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perf: eliminate per-message allocations in pub/sub hot path and coalesce outbound writes

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Pub/sub 1:1 (16B) improved from 0.18x to 0.50x, fan-out from 0.18x to 0.44x,
and JetStream durable fetch from 0.13x to 0.64x vs Go. Key changes: replace
.ToArray() copy in SendMessage with pooled buffer handoff, batch multiple small
writes into single WriteAsync via 64KB coalesce buffer in write loop, and remove
profiling Stopwatch instrumentation from ProcessMessage/StreamManager hot paths.
This commit is contained in:
Joseph Doherty
2026-03-13 05:09:36 -04:00
parent 9e0df9b3d7
commit 0a4e7a822f
10 changed files with 654 additions and 232 deletions
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tests/NATS.Server.JetStream.Tests/NATS.Server.JetStream.Tests.csproj
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@@ -8,6 +8,7 @@
<PackageReference Include="coverlet.collector" />
<PackageReference Include="Microsoft.NET.Test.Sdk" />
<PackageReference Include="NATS.Client.Core" />
<PackageReference Include="NATS.Client.JetStream" />
<PackageReference Include="NSubstitute" />
<PackageReference Include="Shouldly" />
<PackageReference Include="xunit" />