Reduce excess memory usage in TransparentCompiler

docs/release-notes/.FSharp.Compiler.Service/9.0.200.md

@@ -15,6 +15,7 @@
 * Fix locals allocating for the special `copyOfStruct` defensive copy ([PR #18025](https://github.com/dotnet/fsharp/pull/18025))
 * Fix lowering of computed array expressions when the expression consists of a simple mapping from a `uint64` or `unativeint` array. [PR #18081](https://github.com/dotnet/fsharp/pull/18081)
 * Add missing nullable-metadata for C# consumers of records,exceptions and DU subtypes generated from F# code. [PR #18079](https://github.com/dotnet/fsharp/pull/18079)
+* Reduce excess memory usage in TransparentCompiler. [PR #17543](https://github.com/dotnet/fsharp/pull/17543)
 
 
 ### Added

src/Compiler/Service/FSharpProjectSnapshot.fs

@@ -747,26 +747,35 @@ and [<Experimental("This FCS API is experimental and subject to change.")>] FSha
 
         FSharpProjectSnapshot.FromOptions(options, getFileSnapshot)
 
-let rec internal snapshotToOptions (projectSnapshot: ProjectSnapshotBase<_>) =
-    {
-        ProjectFileName = projectSnapshot.ProjectFileName
-        ProjectId = projectSnapshot.ProjectId
-        SourceFiles = projectSnapshot.SourceFiles |> Seq.map (fun x -> x.FileName) |> Seq.toArray
-        OtherOptions = projectSnapshot.CommandLineOptions |> List.toArray
-        ReferencedProjects =
-            projectSnapshot.ReferencedProjects
-            |> Seq.map (function
-                | FSharpReference(name, opts) -> FSharpReferencedProject.FSharpReference(name, opts.ProjectSnapshot |> snapshotToOptions)
-                | PEReference(getStamp, reader) -> FSharpReferencedProject.PEReference(getStamp, reader)
-                | ILModuleReference(name, getStamp, getReader) -> FSharpReferencedProject.ILModuleReference(name, getStamp, getReader))
-            |> Seq.toArray
-        IsIncompleteTypeCheckEnvironment = projectSnapshot.IsIncompleteTypeCheckEnvironment
-        UseScriptResolutionRules = projectSnapshot.UseScriptResolutionRules
-        LoadTime = projectSnapshot.LoadTime
-        UnresolvedReferences = projectSnapshot.UnresolvedReferences
-        OriginalLoadReferences = projectSnapshot.OriginalLoadReferences
-        Stamp = projectSnapshot.Stamp
-    }
+let internal snapshotTable =
+    ConditionalWeakTable<ProjectSnapshot, FSharpProjectOptions>()
+
+let rec internal snapshotToOptions (projectSnapshot: ProjectSnapshot) =
+    snapshotTable.GetValue(
+        projectSnapshot,
+        fun projectSnapshot ->
+            {
+                ProjectFileName = projectSnapshot.ProjectFileName
+                ProjectId = projectSnapshot.ProjectId
+                SourceFiles = projectSnapshot.SourceFiles |> Seq.map (fun x -> x.FileName) |> Seq.toArray
+                OtherOptions = projectSnapshot.CommandLineOptions |> List.toArray
+                ReferencedProjects =
+                    projectSnapshot.ReferencedProjects
+                    |> Seq.map (function
+                        | FSharpReference(name, opts) ->
+                            FSharpReferencedProject.FSharpReference(name, opts.ProjectSnapshot |> snapshotToOptions)
+                        | PEReference(getStamp, reader) -> FSharpReferencedProject.PEReference(getStamp, reader)
+                        | ILModuleReference(name, getStamp, getReader) ->
+                            FSharpReferencedProject.ILModuleReference(name, getStamp, getReader))
+                    |> Seq.toArray
+                IsIncompleteTypeCheckEnvironment = projectSnapshot.IsIncompleteTypeCheckEnvironment
+                UseScriptResolutionRules = projectSnapshot.UseScriptResolutionRules
+                LoadTime = projectSnapshot.LoadTime
+                UnresolvedReferences = projectSnapshot.UnresolvedReferences
+                OriginalLoadReferences = projectSnapshot.OriginalLoadReferences
+                Stamp = projectSnapshot.Stamp
+            }
+    )
 
