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61d3492598
Co-authored-by: Tyler Longwell <tlongwell@block.xyz> Signed-off-by: Tyler Longwell <tlongwell@block.xyz>
31 lines
1.4 KiB
Markdown
31 lines
1.4 KiB
Markdown
# Buzz relay bus scaling harness
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This harness gives reproducible evidence for the rewrite's Redis fan-out scaling claim:
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- **old/global bus:** every relay pod receives every community's event;
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- **new/community-scoped bus:** each pod retains only the server-resolved community topics for which it has local subscribers (`buzz:{community_id}:global` or `buzz:{community_id}:channel:{channel_id}`).
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Run:
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```bash
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./perf/relay_bus_scaling.py
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```
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Baseline scenario used for the PR summary:
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```text
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64 communities × 100 events/s, one subscribed community, all pods interested in that community
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```
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Current output:
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| pods | old global cluster ingress/s | old avg pod ingress/s | new scoped cluster ingress/s | new avg pod ingress/s | reduction | old irrelevant/pod | new irrelevant/pod |
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|---:|---:|---:|---:|---:|---:|---:|---:|
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| 1 | 6,400 | 6,400 | 100 | 100 | 64.0× | 98.44% | 0.00% |
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| 2 | 12,800 | 6,400 | 200 | 100 | 64.0× | 98.44% | 0.00% |
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| 4 | 25,600 | 6,400 | 400 | 100 | 64.0× | 98.44% | 0.00% |
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The code path this corresponds to is `buzz_pubsub::EventTopicKey::redis_channel()` (`crates/buzz-pubsub/src/topic.rs`), with `retain_topic` / `release_topic` driving dynamic local Redis `SUBSCRIBE` interest.
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This isolates the bus-bound scaling property. Live relay latency, DB capacity, and client rendering should be measured separately with a full stack because they include unrelated bottlenecks.
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