feat: [EXC-1783] No execution overhead on low cycles#10096
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alin-at-dfinity merged 3 commits intoMay 6, 2026
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When a message execution is skipped due to low cycle balance, don't deduct the message execution overhead from the round instruction limit. The instruction overhead is intended to account for entering and exiting the sandbox, which does not apply here.
alin-at-dfinity
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May 5, 2026
schneiderstefan
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May 6, 2026
…em generated reject responses, having executed zero Wasm instructions.
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…finity#10096)" (dfinity#10218) This temporarily reverts commit dc3040c. That change introduced a potential issue with the OnLowWasmMemory hook. Until we find the most appropriate fix that retains the intended semantics, revert to the previous behavior.
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When a message execution is skipped due to low cycle balance, don't deduct the message execution overhead from the round instruction limit. The instruction overhead is intended to account for entering and exiting the sandbox, which does not apply here.
This will allow the "execution" of arbitrarily many messages per round on frozen (or close to frozen) canisters, which could drive up round duration. However, there are a lot of other limits in place (ingress messages in blocks, canister call fees, queue sizes) that make this a non-issue. Particularly given that the overhead for skipping a message execution is at least an order of magnitude lower than that of executing one.