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rpc-keyed harness: record sub-millisecond latency without truncation #1128

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Merged
Flotapponnier merged 1 commit into from
Jul 12, 2026
Merged

rpc-keyed harness: record sub-millisecond latency without truncation #1128

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10 changes: 9 additions & 1 deletion harnesses/rpc-keyed-latency/cmd/script/probe.go
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Original file line number Diff line number Diff line change
Expand Up @@ -127,7 +127,15 @@ func doPost(ctx context.Context, url string, body []byte) (raw []byte, latencyMs

start := time.Now()
resp, err := client.Do(req)
latencyMs = float64(time.Since(start).Milliseconds())
// Use nanoseconds and convert to a float millisecond so sub-1ms probes
// are recorded with real precision. time.Duration.Milliseconds() is an
// int64 and truncates every measurement under 1 ms to zero, which
// systematically under-reports latency for providers whose endpoint
// is peer-adjacent to the harness (e.g. QuickNode via the Mobula
// shared fleet: sub-millisecond round-trips truncated to 0 dragged
// the 24h aggregate down to a nonsensical 0 ms on the BNB + US-East
// cell, then rendered as "QuickNode leads at 0 ms" on the UI).
latencyMs = float64(time.Since(start).Nanoseconds()) / 1e6
if err != nil {
if ctx.Err() != nil || strings.Contains(err.Error(), "deadline exceeded") || strings.Contains(err.Error(), "Timeout") {
return nil, latencyMs, "timeout", err
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