High CPU usage when pow function exists in code

[agentx3]

Issue
CPU usage increases dramatically when there is a pow function in the code. The specific process seems to be this one ../start/coc-pyright/node_modules/pyright/langserver.index.js--node-ipc--clientProcessId=xxxxxxx.

During this time, the CocAction doHover cannot be called. CPU usage can stay high for 3+ minutes before it seemingly resolves, doHover functionality is restored, and the parameter inlay hints are displayed.

Minimum reproducable steps

echo "pow(1,-1,1)" > code.py
nvim code.py

Hopefully it's not just me. May also be an upstream issue, but I'm not sure.
Afternote: Also happens with pow(1,1)

What's the output of :CocCommand pyright.version
coc-pyright 1.1.365 with Pyright 1.1.365

What's the output of :CocCommand workspace.showOutput Pyright

This was captured moments after opening the file. If I wait for it to resolve, then the output is 6000+ lines long, so I won't post it unless asked

Workspace: /home/agentx3/TEMP/pyright-test
Using python from /etc/profiles/per-user/agentx3/bin/python

[Trace - 14:49:36.461] Sending request 'initialize - (0)'.
Params: {
    "processId": 536966,
    "rootPath": "/home/agentx3/TEMP/pyright-test",
    "rootUri": "file:///home/agentx3/TEMP/pyright-test",
    "capabilities": {
        "workspace": {
            "applyEdit": true,
            "workspaceEdit": {
                "documentChanges": true,
                "resourceOperations": [
                    "create",
                    "rename",
                    "delete"
                ],
                "failureHandling": "undo",
                "normalizesLineEndings": true,
                "changeAnnotationSupport": {
                    "groupsOnLabel": false
                }
            },
            "didChangeConfiguration": {
                "dynamicRegistration": true
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            "didChangeWatchedFiles": {
                "dynamicRegistration": true,
                "relativePatternSupport": true
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            "codeLens": {
                "refreshSupport": true
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            "executeCommand": {
                "dynamicRegistration": true
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            "configuration": true,
            "fileOperations": {
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                "didCreate": true,
                "didRename": true,
                "didDelete": true,
                "willCreate": true,
                "willRename": true,
                "willDelete": true
            },
            "semanticTokens": {
                "refreshSupport": true
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            "inlayHint": {
                "refreshSupport": true
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            "inlineValue": {
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            "diagnostics": {
                "refreshSupport": true
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            "symbol": {
                "dynamicRegistration": true,
                "symbolKind": {
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            "workspaceFolders": true
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        "textDocument": {
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                "versionSupport": true,
                "tagSupport": {
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                "codeDescriptionSupport": true,
                "dataSupport": true
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            "synchronization": {
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                "willSave": true,
                "willSaveWaitUntil": true,
                "didSave": true
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            "completion": {
                "dynamicRegistration": true,
                "contextSupport": true,
                "completionItem": {
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                    "commitCharactersSupport": true,
                    "documentationFormat": [
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                    "preselectSupport": true,
                    "insertReplaceSupport": true,
                    "tagSupport": {
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                    "resolveSupport": {
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                    "labelDetailsSupport": true,
                    "insertTextModeSupport": {
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                "insertTextMode": 2,
                "completionList": {
                    "itemDefaults": [
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                        "insertTextFormat",
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            },
            "hover": {
                "dynamicRegistration": true,
                "contentFormat": [
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            },
            "signatureHelp": {
                "dynamicRegistration": true,
                "contextSupport": true,
                "signatureInformation": {
                    "documentationFormat": [
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                    "activeParameterSupport": false,
                    "parameterInformation": {
                        "labelOffsetSupport": true
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                }
            },
            "references": {
                "dynamicRegistration": true
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            "definition": {
                "dynamicRegistration": true,
                "linkSupport": true
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            "documentHighlight": {
                "dynamicRegistration": true
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            "documentSymbol": {
                "dynamicRegistration": true,
