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perf: Remove unneeded GetKey calls to the LRU cache #890

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merged 2 commits into from
Mar 5, 2024

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ValarDragon
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Remove some extra GetKey calls within the LRU cache code. GetKey calls took 1.5s on an Osmosis 2000 block long block sync. This PR should shave off .45s of that.

Though ideally we get the LRU code rethought / adapted more, to make it generally lower overhead. (Its currently 13.5 s on a 2000 block sync!)

@ValarDragon ValarDragon requested a review from a team as a code owner February 25, 2024 01:08
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coderabbitai bot commented Feb 25, 2024

Walkthrough

The recent modifications enhance the efficiency and readability of the caching mechanism within the cache.go file. By introducing local variables to store string representations of keys before operations, the Add and Remove methods now offer clearer and potentially more performant key handling. Furthermore, the addition of a removeWithKey method simplifies the removal process by allowing direct key-based cache element deletion, streamlining cache management.

Changes

File Path Change Summary
cache/cache.go - Add method stores key's string representation in a local variable before checking existence.
- Remove method uses a local variable for key's string representation before operations.
- Added removeWithKey method for direct key-based removal.

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@ValarDragon ValarDragon changed the title perf: Remove unneeded calls to the LRU cache perf: Remove unneeded GetKey calls to the LRU cache Feb 26, 2024
@tac0turtle tac0turtle enabled auto-merge (squash) March 5, 2024 17:51
@tac0turtle tac0turtle merged commit 4d6fc7b into master Mar 5, 2024
7 checks passed
@tac0turtle tac0turtle deleted the dev/minor_cache_speedup branch March 5, 2024 17:55
@tac0turtle
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@Mergifyio backport release/v1.x.x

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mergify bot commented Mar 5, 2024

backport release/v1.x.x

✅ Backports have been created

mergify bot pushed a commit that referenced this pull request Mar 5, 2024
Co-authored-by: Marko <marbar3778@yahoo.com>
(cherry picked from commit 4d6fc7b)
tac0turtle pushed a commit that referenced this pull request Mar 5, 2024
…899)

Co-authored-by: Dev Ojha <ValarDragon@users.noreply.github.com>
@odeke-em
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@ValarDragon this isn't fully the correct optimization despite eliminating the extra call to node.Key() while then also keep the original intended optimization or zero byteslice->string conversion in the case of already existing keys when looking im the map. In short it now it incurs the byteslice->string conversion in all cases, but could have been faster if it had been:

key := node.GetKey()
if value, ok := c.dict[string(key)]; ok {
   ...
}

c.dict[string(key)] = value

if elem, exists := c.dict[string(key)]; exists {
return c.remove(elem)
keyS := string(key)
if elem, exists := c.dict[keyS]; exists {
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This undoes the zero byteslice->string Go map lookup optimization.

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Oh wow, didn't know about this compiler optimization.

odeke-em added a commit to orijtech/iavl that referenced this pull request Mar 13, 2024
…zation

This change brings back an optimization that go innocently removed
while trying to reduce the number of invocations to node.GetKey()
in PR cosmos#890.

The Go compiler considers the special case of lookups per:

    value, ok := map[string(byteslice)]
or
    value := map[string(byteslice)]

and performs a zero byteslice->string conversion because it knows
that there is no storing in the map hence a read-only usage of
the byteslice's memory.
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5 participants