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perf(guest): read the private input zero-copy via ef_io::read_input #886

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perf(guest): read the private input zero-copy via ef_io::read_input #886

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perf(guest): read the private input zero-copy via ef_io::read_input
diegokingston Jul 31, 2026
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Merge branch 'main' into perf/guest-zerocopy
diegokingston Aug 2, 2026
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12 changes: 10 additions & 2 deletions executor/programs/rust/ethrex/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -5,8 +5,16 @@ use lambda_vm_ethrex_crypto::LambdaVmEcsmCrypto;
use rkyv::rancor::Error;

pub fn main() {
let input = lambda_vm_syscalls::syscalls::get_private_input();
let input = rkyv::from_bytes::<ProgramInput, Error>(&input).unwrap();
// Zero-copy private input: `ef_io::read_input` returns a pointer+len into
// the memory-mapped input region (host pre-loads it before execution), so
// rkyv deserializes straight from the input. `get_private_input()` would
// `to_vec()` the whole input first — a full extra copy plus one large
// allocation (~52k cycles on a 20-tx block).
let mut input_ptr: *const u8 = core::ptr::null();
let mut input_len: usize = 0;
unsafe { lambda_vm_syscalls::ef_io::read_input(&mut input_ptr, &mut input_len) };
let input = unsafe { core::slice::from_raw_parts(input_ptr, input_len) };
let input = rkyv::from_bytes::<ProgramInput, Error>(input).unwrap();
// LambdaVM crypto provider, defined in the lambda_vm repo and injected here
// (so crypto changes don't require an ethrex PR — see `crypto/ethrex-crypto`).
// It accelerates trait-routed `keccak256` (via the keccak_permute precompile)
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