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                    ]
                },
                "hierarchicalDocumentSymbolSupport": true,
                "tagSupport": {
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            "codeAction": {
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                "isPreferredSupport": true,
                "disabledSupport": true,
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                "honorsChangeAnnotations": false,
                "resolveSupport": {
                    "properties": [
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                "codeActionLiteralSupport": {
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                    }
                }
            },
            "codeLens": {
                "dynamicRegistration": true
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            "formatting": {
                "dynamicRegistration": true
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            "rangeFormatting": {
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                "honorsChangeAnnotations": true,
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            "documentLink": {
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                "tooltipSupport": true
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            "typeDefinition": {
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                "linkSupport": true
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            "declaration": {
                "dynamicRegistration": true,
                "linkSupport": true
            },
            "colorProvider": {
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            },
            "foldingRange": {
                "dynamicRegistration": true,
                "rangeLimit": 5000,
                "lineFoldingOnly": true,
                "foldingRangeKind": {
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                },
                "foldingRange": {
                    "collapsedText": false
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            "selectionRange": {
                "dynamicRegistration": true
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            "callHierarchy": {
                "dynamicRegistration": true
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            "linkedEditingRange": {
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            "semanticTokens": {
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                    "enumMember",
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                "tokenModifiers": [
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                    "defaultLibrary"
                ],
                "formats": [
                    "relative"
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                "requests": {
                    "range": true,
                    "full": {
                        "delta": true
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                },
                "multilineTokenSupport": false,
                "overlappingTokenSupport": false,
                "serverCancelSupport": true,
                "augmentsSyntaxTokens": true
            },
            "inlayHint": {
                "dynamicRegistration": true,
                "resolveSupport": {
                    "properties": [
                        "tooltip",
                        "textEdits",
                        "label.tooltip",
                        "label.location",
                        "label.command"
                    ]
                }
            },
            "inlineValue": {
                "dynamicRegistration": true
            },
            "diagnostic": {
                "dynamicRegistration": true,
                "relatedDocumentSupport": true
            },
            "typeHierarchy": {
                "dynamicRegistration": true
            }
        },
        "window": {
            "showMessage": {
                "messageActionItem": {
                    "additionalPropertiesSupport": true
                }
            },
            "showDocument": {
                "support": true
            },
            "workDoneProgress": true
        },
        "general": {
            "regularExpressions": {
                "engine": "ECMAScript",
                "version": "ES2020"
            },
            "markdown": {
                "parser": "marked",
                "version": "7.0.5"
            },
            "positionEncodings": [
                "utf-16"
            ],
            "staleRequestSupport": {
                "cancel": true,
                "retryOnContentModified": [
                    "textDocument/inlayHint",
                    "textDocument/semanticTokens/full",
                    "textDocument/semanticTokens/range",
                    "textDocument/semanticTokens/full/delta"
                ]
            }
        }
    },
    "trace": "verbose",
    "workspaceFolders": [
        {
            "uri": "file:///home/agentx3/TEMP/pyright-test",
            "name": "pyright-test"
        }
    ],
    "locale": "en_US",
    "clientInfo": {
        "name": "coc.nvim",
        "version": "0.0.82"
    },
    "workDoneToken": "735769f3-c6cc-4c17-83f1-5eb4e84711b8"
}


[Trace - 14:49:36.610] Received notification 'window/logMessage'.
Params: {
    "type": 3,
    "message": "Pyright language server 1.1.365 starting"
}


[Info  - 14:49:36.610] Pyright language server 1.1.365 starting
[Trace - 14:49:36.610] Received notification 'window/logMessage'.
Params: {
    "type": 3,
    "message": "Server root directory: file:///nix/store/hba29r28xzmiqxhgq8hrrva2fx293bkm-vimplugin-coc-pyright-1.1.365/node_modules/pyright/dist"
}


[Info  - 14:49:36.610] Server root directory: file:///nix/store/hba29r28xzmiqxhgq8hrrva2fx293bkm-vimplugin-coc-pyright-1.1.365/node_modules/pyright/dist
[Trace - 14:49:36.613] Received notification 'window/logMessage'.
Params: {
    "type": 3,
    "message": "Starting service instance \"pyright-test\""
}


