Benchmark weights output

Question

Can someone please explain the following output:

Why did the weights generate a zero input?

• Weight::from_ref_time(0 as u64)

What is the fastest way to eyeball this and conclude whether these weights are within reason or telling me I need to rethink my implementation?

fn on_initialize(m: u32, ) -> Weight {
    Weight::from_ref_time(0 as u64)
        // Standard Error: 5_000
        .saturating_add(Weight::from_ref_time(1_242_000 as u64).saturating_mul(m as u64))
        .saturating_add(T::DbWeight::get().writes((1 as u64).saturating_mul(m as u64)))
}

Answer 1

It meant that the linear regression found a zero or negative interception point. In the later case we shift everything upwards to get to a zero intercept point.
This is a case-by-case thing, since we just throw the linear regression on it and expect it to do well.
It is obviously necessary that your call has linear complexity, otherwise the results make no sense.