efiten and Claude Opus 5.5
efd2aeabb4
perf(neighbors): rebuild the neighbor graph only in the background ( #2221 ) ( #2222 )
...
Fixes #2221 .
## Problem
`getNeighborGraph` rebuilt `Server.neighborGraph` on the request
goroutine once it passed its 5 min TTL. It held `neighborMu` for the
whole build, which takes 11.1-11.4 s on a production store.
The 5 min recomputer went through the same staleness check. A tick that
landed just before the TTL skipped the rebuild and left it to the next
request. As a result `/api/nodes/{pubkey}/neighbors` ran at p95 10.4 s
and max 11.0 s (57 requests).
## Change
- **`getNeighborGraph`** serves the current graph. It builds only when
there is none yet, which happens at startup.
- **`rebuildNeighborGraph`** builds from the packet store whatever the
age of the current graph, outside `neighborMu`, and then swaps the
pointer.
- `recomputeNeighborGraphCache` calls it first on every tick.
- Without a store it keeps the current graph, so tests that inject a
graph are unaffected.
- **`neighborBuildMu`** serializes builds, so a startup request and the
first tick do not both build.
Freshness is now bounded by the recompute interval
(`neighborGraph.cacheRecomputeIntervalSeconds`, default 5 min) plus one
build. Before this change it was the 5 min TTL plus one build, whatever
the interval. So the bound is the same only at the default 300:
- with a longer interval (for example 3600), `/api/nodes/{pk}/neighbors`
can serve a graph up to that old, where before it was about 5 min;
- with a shorter interval (for example 30), every tick does a full
build, where before there was at most one build per 5 min.
The config comment and `config.example.json` now say this (commit
`de7ae981`).
`IsStale`/`neighborGraphTTL` stay, because `path_inspect.go` still uses
them for `store.graph`.
## Perf
- **Request path:** after the first build it does no build at all. It
takes one mutex and reads one pointer.
- **Background:** the recompute tick now always builds, once every 5
min. Before, it built only on the ticks that found the graph stale, and
a request built in the other cases.
- **Total:** the number of builds stays about the same.
Before: `/api/perf` on production shows p95 10404 ms. After: the
follow-up comment gives client-side curl timings from staging (40
requests, p95 0.204 s), not `/api/perf`. Staging builds the graph in
1.03 s against 11 s on production, so the two are different instances.
## Tests
`neighbor_graph_rebuild_test.go`:
- a stale graph is served without a rebuild;
- a graph is built when there is none yet;
- a recompute tick replaces a graph that is not yet stale;
- a recompute without a store keeps the injected graph.
The first and third tests fail on master. `go vet` and `go test .` pass
in `cmd/server`, and `-race` passes on the neighbor-graph tests.
No frontend change.
---------
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com >
2026-10-21 12:17:37 +02:00
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