[Info  - 14:49:36.613] Starting service instance "pyright-test"
[Trace - 14:49:36.615] Received response 'initialize - (0)' in 154ms.
Result: {
    "capabilities": {
        "textDocumentSync": 2,
        "definitionProvider": {
            "workDoneProgress": true
        },
        "declarationProvider": {
            "workDoneProgress": true
        },
        "typeDefinitionProvider": {
            "workDoneProgress": true
        },
        "referencesProvider": {
            "workDoneProgress": true
        },
        "documentSymbolProvider": {
            "workDoneProgress": true
        },
        "workspaceSymbolProvider": {
            "workDoneProgress": true
        },
        "hoverProvider": {
            "workDoneProgress": true
        },
        "documentHighlightProvider": {
            "workDoneProgress": true
        },
        "renameProvider": {
            "prepareProvider": true,
            "workDoneProgress": true
        },
        "completionProvider": {
            "triggerCharacters": [
                ".",
                "[",
                "\"",
                "'"
            ],
            "resolveProvider": true,
            "workDoneProgress": true,
            "completionItem": {
                "labelDetailsSupport": true
            }
        },
        "signatureHelpProvider": {
            "triggerCharacters": [
                "(",
                ",",
                ")"
            ],
            "workDoneProgress": true
        },
        "codeActionProvider": {
            "codeActionKinds": [
                "quickfix",
                "source.organizeImports"
            ],
            "workDoneProgress": true
        },
        "executeCommandProvider": {
            "commands": [],
            "workDoneProgress": true
        },
        "callHierarchyProvider": true,
        "workspace": {
            "workspaceFolders": {
                "supported": true,
                "changeNotifications": true
            }
        }
    }
}


[Trace - 14:49:36.616] Sending notification 'initialized'.
Params: {}


[Trace - 14:49:36.619] Sending notification 'workspace/didChangeConfiguration'.
Params: {
    "settings": {
        "python": {
            "analysis": {
                "indexing": true,
                "extraPaths": [],
                "typeshedPaths": [],
                "autoImportCompletions": true,
                "autoSearchPaths": true,
                "stubPath": "typings",
                "diagnosticMode": "openFilesOnly",
                "include": [],
                "exclude": [],
                "ignore": [],
                "diagnosticSeverityOverrides": {},
                "logLevel": "Information",
                "typeCheckingMode": "standard",
                "useLibraryCodeForTypes": true
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            "linting": {
                "enabled": true,
                "flake8Args": [],
                "flake8CategorySeverity": {
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                    "F": "Error",
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                "flake8Stdin": false,
                "flake8Path": "flake8",
                "ignorePatterns": [
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                    "**/site-packages/**/*.py"
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                "lintOnSave": true,
                "maxNumberOfProblems": 100,
                "banditArgs": [],
                "banditEnabled": false,
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                "mypyArgs": [
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                    "--follow-imports=silent",
                    "--show-column-numbers"
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                "mypyCategorySeverity": {
                    "error": "Error",
                    "note": "Information"
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                "mypyEnabled": false,
                "mypyPath": "mypy",
                "pytypeEnabled": false,
                "pytypePath": "pytype",
                "pytypeArgs": [],
                "pycodestyleArgs": [],
                "pycodestyleCategorySeverity": {
                    "E": "Error",
                    "W": "Warning"
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                "pycodestyleEnabled": false,
                "pycodestylePath": "pycodestyle",
                "prospectorArgs": [],
                "prospectorEnabled": false,
                "prospectorPath": "prospector",
                "pydocstyleArgs": [],
                "pydocstyleEnabled": false,
                "pydocstylePath": "pydocstyle",
                "pyflakesEnabled": false,
                "pyflakesPath": "pyflakes",
                "ruffEnabled": false,
                "ruffStdin": true,
                "ruffPath": "ruff",
                "ruffArgs": [],
                "pylamaArgs": [],
                "pylamaEnabled": false,
                "pylamaPath": "pylama",
                "pylintArgs": [],
                "pylintCategorySeverity": {
                    "convention": "Information",
                    "error": "Error",
                    "fatal": "Error",
                    "refactor": "Hint",
                    "warning": "Warning"
                },
                "pylintStdin": false,
                "pylintEnabled": false,
                "pylintPath": "pylint"
            },
            "pythonPath": "python",
            "venvPath": "",
            "formatting": {
                "blackArgs": [],
                "blackPath": "black",
                "ruffArgs": [],
                "ruffPath": "ruff",
                "pyinkArgs": [],
                "pyinkPath": "pyink",
                "darkerArgs": [],
                "darkerPath": "darker",
                "yapfArgs": [],
                "yapfPath": "yapf",
                "autopep8Args": [],
                "autopep8Path": "autopep8",
                "blackdPath": "blackd",
                "blackdHTTPURL": "",
                "blackdHTTPHeaders": {},
                "provider": "autopep8"
            },
            "sortImports": {
                "path": "isort",
                "args": []
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        "pyright": {
            "enable": true,
            "inlayHints": {
                "functionReturnTypes": true,
                "variableTypes": true,
                "parameterTypes": true
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            "disableCompletion": false,
            "disableDiagnostics": false,
            "disableDocumentation": false,
            "disableProgressNotifications": false,
            "disableTaggedHints": false,
            "completion": {
                "importSupport": true,
                "snippetSupport": true
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            "organizeimports": {
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            "server": "",
            "testing": {
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                "unittestArgs": []
            },
            "trace": {
                "server": "verbose"
            },
            "extraPaths": [
                "venv"
            ]
        }
    }
}


