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sc-executor-wasmtime: leverage shared host functions #8252
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I9-optimisation
An enhancement to provide better overall performance in terms of time-to-completion for a task.
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At the moment of writing, wasmtime is about to introduce a concept of shared host functions,
bytecodealliance/rfcs#9
bytecodealliance/wasmtime#2625
This would allow us to not redefine the entire Substrate Runtime Interface upon each
WasmModuleinstantiation. While it's not important for the substrate path it may be useful for PVF execution, since there we may execute a lot of short lived instances with the same interface.See also #8251 for a prerequisite refactoring and #8153
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