 [<Extension>]
 type internal Extensions =

src/Compiler/Service/TransparentCompiler.fs

@@ -259,44 +259,138 @@ module private TypeCheckingGraphProcessing =
             return finalFileResults, state
         }
 
-type internal CompilerCaches(sizeFactor: int) =
+type CacheSizes =
+    {
+        ParseFileKeepStrongly: int
+        ParseFileKeepWeakly: int
+        ParseFileWithoutProjectKeepStrongly: int
+        ParseFileWithoutProjectKeepWeakly: int
+        ParseAndCheckFileInProjectKeepStrongly: int
+        ParseAndCheckFileInProjectKeepWeakly: int
+        ParseAndCheckAllFilesInProjectKeepStrongly: int
+        ParseAndCheckAllFilesInProjectKeepWeakly: int
+        ParseAndCheckProjectKeepStrongly: int
+        ParseAndCheckProjectKeepWeakly: int
+        FrameworkImportsKeepStrongly: int
+        FrameworkImportsKeepWeakly: int
+        BootstrapInfoStaticKeepStrongly: int
+        BootstrapInfoStaticKeepWeakly: int
+        BootstrapInfoKeepStrongly: int
+        BootstrapInfoKeepWeakly: int
+        TcLastFileKeepStrongly: int
+        TcLastFileKeepWeakly: int
+        TcIntermediateKeepStrongly: int
+        TcIntermediateKeepWeakly: int
+        DependencyGraphKeepStrongly: int
+        DependencyGraphKeepWeakly: int
+        ProjectExtrasKeepStrongly: int
+        ProjectExtrasKeepWeakly: int
+        AssemblyDataKeepStrongly: int
+        AssemblyDataKeepWeakly: int
+        SemanticClassificationKeepStrongly: int
+        SemanticClassificationKeepWeakly: int
+        ItemKeyStoreKeepStrongly: int
+        ItemKeyStoreKeepWeakly: int
+        ScriptClosureKeepStrongly: int
+        ScriptClosureKeepWeakly: int
+    }
+
+    static member Create sizeFactor =
+
+        {
+            ParseFileKeepStrongly = 50 * sizeFactor
+            ParseFileKeepWeakly = 20 * sizeFactor
+            ParseFileWithoutProjectKeepStrongly = 5 * sizeFactor
+            ParseFileWithoutProjectKeepWeakly = 2 * sizeFactor
+            ParseAndCheckFileInProjectKeepStrongly = sizeFactor
+            ParseAndCheckFileInProjectKeepWeakly = 2 * sizeFactor
+            ParseAndCheckAllFilesInProjectKeepStrongly = sizeFactor
+            ParseAndCheckAllFilesInProjectKeepWeakly = 2 * sizeFactor
+            ParseAndCheckProjectKeepStrongly = sizeFactor
+            ParseAndCheckProjectKeepWeakly = 2 * sizeFactor
+            FrameworkImportsKeepStrongly = sizeFactor
+            FrameworkImportsKeepWeakly = 2 * sizeFactor
+            BootstrapInfoStaticKeepStrongly = sizeFactor
+            BootstrapInfoStaticKeepWeakly = 2 * sizeFactor
+            BootstrapInfoKeepStrongly = sizeFactor
+            BootstrapInfoKeepWeakly = 2 * sizeFactor
+            TcLastFileKeepStrongly = sizeFactor
+            TcLastFileKeepWeakly = 2 * sizeFactor
+            TcIntermediateKeepStrongly = 20 * sizeFactor
+            TcIntermediateKeepWeakly = 20 * sizeFactor
+            DependencyGraphKeepStrongly = sizeFactor
+            DependencyGraphKeepWeakly = 2 * sizeFactor
+            ProjectExtrasKeepStrongly = sizeFactor
+            ProjectExtrasKeepWeakly = 2 * sizeFactor
+            AssemblyDataKeepStrongly = sizeFactor
+            AssemblyDataKeepWeakly = 2 * sizeFactor
+            SemanticClassificationKeepStrongly = sizeFactor
+            SemanticClassificationKeepWeakly = 2 * sizeFactor
+            ItemKeyStoreKeepStrongly = sizeFactor
+            ItemKeyStoreKeepWeakly = 2 * sizeFactor
+            ScriptClosureKeepStrongly = sizeFactor
+            ScriptClosureKeepWeakly = 2 * sizeFactor
+        }
+
+    static member Default =
+        let sizeFactor = 100
+        CacheSizes.Create sizeFactor
+
+type internal CompilerCaches(sizeFactor: CacheSizes) =
 