[Trace - 14:49:36.619] Sending notification 'textDocument/didOpen'.
Params: {
    "textDocument": {
        "uri": "file:///home/agentx3/TEMP/pyright-test/code.py",
        "languageId": "python",
        "version": 1,
        "text": "pow(1,-1,1)\n"
    }
}


[Trace - 14:49:36.620] Received request 'client/registerCapability - (0)'.
Params: {
    "registrations": [
        {
            "id": "f43683b1-740b-4963-86d8-78004b3e69a4",
            "method": "workspace/didChangeWatchedFiles",
            "registerOptions": {
                "watchers": [
                    {
                        "globPattern": "**/pyrightconfig.json",
                        "kind": 7
                    },
                    {
                        "globPattern": "**",
                        "kind": 7
                    }
                ]
            }
        }
    ]
}


[Trace - 14:49:36.620] Sending response 'client/registerCapability - (0)'. Processing request took 0ms
No result returned.


[Trace - 14:49:36.620] Received request 'workspace/configuration - (1)'.
Params: {
    "items": [
        {
            "scopeUri": "file:///home/agentx3/TEMP/pyright-test",
            "section": "python"
        }
    ]
}


[Trace - 14:49:36.621] Sending response 'workspace/configuration - (1)'. Processing request took 1ms
Result: [
    {
        "analysis": {
            "indexing": true,
            "extraPaths": [],
            "typeshedPaths": [],
            "autoImportCompletions": true,
            "autoSearchPaths": true,
            "diagnosticMode": "openFilesOnly",
            "include": [],
            "exclude": [],
            "ignore": [],
            "diagnosticSeverityOverrides": {},
            "logLevel": "Information",
            "typeCheckingMode": "standard",
            "useLibraryCodeForTypes": true
        },
        "linting": {
            "enabled": true,
            "flake8Args": [],
            "flake8CategorySeverity": {
                "E": "Error",
                "F": "Error",
                "W": "Warning"
            },
            "flake8Enabled": false,
            "flake8Stdin": false,
            "flake8Path": "flake8",
            "ignorePatterns": [
                ".vscode/*.py",
                "**/site-packages/**/*.py"
            ],
            "lintOnSave": true,
            "maxNumberOfProblems": 100,
            "banditArgs": [],
            "banditEnabled": false,
            "banditPath": "bandit",
            "mypyArgs": [
                "--no-pretty",
                "--ignore-missing-imports",
                "--follow-imports=silent",
                "--show-column-numbers"
            ],
            "mypyCategorySeverity": {
                "error": "Error",
                "note": "Information"
            },
            "mypyEnabled": false,
            "mypyPath": "mypy",
            "pytypeEnabled": false,
            "pytypePath": "pytype",
            "pytypeArgs": [],
            "pycodestyleArgs": [],
            "pycodestyleCategorySeverity": {
                "E": "Error",
                "W": "Warning"
            },
            "pycodestyleEnabled": false,
            "pycodestylePath": "pycodestyle",
            "prospectorArgs": [],
            "prospectorEnabled": false,
            "prospectorPath": "prospector",
            "pydocstyleArgs": [],
