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Pallet parameters account for all parameters read weight #8

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merged 6 commits into from
Aug 6, 2024
Merged

Pallet parameters account for all parameters read weight #8

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5861a10
account for all parameters on_initialize
TarekkMA Aug 2, 2024
60d3b3a
whitelist storage
TarekkMA Aug 2, 2024
5276bf9
remove whitelist
TarekkMA Aug 5, 2024
34af46a
add proof size
TarekkMA Aug 5, 2024
f9559c8
Apply suggestions from code review
TarekkMA Aug 5, 2024
3c15d2d
rewrite weight
TarekkMA Aug 5, 2024
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14 changes: 14 additions & 0 deletions substrate/frame/parameters/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -167,6 +167,15 @@ pub mod pallet {
type WeightInfo: WeightInfo;
}

#[pallet::hooks]
impl<T: Config> Hooks<BlockNumberFor<T>> for Pallet<T> {
fn on_initialize(_: BlockNumberFor<T>) -> Weight {
let items = Parameters::<T>::iter().count() as u64;
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@RomarQ RomarQ Aug 2, 2024 •
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Looking at the support/procedural/src/dynamic_params.rs in polkadot-sdk, I do not see any storage being set for the initial values (it fallbacks to the defaults when storage is not present). Instead we should get the length from T::RuntimeParameters::default(), because the storage will be empty in the benchmarks.

polkadot-sdk/substrate/frame/support/procedural/src/dynamic_params.rs

Line 345 in ad86209

impl #scrate::__private::Get<#value_types> for #key_names {

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I do not see any insert for the initial values

We don't need to insert initial values in production, only in benchmark setup (for the on_initialize benchmark scenario that still need to be added in this PR)

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I still do not agree with the need for a on_initialize hook here. Also Parameters::<T>::iter() will be empty until set_parameter is called.

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Not all parameter usage is captured by our benchmarks. For instance, some parameters may be read within xcm or in other unaccounted areas. As a result, we can't rely solely on benchmark coverage to determine parameter impact.
To mitigate potential issues, we should assume that all parameters stored in each block will be read.

This approach helps us avoid hitting the proof size limit and prevents our chain from stalling, which would otherwise require recovery through relay chain governance.

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Parameters::<T>::iter() initially will be empty, but as we add more and more parameters it will report all the stored ones


Weight::zero().saturating_add(T::DbWeight::get().reads(items))
}
}

#[pallet::event]
#[pallet::generate_deposit(pub(crate) fn deposit_event)]
pub enum Event<T: Config> {
Expand All @@ -184,7 +193,12 @@ pub mod pallet {
}

/// Stored parameters.
///
/// ## Storage Whitelist
/// Since we account for all parameters read weight for each block,
/// don't double count it in other pallet benchmarks
#[pallet::storage]
#[pallet::whitelist_storage]
pub type Parameters<T: Config> =
StorageMap<_, Blake2_128Concat, KeyOf<T>, ValueOf<T>, OptionQuery>;

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