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Daniel Savu b643fba90a feat: use multiple `mpsc` channels instead of `broadcast` for async interface (#4190) ... ### Description Follow up to https://github.com/hyperlane-xyz/hyperlane-monorepo/pull/4180 Lowers txid broadcast channel capacity from 1M to 30k and refactors it to use a vec of `mpsc` under the hood. ### Context The heap profiler showed that each new chain takes up 100MB of memory because of the txid broadcast channel. In addition to this, the tokio broadcast channel is a ring buffer where new items simply overwrite old items, making it hard to safely lower the capacity. As such, to be able to safely lower the capacity of this channel, usage of `tokio`'s `broadcast` channel is replaced with a `Vec` of `mpsc`s, which offer an async `send` interface for backpressure. So instead of overwriting old items, senders will block on sends, which makes sense in our case as we absolutely don't want to miss items. The submitter is slower than the indexer based on empirical observation, so blocking on channel size doesn't bottleneck throughput. I noticed the max number of channel items we can reach is 29k, by running the RC relayer after an 8 day break, during which around 160k messages were submitted. Lowering the capacity to 30k should cause us to only encounter backpressure in very rare cases, and the footprint of this channel would lower from 100MB to 3MB. ### Drive-by changes The delivery indexer in the scraper is no longer passed a txid receiver, since message deliveries are not expected to occur in the same tx as message dispatches. ### Related issues - Fixes https://github.com/hyperlane-xyz/issues/issues/1293 ### Testing E2E, by adding invariants to make sure txid indexing works --------- Co-authored-by: Trevor Porter <tkporter4@gmail.com>		4 months ago
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.cargo	feat: Relayer tokio task instrumentation (#3760)	7 months ago
src	feat: use multiple `mpsc` channels instead of `broadcast` for async interface (#4190)	4 months ago
Cargo.toml	feat: Relayer heap profiling (#4180)	4 months ago