     let sf = sizeFactor
 
-    member _.SizeFactor = sf
+    member _.CacheSizes = sf
 
-    member val ParseFile = AsyncMemoize(keepStrongly = 50 * sf, keepWeakly = 20 * sf, name = "ParseFile")
+    member val ParseFile = AsyncMemoize(keepStrongly = sf.ParseFileKeepStrongly, keepWeakly = sf.ParseFileKeepWeakly, name = "ParseFile")
 
     member val ParseFileWithoutProject =
-        AsyncMemoize<string, string, FSharpParseFileResults>(keepStrongly = 5 * sf, keepWeakly = 2 * sf, name = "ParseFileWithoutProject")
+        AsyncMemoize<string, string, FSharpParseFileResults>(
+            sf.ParseFileWithoutProjectKeepStrongly,
+            keepWeakly = sf.ParseFileWithoutProjectKeepWeakly,
+            name = "ParseFileWithoutProject"
+        )
 
-    member val ParseAndCheckFileInProject = AsyncMemoize(sf, 2 * sf, name = "ParseAndCheckFileInProject")
+    member val ParseAndCheckFileInProject =
+        AsyncMemoize(
+            sf.ParseAndCheckFileInProjectKeepStrongly,
+            sf.ParseAndCheckFileInProjectKeepWeakly,
+            name = "ParseAndCheckFileInProject"
+        )
 
-    member val ParseAndCheckAllFilesInProject = AsyncMemoizeDisabled(sf, 2 * sf, name = "ParseAndCheckFullProject")
+    member val ParseAndCheckAllFilesInProject =
+        AsyncMemoizeDisabled(
+            sf.ParseAndCheckAllFilesInProjectKeepStrongly,
+            sf.ParseAndCheckAllFilesInProjectKeepWeakly,
+            name = "ParseAndCheckFullProject"
+        )
 
-    member val ParseAndCheckProject = AsyncMemoize(sf, 2 * sf, name = "ParseAndCheckProject")
+    member val ParseAndCheckProject =
+        AsyncMemoize(sf.ParseAndCheckProjectKeepStrongly, sf.ParseAndCheckProjectKeepWeakly, name = "ParseAndCheckProject")
 
-    member val FrameworkImports = AsyncMemoize(sf, 2 * sf, name = "FrameworkImports")
+    member val FrameworkImports = AsyncMemoize(sf.FrameworkImportsKeepStrongly, sf.FrameworkImportsKeepWeakly, name = "FrameworkImports")
 
-    member val BootstrapInfoStatic = AsyncMemoize(sf, 2 * sf, name = "BootstrapInfoStatic")
+    member val BootstrapInfoStatic =
+        AsyncMemoize(sf.BootstrapInfoStaticKeepStrongly, sf.BootstrapInfoStaticKeepWeakly, name = "BootstrapInfoStatic")
 
-    member val BootstrapInfo = AsyncMemoize(sf, 2 * sf, name = "BootstrapInfo")
+    member val BootstrapInfo = AsyncMemoize(sf.BootstrapInfoKeepStrongly, sf.BootstrapInfoKeepWeakly, name = "BootstrapInfo")
 
-    member val TcLastFile = AsyncMemoizeDisabled(sf, 2 * sf, name = "TcLastFile")
+    member val TcLastFile = AsyncMemoizeDisabled(sf.TcLastFileKeepStrongly, sf.TcLastFileKeepWeakly, name = "TcLastFile")
 
-    member val TcIntermediate = AsyncMemoize(20 * sf, 20 * sf, name = "TcIntermediate")
+    member val TcIntermediate = AsyncMemoize(sf.TcIntermediateKeepStrongly, sf.TcIntermediateKeepWeakly, name = "TcIntermediate")
 
-    member val DependencyGraph = AsyncMemoize(sf, 2 * sf, name = "DependencyGraph")
+    member val DependencyGraph = AsyncMemoize(sf.DependencyGraphKeepStrongly, sf.DependencyGraphKeepWeakly, name = "DependencyGraph")
 
