fix: convert getStateV2 response to Buffer without memory copy - #6687
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Performance Report✔️ no performance regression detected Full benchmark results
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Additional details and impacted files@@ Coverage Diff @@
## unstable #6687 +/- ##
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Coverage 61.80% 61.80%
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Files 556 556
Lines 59103 59103
Branches 1898 1898
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Hits 36526 36526
Misses 22534 22534
Partials 43 43 |
wemeetagain
approved these changes
Apr 18, 2024
twoeths
approved these changes
Apr 19, 2024
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🎉 This PR is included in v1.18.0 🎉 |
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Motivation
Improve fetching state as SSZ response, and reduce memory increase per request.
Currently we copy the underlying
ArrayBufferwhen converting the serialized state (Uint8Array) to aBufferwhen returning it in the response.The Buffer conversion is required by Fastify but newer versions will do this internally in an efficient way already, so we can even just return the
Uint8Arrayin the handler.Description
Convert
getStateV2response toBufferwithout memory copyBenchmarks
From unstable...nflaig/bench-buffer-from
This should also reduce GC after fetching state but don't have good metrics to showcase here.
We generally might also wanna review our usage of
Buffer.from, e.g. here it's not quite clear why we even convert to Bufferlodestar/packages/validator/src/slashingProtection/block/blockBySlotRepository.ts
Line 57 in 252fd2f
Or if we know it safe to not copy memory as it won't be mutated further, we can just convert to Buffer without memory copy.