Bug 20960 – -profile=gc does not track class objects allocated with new

Building dmd itself with -profile=gc and then running it on a few simple files seems to show that only array allocations are traced, but not allocations of individual objects. dmd allocates many nodes for syntax elements, and their allocation would be interesting to trace.

Try using dmd -lowmem. Without this flag dmd will not use the GC.

Built dmd with -profile=gc -lowmem, no avail. Individual allocations of class objects are not present in the log.

(In reply to Andrei Alexandrescu from comment #2) > Built dmd with -profile=gc -lowmem, no avail. Individual allocations of > class objects are not present in the log. Build with -profile=gc. *Run* with -lowmem :) Excerpt from a log: 524032 2047 dmd.mtype.TypeIdentifier dmd.parse.Parser!(ASTCodegen).Parser.parseBasicType dmd/parse.d:3725 479872 1304 dmd.dscope.Scope dmd.dscope.Scope.alloc dmd/dscope.d:154 377808 463 dmd.func.FuncDeclaration dmd.parse.Parser!(ASTCodegen).Parser.parseDeclarations dmd/parse.d:4778 162528 3386 dmd.expression.IdentifierExp dmd.parse.Parser!(ASTCodegen).Parser.parsePrimaryExp dmd/parse.d:7679 138752 271 dmd.dtemplate.TemplateInstance dmd.parse.Parser!(ASTCodegen).Parser.parsePrimaryExp dmd/parse.d:7675 124384 338 dmd.declaration.VarDeclaration dmd.parse.Parser!(ASTCodegen).Parser.parseDeclarations dmd/parse.d:4830 118528 463 dmd.mtype.TypeFunction dmd.parse.Parser!(ASTCodegen).Parser.parseDeclarator dmd/parse.d:4172 107456 292 dmd.declaration.VarDeclaration dmd.parse.Parser!(ASTCodegen).Parser.parseAutoDeclarations dmd/parse.d:1265 102816 126 dmd.func.UnitTestDeclaration dmd.parse.Parser!(ASTCodegen).Parser.parseDeclDefs dmd/parse.d:663 97152 1012 dmd.tokens.Token dmd.lexer.Lexer.allocateToken dmd/lexer.d:299

(In reply to Stanislav Blinov from comment #3) > (In reply to Andrei Alexandrescu from comment #2) > > Built dmd with -profile=gc -lowmem, no avail. Individual allocations of > > class objects are not present in the log. > > Build with -profile=gc. *Run* with -lowmem :) Awesome, thanks! I finally got it going. I will then close this.