-    member val ProjectExtras = AsyncMemoizeDisabled(sf, 2 * sf, name = "ProjectExtras")
+    member val ProjectExtras = AsyncMemoizeDisabled(sf.ProjectExtrasKeepStrongly, sf.ProjectExtrasKeepWeakly, name = "ProjectExtras")
 
-    member val AssemblyData = AsyncMemoize(sf, 2 * sf, name = "AssemblyData")
+    member val AssemblyData = AsyncMemoize(sf.AssemblyDataKeepStrongly, sf.AssemblyDataKeepWeakly, name = "AssemblyData")
 
-    member val SemanticClassification = AsyncMemoize(sf, 2 * sf, name = "SemanticClassification")
+    member val SemanticClassification =
+        AsyncMemoize(sf.SemanticClassificationKeepStrongly, sf.SemanticClassificationKeepWeakly, name = "SemanticClassification")
 
-    member val ItemKeyStore = AsyncMemoize(sf, 2 * sf, name = "ItemKeyStore")
+    member val ItemKeyStore = AsyncMemoize(sf.ItemKeyStoreKeepStrongly, sf.ItemKeyStoreKeepWeakly, name = "ItemKeyStore")
 
-    member val ScriptClosure = AsyncMemoize(sf, 2 * sf, name = "ScriptClosure")
+    member val ScriptClosure = AsyncMemoize(sf.ScriptClosureKeepStrongly, sf.ScriptClosureKeepWeakly, name = "ScriptClosure")
 
     member this.Clear(projects: Set<FSharpProjectIdentifier>) =
         let shouldClear project = projects |> Set.contains project
@@ -326,7 +420,8 @@ type internal TransparentCompiler
         parallelReferenceResolution,
         captureIdentifiersWhenParsing,
         getSource: (string -> Async<ISourceText option>) option,
-        useChangeNotifications
+        useChangeNotifications,
+        ?cacheSizes
     ) as self =
 
     let documentSource =
@@ -337,8 +432,10 @@ type internal TransparentCompiler
     // Is having just one of these ok?
     let lexResourceManager = Lexhelp.LexResourceManager()
 
+    let cacheSizes = defaultArg cacheSizes CacheSizes.Default
+
     // Mutable so we can easily clear them by creating a new instance
-    let mutable caches = CompilerCaches(100)
+    let mutable caches = CompilerCaches(cacheSizes)
 
     // TODO: do we need this?
     //let maxTypeCheckingParallelism = max 1 (Environment.ProcessorCount / 2)
@@ -1371,8 +1468,8 @@ type internal TransparentCompiler
                         node,
                         (fun tcInfo ->
 
-                            if tcInfo.stateContainsNodes |> Set.contains fileNode then
-                                failwith $"Oops!"
+                            // if tcInfo.stateContainsNodes |> Set.contains fileNode then
+                            //     failwith $"Oops!"
 
                             //if
                             //    tcInfo.stateContainsNodes
@@ -1417,14 +1514,8 @@ type internal TransparentCompiler
                         fileNode,
                         (fun tcInfo ->
 
-                            if tcInfo.stateContainsNodes |> Set.contains fileNode then
-                                failwith $"Oops!"
-
-                            // if
-                            //     tcInfo.stateContainsNodes
-                            //     |> Set.contains (NodeToTypeCheck.PhysicalFile(index + 1))
-                            // then
-                            //     failwith $"Oops!!!"
+                            // if tcInfo.stateContainsNodes |> Set.contains fileNode then
+                            //     failwith $"Oops!"
 
                             let parsedInput = projectSnapshot.SourceFiles[index].ParsedInput
                             let prefixPathOpt = None
@@ -2087,9 +2178,13 @@ type internal TransparentCompiler
 
     member _.Caches = caches
 
-    member _.SetCacheSizeFactor(sizeFactor: int) =
-        if sizeFactor <> caches.SizeFactor then
-            caches <- CompilerCaches(sizeFactor)
+    member _.SetCacheSize(cacheSize: CacheSizes) =
+        if cacheSize <> caches.CacheSizes then
+            caches <- CompilerCaches(cacheSize)
+
+    member x.SetCacheSizeFactor(sizeFactor: int) =
+        let newCacheSize = CacheSizes.Create sizeFactor
+        x.SetCacheSize newCacheSize
 
