perf: Speedup coins.Sort() when coins is of length 1 #18875
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Coins.Sort() performs a heap allocation, even though sort.Sort() is in place.
This is because the compiler is doing {something} called runtime.convTSlice which internally makes a copy of the entire slice.
We should ideally find a solution that avoids this malloc for every Coins.Sort() of all sizes, but just eliminating it for slices of length <= 1 is already a big win, as Sort's are used throughout the Add and Sub logic.
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Pprof before for a load in osmosis that led to sorts size 1 coins: |
julienrbrt
added
backport/v0.47.x
(cherry picked from commit bd04173) # Conflicts: # CHANGELOG.md
(cherry picked from commit bd04173) # Conflicts: # CHANGELOG.md
#18877) Co-authored-by: Dev Ojha <[email protected]> Co-authored-by: Julien Robert <[email protected]>
#18878) Co-authored-by: Dev Ojha <[email protected]> Co-authored-by: Julien Robert <[email protected]>
…#18875) (cosmos#18878) Co-authored-by: Dev Ojha <[email protected]> Co-authored-by: Julien Robert <[email protected]>
…#18875) (cosmos#18878) Co-authored-by: Dev Ojha <[email protected]> Co-authored-by: Julien Robert <[email protected]>
Coins.Sort() performs a heap allocation, even though sort.Sort() is in place.
This is because the compiler is doing {something} called runtime.convTSlice which internally makes a copy of the entire slice.
We should ideally find a solution that avoids this malloc for every Coins.Sort() of all sizes, but just eliminating it for slices of length <= 1 is already a big win, as Sort's are used throughout the Add and Sub logic.
(At least its a 2 second CPU savings win in Osmosis epoch code)
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