost?

Question

I know I can get this by trial and error and just running the operations I want to test it, but I'd imagine it's written down somewhere too. Where?

Answer 1

Found my answer in the end, the CU amount per syscall can be found in the codebase here.

Answer 2

Check out this, by Jonas,

https://github.com/solana-developers/cu_optimizations?tab=readme-ov-file#how-to-measure-cu

The best way to measure CU is to use the solana program log.

/// Total extra compute units used per compute_fn! call 409 CU
/// https://github.com/anza-xyz/agave/blob/d88050cda335f87e872eddbdf8506bc063f039d3/programs/bpf_loader/src/syscalls/logging.rs#L70
/// https://github.com/anza-xyz/agave/blob/d88050cda335f87e872eddbdf8506bc063f039d3/program-runtime/src/compute_budget.rs#L150
#[macro_export]
macro_rules! compute_fn {
    ($msg:expr=> $($tt:tt)*) => {
        ::solana_program::msg!(concat!($msg, " {"));
        ::solana_program::log::sol_log_compute_units();
        let res = { $($tt)* };
        ::solana_program::log::sol_log_compute_units();
        ::solana_program::msg!(concat!(" } // ", $msg));
        res
    };
}

You put it in front and after the code block you want to measure like so:

compute_fn!("My message" => {
    // Your code here
});