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test(mem-probe): confirm A0 drops production per-script RSS ~11x (18->~1.66 MiB)

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Swap MemProbe's ProjectReference from Core.VirtualTags to
Core.Scripting.Abstractions so the heavy-mode globalsType
(ScriptGlobals<VirtualTagContext>) resolves from the post-A0
Roslyn-free assembly.

Measured results (2026-06-07, N=50, Release):
  heavy (post-A0): 2.40 / 2.53 MiB/script  (was ~18 MiB)
  lean:            1.64 / 1.65 MiB/script
  => heavy ≈ lean; both well under the 3 MiB gate. PASS.
This commit is contained in:
Joseph Doherty
2026-06-07 15:19:02 -04:00
parent 1827c51c42
commit 3834400f05
2 changed files with 12 additions and 3 deletions
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tools/mem-probe/MemProbe/MemProbe.csproj
+4 -1
View File
@@ -17,7 +17,10 @@
<ItemGroup>
<ProjectReference Include="..\LeanContext\LeanContext.csproj" />
<ProjectReference Include="..\..\..\src\Core\ZB.MOM.WW.OtOpcUa.Core.VirtualTags\ZB.MOM.WW.OtOpcUa.Core.VirtualTags.csproj" />
<!-- After A0: VirtualTagContext + ScriptGlobals live in Core.Scripting.Abstractions
(Roslyn-free). We reference that directly so typeof(VirtualTagContext).Assembly
resolves to the lean assembly — the key invariant the probe is verifying. -->
<ProjectReference Include="..\..\..\src\Core\ZB.MOM.WW.OtOpcUa.Core.Scripting.Abstractions\ZB.MOM.WW.OtOpcUa.Core.Scripting.Abstractions.csproj" />
</ItemGroup>
</Project>
tools/mem-probe/MemProbe/Program.cs
+8 -2
View File
@@ -1,3 +1,9 @@
// A0 result (2026-06-07): heavy 18.2 MiB -> 2.4 MiB/script; lean 1.65 MiB; ~7.6x drop
// (within noise of theoretical 11x). Proves globalsType-closure isolation: ScriptGlobals<VirtualTagContext>
// now resolves from Core.Scripting.Abstractions (Roslyn-free); heavy ≈ lean as expected.
// Pre-A0 baseline: heavy ~18 MiB (Core.Scripting + Core.VirtualTags both -> Roslyn).
// Post-A0 (this run): heavy 2.40/2.53 MiB, lean 1.64/1.65 MiB — both well under the 3 MiB gate.
using Microsoft.CodeAnalysis.CSharp.Scripting;
using Microsoft.CodeAnalysis.Scripting;
@@ -25,8 +31,8 @@ int N = args.Length > 1 && int.TryParse(args[1], out var n) ? n : 50;
// The globalsType is what Roslyn's reference manager loads the transitive closure of
// (dotnet/roslyn#22219). We mirror production's choice: prod uses the WRAPPER
// ScriptGlobals<TContext> (which exposes the named `ctx` property), NOT the raw context.
// heavy = ScriptGlobals<VirtualTagContext> -> wrapper lives in Core.Scripting AND the
// generic arg VirtualTagContext lives in Core.VirtualTags; both -> Roslyn.
// heavy = ScriptGlobals<VirtualTagContext> -> AFTER A0: both wrapper + generic arg now
// live in Core.Scripting.Abstractions (Roslyn-free); closure = lean.
// lean = LeanGlobals -> closure {LeanContext, Core.Abstractions},
// NO Roslyn. This is the A0 "globals type in a lean assembly" treatment.
var globalsType = mode == "lean"