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Don't clone values when calculating storage root (#6108)

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* Don't clone values when calculating storage root

Instead of cloning all the keys and values of the overlay when
calculating the storage root, we pass all the values by reference. This
should probably bring some performance improvements when calculating the
storage root.

* no cow version (#6113)

Co-authored-by: cheme <emericchevalier.pro@gmail.com>
This commit is contained in:
Bastian Köcher
2020-05-23 11:28:34 +02:00
committed by GitHub
parent 40f3c7348e
commit 82a832bc3a
12 changed files with 165 additions and 187 deletions
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substrate/primitives/state-machine/src/basic.rs
+1 -1
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@@ -295,7 +295,7 @@ impl Externalities for BasicExternalities {
child_info: &ChildInfo,
) -> Vec<u8> {
if let Some(child) = self.inner.children_default.get(child_info.storage_key()) {
let delta = child.data.clone().into_iter().map(|(k, v)| (k, Some(v)));
let delta = child.data.iter().map(|(k, v)| (k.as_ref(), Some(v.as_ref())));
crate::in_memory_backend::new_in_mem::<Blake2Hasher>()
.child_storage_root(&child.child_info, delta).0
} else {