Joseph Doherty
e9e44a9ef0
The WP-4 runs measured the stream path only up to the bounded send channel; the probe deliberately substituted the socket hop with a controllable reader, which is exactly where the R2 SiteStreamEventBatcher lives — so batching had never been in any benchmark's hot path. The harness now also attaches per-site wire probes: a real Kestrel h2c listener hosting the production SiteStreamGrpcServer, dialed by the production SiteStreamGrpcClient with batching negotiated, batch sizes read from the production batch_size histogram via a MeterListener (--wire-probes-per-site, default 10; 0 restores the old shape). Full-scale run (10x500x75, 20-min window, results doc §8 + raw JSON): 899,807 events in 12,462 frames (mean 72.2 ev/frame, p50=p99=75), wire P99 43.4 ms vs the 250 ms budget — every batch pays the full 25 ms linger since a 75-event burst never hits the 100 cap — zero drops, zero faults, offered load 100.0% of nominal with fan-out doubled. CI smoke Fact now asserts the wire path carries traffic and observes frames.
55 lines
2.2 KiB
C#
55 lines
2.2 KiB
C#
using System.Text.Json;
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using ZB.MOM.WW.ScadaBridge.LoadHarness;
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// Target-scale load harness (Phase-8 WP-4 / deferred-work register #25 + row 50).
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//
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// Full-scale protocol run (the WP-4 numbers):
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// dotnet run -c Release --project tests/ZB.MOM.WW.ScadaBridge.LoadHarness -- \
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// --sustain-minutes 20 --results loadharness-results.json
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//
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// Full 1-hour version, unchanged in every other respect:
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// ... -- --sustain-minutes 60 --results loadharness-results-1h.json
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//
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// Scaled-down smoke (what the CI [Fact] runs):
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// ... -- --sites 2 --instances-per-site 10 --tags-per-instance 5 \
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// --settle-minutes 0.1 --sustain-minutes 0.2 --sample-seconds 2 \
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// --sf-drain-messages 200 --slow-subscriber-events 2000
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var config = HarnessConfig.Parse(args);
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Console.WriteLine("ScadaBridge target-scale load harness");
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Console.WriteLine($" sites {config.Sites}");
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Console.WriteLine($" instances/site {config.InstancesPerSite}");
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Console.WriteLine($" tags/instance {config.TagsPerInstance}");
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Console.WriteLine($" total subscriptions {config.TotalSubscriptions:N0}");
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Console.WriteLine($" stream probes/site {config.StreamProbesPerSite} in-process + {config.WireProbesPerSite} wire (real gRPC)");
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Console.WriteLine($" nominal update rate {config.NominalUpdatesPerSecond:N0}/s");
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Console.WriteLine($" settle / sustain {config.SettleDuration.TotalMinutes:F1} / {config.SustainDuration.TotalMinutes:F1} min");
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Console.WriteLine();
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using var cancellation = new CancellationTokenSource();
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Console.CancelKeyPress += (_, e) =>
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{
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e.Cancel = true;
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cancellation.Cancel();
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};
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try
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{
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var result = await HarnessRun.ExecuteAsync(config, Console.WriteLine, cancellation.Token);
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var json = JsonSerializer.Serialize(result, new JsonSerializerOptions { WriteIndented = true });
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await File.WriteAllTextAsync(config.ResultsPath, json, cancellation.Token);
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Console.WriteLine();
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Console.WriteLine(ResultsFormatter.Format(result));
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Console.WriteLine();
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Console.WriteLine($"JSON metrics written to {Path.GetFullPath(config.ResultsPath)}");
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return 0;
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}
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catch (OperationCanceledException)
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{
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Console.Error.WriteLine("Run cancelled.");
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return 130;
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}
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