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Performance change of Protocols reflection in Elixir v1.11

#protocols#performance#reflection
eugene.kobil

eugene.kobil

Performance change of Protocols reflection in Elixir v1.11

Hi everyone,

I worked on some issue on my project that was related to the performance slowdown brought by Protocol impl_for/1 active usage (on Elixir v.1.10.4).

I found out that on newer elixir versions (starting from v.1.11) this issue has gone.
According to my measurements the cost of impl_for call reduced from ~70ms on v1.10.4 to < 1ms on v1.11.

I tried to find some change logs that mention this improvement or at least some specific commit in v.1.10.4…v1.11 diff but did not succeed with it.

Does anyone knows what exactly could improve impl_for performance?

Thanks

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ltd

ltd

70ms for a single impl_for lookup? something else is amiss, how are you measuring this?

1
Post #5
josevalim

josevalim

Creator of Elixir

AFAIK we didn’t change anything around this so, if I had to guess, you are having an issue with protocol consolidation on previous versions. Perhaps the protocol was not consolidated for some reason?

1
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