Poor performance on Lokathor/gl46

[lnicola]

https://github.com/Lokathor/gl46/

[lnicola]

Hover:

  128ms - handle_hover
      127ms - Semantics::analyze2
            0ms - crate_def_map:wait (2 calls)
            0ms - infer:wait (1 calls)
            0ms - module_to_def (1 calls)
          127ms - ???
        0ms - classify_name_ref (1 calls)
        0ms - crate_def_map:wait (7 calls)

Enhanced Enter:

  209ms - handle_folding_range
  229ms - handle_document_symbol
 1109ms - handle_code_lens
      267ms - SourceBinder::to_module_def
          267ms - crate_def_map:wait
              192ms - item_tree_query @ HirFileId(FileId(FileId(0)))
               75ms - ???
        0ms - SourceBinder::to_module_def (36 calls)
        4ms - crate_def_map:wait (19910 calls)
        0ms - impl_data_query (3 calls)
       11ms - module_to_def (7946 calls)
      826ms - ???
 2265ms - publish_diagnostics
     2260ms - diagnostics
          161ms - SourceBinder::to_module_def
              161ms - crate_def_map:wait
         1746ms - Module::diagnostics
               12ms - Function::diagnostics
                   12ms - infer:wait @ report_error_as_necessary_from
                       12ms - body_with_source_map_query
                            0ms - crate_def_map:wait (180 calls)
                            0ms - item_tree_query (88 calls)
                            9ms - parse_macro_query (104 calls)
               30ms - Function::diagnostics
                    0ms - infer:wait (1 calls)
                   30ms - ???
              975ms - Module::diagnostics
                   15ms - Function::diagnostics
                       14ms - infer:wait @ load_global_gl_with
                            8ms - body_with_source_map_query (1 calls)
                  959ms - Function::diagnostics (1983 calls)
                    0ms - crate_def_map:wait (3 calls)
              725ms - Module::diagnostics
                  724ms - Function::diagnostics (1986 calls)
                    0ms - crate_def_map:wait (3 calls)
                1ms - Function::diagnostics (16 calls)
                0ms - Module::diagnostics (2 calls)
                0ms - crate_def_map:wait (3 calls)
          352ms - ???
 2268ms - handle_inlay_hints
     2260ms - inlay_hints
          210ms - Semantics::analyze2
              206ms - SourceBinder::to_module_def
                  206ms - crate_def_map:wait
                0ms - body_with_source_map_query (1 calls)
                0ms - crate_def_map:wait (2 calls)
                3ms - infer:wait (1 calls)
           15ms - Semantics::analyze2
                0ms - SourceBinder::to_module_def (1 calls)
                1ms - body_with_source_map_query (1 calls)
                0ms - crate_def_map:wait (1 calls)
                0ms - infer:wait (1 calls)
               14ms - ???
          216ms - Semantics::analyze2
                0ms - crate_def_map:wait (2 calls)
                0ms - infer:wait (1 calls)
                0ms - module_to_def (1 calls)
              216ms - ???
           70ms - Semantics::analyze2
                0ms - crate_def_map:wait (2 calls)
                0ms - infer:wait (1 calls)
                0ms - module_to_def (1 calls)
               70ms - ???
          898ms - Semantics::analyze2 (34114 calls)
            0ms - crate_def_map:wait (3984 calls)
          848ms - ???

[matklad]

90% sure that we hit "resloving sytnax PTR is O(N)", cc @CAD97, this might be an interesting test case.

[lnicola]

Triage: we're still slow. The diagnostics seem to take about 800 ms in struct_loader, inlay hints take 500 ms.

[Lokathor]

I recently put out a 0.2 version of this crate and my anecdotal experience is that RA seems to be doing reasonably while I'm making a project using it. Sluggish, but largely tolerable.

[matklad]

30% sure its #6466

[Lokathor]

Wasn't that PR merged in november though?

[flodiebold]

No, it was closed without being merged.