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zeekay
1775ee8ff1
backend_auto.go used to auto-select CppEVM when a GPU was detected
("parallel backend: GPU detected, backend=cevm, gpu=Metal"). But
cevmExecutor.ExecuteTransaction returned (nil, nil) — every tx fell
through to Go EVM regardless. The "GPU acceleration" log line was
misleading; the real path was always Go EVM.
Per LP-108 "one and one only": collapsed auto-select to GoEVM. The
GPU presence is still detected and logged honestly:
parallel backend: Go EVM (Block-STM across all cores)
cores=10 gpu_status="Metal (detected; cevm dispatch wiring
pending — runs Go EVM)"
To re-enable CppEVM auto-selection, the per-tx → batched-block
adapter in backend_cevm.go::ExecuteTransaction must be completed
AND a parity test against Go EVM Block-STM must pass.
Documented the gap in backend_cevm.go and backend_revm.go executor
comments. The (nil, nil) return is the documented "this backend
declines; use Go EVM" contract that the parallel framework's
DefaultTransactionExecutor expects (parallel.go:107).
Build verified: CGO_ENABLED=0 go build ./core/parallel/... clean.
Reference cevm bridge that needs wiring:
github.com/luxfi/chains/evm/cevm/cevm_cgo.go::ExecuteBlock
takes []Transaction (block-batch), TransactionExecutor is per-tx;
adapter must accumulate per-tx work and submit at block close.
This is the production-wiring counterpart to LP-108 Phase 4 vapor
deletion. The "GPU EVM is plumbed" claim is now contingent on the
adapter, not on ambient registration.