Shuhei KadowakiandKirill Bulatov
8b2baadb09
Language server performance issues can be difficult to diagnose because request timings are not shown alongside the corresponding JSON-RPC traffic. Annotate responses in the "LSP Logs / RPC Messages" view with their end-to-end duration, making it easier to identify slow methods, latency outliers, and cancellation behavior in the language server process launched by Zed. Capture timestamps at the transport boundary, correlate decoded request IDs separately by direction, preserve timing across cancellation, bound stale request tracking, and forward host-measured durations to remote clients. ## Self-Review Checklist: - [x] I've reviewed my own diff for quality, security, and relxability - [x] Unsafe blocks (if any) have justifying comments - [x] The content adheres to Zed's UI standards ([UX/UI](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist) and [icon](https://github.com/zed-industries/zed/blob/main/crates/icons/README.md) guidelines) - [x] Tests cover the new/changed behavior - [x] Performance impact has been considered and is acceptable ## Showcase <details> <summary>Example trace</summary> ``` // Send: {"jsonrpc":"2.0","id":61,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":378,"character":3}}} // Receive (took 7.698042ms): {"jsonrpc":"2.0","id":61,"result":[]} // Send: {"jsonrpc":"2.0","id":62,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":378,"character":3},"end":{"line":378,"character":3}},"context":{"diagnostics":[]}}} // Receive (took 5.632167ms): {"jsonrpc":"2.0","id":62,"result":[{"title":"Show macro expansion for `@static`","command":{"title":"Show macro expansion for `@static`","command":"jetls.openMacroExpansion","arguments":["jetls-macro-expansion:/macro-expanded.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609"]}},{"title":"Expand all macros in this top-level form","command":{"title":"Expand all macros in this top-level form","command":"jetls.openMacroExpansion","arguments":["jetls-macro-expansion:/macro-expanded.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609&mode=toplevel"]}},{"title":"Show inferred type annotations","command":{"title":"Show inferred type annotations","command":"jetls.openTypeAnnotation","arguments":["jetls-type-annotation:/type-annotated.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609"]}}]} // Send: {"jsonrpc":"2.0","id":63,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":379,"character":3}}} // Receive (took 3.473792ms): {"jsonrpc":"2.0","id":63,"result":[]} // Send: {"jsonrpc":"2.0","id":64,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":379,"character":3},"end":{"line":379,"character":3}},"context":{"diagnostics":[]}}} // Receive (took 4.472375ms): {"jsonrpc":"2.0","id":64,"result":[{"title":"Show macro expansion for `@static`","command":{"title":"Show macro expansion for `@static`","command":"jetls.openMacroExpansion","arguments":["jetls-macro-expansion:/macro-expanded.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609"]}},{"title":"Expand all macros in this top-level form","command":{"title":"Expand all macros in this top-level form","command":"jetls.openMacroExpansion","arguments":["jetls-macro-expansion:/macro-expanded.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609&mode=toplevel"]}},{"title":"Show inferred type annotations","command":{"title":"Show inferred type annotations","command":"jetls.openTypeAnnotation","arguments":["jetls-type-annotation:/type-annotated.