     interface IBackgroundCompiler with
 
@@ -2151,7 +2246,7 @@ type internal TransparentCompiler
 
         member _.ClearCaches() : unit =
             backgroundCompiler.ClearCaches()
-            caches <- CompilerCaches(100) // TODO: check
+            caches <- CompilerCaches(cacheSizes) // TODO: check
 
         member _.DownsizeCaches() : unit = backgroundCompiler.DownsizeCaches()
 

src/Compiler/Service/TransparentCompiler.fsi

@@ -98,9 +98,46 @@ type internal Extensions =
         fileSnapshots: #ProjectSnapshot.IFileSnapshot list * ?extraKeyFlag: DependencyGraphType ->
             ICacheKey<(DependencyGraphType option * byte array), string>
 
+[<Experimental("This FCS type is experimental and will likely change or be removed in the future.")>]
+type CacheSizes =
+    { ParseFileKeepStrongly: int
+      ParseFileKeepWeakly: int
+      ParseFileWithoutProjectKeepStrongly: int
+      ParseFileWithoutProjectKeepWeakly: int
+      ParseAndCheckFileInProjectKeepStrongly: int
+      ParseAndCheckFileInProjectKeepWeakly: int
+      ParseAndCheckAllFilesInProjectKeepStrongly: int
+      ParseAndCheckAllFilesInProjectKeepWeakly: int
+      ParseAndCheckProjectKeepStrongly: int
+      ParseAndCheckProjectKeepWeakly: int
+      FrameworkImportsKeepStrongly: int
+      FrameworkImportsKeepWeakly: int
+      BootstrapInfoStaticKeepStrongly: int
+      BootstrapInfoStaticKeepWeakly: int
+      BootstrapInfoKeepStrongly: int
+      BootstrapInfoKeepWeakly: int
+      TcLastFileKeepStrongly: int
+      TcLastFileKeepWeakly: int
+      TcIntermediateKeepStrongly: int
+      TcIntermediateKeepWeakly: int
+      DependencyGraphKeepStrongly: int
+      DependencyGraphKeepWeakly: int
+      ProjectExtrasKeepStrongly: int
+      ProjectExtrasKeepWeakly: int
+      AssemblyDataKeepStrongly: int
+      AssemblyDataKeepWeakly: int
+      SemanticClassificationKeepStrongly: int
+      SemanticClassificationKeepWeakly: int
+      ItemKeyStoreKeepStrongly: int
+      ItemKeyStoreKeepWeakly: int
+      ScriptClosureKeepStrongly: int
+      ScriptClosureKeepWeakly: int }
+
+    static member Create: sizeFactor: int -> CacheSizes
+
 type internal CompilerCaches =
 
-    new: sizeFactor: int -> CompilerCaches
+    new: sizeFactor: CacheSizes -> CompilerCaches
 
     member AssemblyData: AsyncMemoize<FSharpProjectIdentifier, (string * string), ProjectAssemblyDataResult>
 
@@ -134,7 +171,7 @@ type internal CompilerCaches =
     member SemanticClassification:
         AsyncMemoize<(string * FSharpProjectIdentifier), string, SemanticClassificationView option>
 
-    member SizeFactor: int
+    member CacheSizes: CacheSizes
 
     member TcIntermediate: AsyncMemoize<(string * FSharpProjectIdentifier), (string * int), TcIntermediate>
 
@@ -158,7 +195,8 @@ type internal TransparentCompiler =
         parallelReferenceResolution: ParallelReferenceResolution *
         captureIdentifiersWhenParsing: bool *
         getSource: (string -> Async<ISourceText option>) option *
-        useChangeNotifications: bool ->
+        useChangeNotifications: bool *
+        ?cacheSizes: CacheSizes ->
             TransparentCompiler
 
     member FindReferencesInFile:
@@ -177,6 +215,7 @@ type internal TransparentCompiler =
         fileName: string * projectSnapshot: ProjectSnapshot.ProjectSnapshot * _userOpName: 'a ->
             Async<FSharpParseFileResults>
 
+    member SetCacheSize: cacheSize: CacheSizes -> unit
     member SetCacheSizeFactor: sizeFactor: int -> unit
 
     member Caches: CompilerCaches