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=14278&stop=15609"]}}]} // Send: {"jsonrpc":"2.0","id":65,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":380,"character":0}}} // Receive (took 1.186541ms): {"jsonrpc":"2.0","id":65,"result":[]} // Send: {"jsonrpc":"2.0","id":66,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":380,"character":0},"end":{"line":380,"character":0}},"context":{"diagnostics":[]}}} // Receive (took 2.552708ms): {"jsonrpc":"2.0","id":66,"result":[]} // Send: {"jsonrpc":"2.0","id":67,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":401,"character":0}}} // Receive (took 1.490084ms): {"jsonrpc":"2.0","id":67,"result":[]} // Send: {"jsonrpc":"2.0","id":68,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":401,"character":0},"end":{"line":401,"character":0}},"context":{"diagnostics":[]}}} // Receive (took 2.819125ms): {"jsonrpc":"2.0","id":68,"result":[]} // Send: {"jsonrpc":"2.0","id":69,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":400,"character":0}}} // Receive (took 3.501375ms): {"jsonrpc":"2.0","id":69,"result":[]} // Send: {"jsonrpc":"2.0","id":70,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":399,"character":0}}} // Receive (took 2.903333ms): {"jsonrpc":"2.0","id":70,"result":[]} // Send: {"jsonrpc":"2.0","id":71,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":399,"character":14}}} // Receive (took 3.166ms): {"jsonrpc":"2.0","id":71,"result":[{"range":{"start":{"line":389,"character":19},"end":{"line":389,"character":22}},"kind":3},{"range":{"start":{"line":399,"character":11},"end":{"line":399,"character":14}},"kind":2}]} // Send: {"jsonrpc":"2.0","id":72,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":399,"character":14},"end":{"line":399,"character":14}},"context":{"diagnostics":[]}}} // Receive (took 3.169625ms): {"jsonrpc":"2.0","id":72,"result":[{"title":"Show inferred type annotations","command":{"title":"Show inferred type annotations","command":"jetls.openTypeAnnotation","arguments":["jetls-type-annotation:/type-annotated.jl?source=file%253A%252F%252F%252FUsers%252Faviatesk%252Fjulia%252Fpackages%252Fworktrees%252FJETLS%252Fplacid-wren%252FJETLS%252Fsrc%252Fanalysis%252FAnalyzer.jl&start=15676&stop=16556"]}}]} // Send: {"jsonrpc":"2.0","id":73,"method":"textDocument/hover","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":399,"character":14}}} // Receive (took 1.234396208s): {"jsonrpc":"2.0","id":73,"result":{"contents":{"kind":"markdown","value":"```julia\n(local) ret :: Compiler.RTEffects # Core.PartialStruct(Compiler.RTEffects, Any[Any, Any, Compiler.Effects, Core.Const(nothing)])\n```\n"},"range":{"start":{"line":399,"character":11},"end":{"line":399,"character":14}}}} // Send: {"jsonrpc":"2.0","id":74,"method":"textDocument/hover","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":399,"character":14}}} // Receive (took 11.429875ms): {"jsonrpc":"2.0","id":74,"result":{"contents":{"kind":"markdown","value":"```julia\n(local) ret :: Compiler.RTEffects # Core.PartialStruct(Compiler.RTEffects, Any[Any, Any, Compiler.Effects, Core.Const(nothing)])\n```\n"},"range":{"start":{"line":399,"character":11},"end":{"line":399,"character":14}}}} // Send: {"jsonrpc":"2.0","id":75,"method":"textDocument/documentHighlight","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"position":{"line":401,"character":0}}} // Receive (took 1.098667ms): {"jsonrpc":"2.0","id":75,"result":[]} // Send: {"jsonrpc":"2.0","id":76,"method":"textDocument/codeAction","params":{"textDocument":{"uri":"file:///Users/aviatesk/julia/packages/worktrees/JETLS/placid-wren/JETLS/src/analysis/Analyzer.jl"},"range":{"start":{"line":401,"character":0},"end":{"line":401,"character":0}},"context":{"diagnostics":[]}}} // Receive (took 4.117459ms): {"jsonrpc":"2.0","id":76,"result":[]} ``` </details> --- Release Notes: - Improved LSP Logs by showing request durations alongside RPC responses, making slow language server behavior easier to diagnose. --------- Co-authored-by: Kirill Bulatov <kirill@zed.dev>
Zed
Welcome to Zed, a high-performance, multiplayer code editor from the creators of Atom and Tree-sitter.
Installation
On macOS, Linux, and Windows you can download Zed directly or install Zed via your local package manager (macOS/Linux/Windows).
Other platforms are not yet available:
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Developing Zed
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