            "pydocstyleEnabled": false,
            "pydocstylePath": "pydocstyle",
            "pyflakesEnabled": false,
            "pyflakesPath": "pyflakes",
            "ruffEnabled": false,
            "ruffStdin": true,
            "ruffPath": "ruff",
            "ruffArgs": [],
            "pylamaArgs": [],
            "pylamaEnabled": false,
            "pylamaPath": "pylama",
            "pylintArgs": [],
            "pylintCategorySeverity": {
                "convention": "Information",
                "error": "Error",
                "fatal": "Error",
                "refactor": "Hint",
                "warning": "Warning"
            },
            "pylintStdin": false,
            "pylintEnabled": false,
            "pylintPath": "pylint"
        },
        "pythonPath": "/etc/profiles/per-user/agentx3/bin/python",
        "venvPath": "",
        "formatting": {
            "blackArgs": [],
            "blackPath": "black",
            "ruffArgs": [],
            "ruffPath": "ruff",
            "pyinkArgs": [],
            "pyinkPath": "pyink",
            "darkerArgs": [],
            "darkerPath": "darker",
            "yapfArgs": [],
            "yapfPath": "yapf",
            "autopep8Args": [],
            "autopep8Path": "autopep8",
            "blackdPath": "blackd",
            "blackdHTTPURL": "",
            "blackdHTTPHeaders": {},
            "provider": "autopep8"
        },
        "sortImports": {
            "path": "isort",
            "args": []
        }
    }
]


[Trace - 14:49:36.621] Received request 'workspace/configuration - (2)'.
Params: {
    "items": [
        {
            "scopeUri": "file:///home/agentx3/TEMP/pyright-test",
            "section": "python.analysis"
        }
    ]
}


[Trace - 14:49:36.622] Sending response 'workspace/configuration - (2)'. Processing request took 1ms
Result: [
    {
        "indexing": true,
        "extraPaths": [],
        "typeshedPaths": [],
        "autoImportCompletions": true,
        "autoSearchPaths": true,
        "diagnosticMode": "openFilesOnly",
        "include": [],
        "exclude": [],
        "ignore": [],
        "diagnosticSeverityOverrides": {},
        "logLevel": "Information",
        "typeCheckingMode": "standard",
        "useLibraryCodeForTypes": true
    }
]


[Trace - 14:49:36.622] Received request 'workspace/configuration - (3)'.
Params: {
    "items": [
        {
            "scopeUri": "file:///home/agentx3/TEMP/pyright-test",
            "section": "pyright"
        }
    ]
}


[Trace - 14:49:36.622] Sending response 'workspace/configuration - (3)'. Processing request took 0ms
Result: [
    {
        "enable": true,
        "inlayHints": {
            "functionReturnTypes": true,
            "variableTypes": true,
            "parameterTypes": true
        },
        "disableCompletion": false,
        "disableDiagnostics": false,
        "disableDocumentation": false,
        "disableProgressNotifications": false,
        "disableTaggedHints": false,
        "completion": {
            "importSupport": true,
            "snippetSupport": true
        },
        "organizeimports": {
            "provider": "isort"
        },
        "server": "",
        "testing": {
            "provider": "unittest",
            "pytestArgs": [],
            "unittestArgs": []
        },
        "trace": {
            "server": "verbose"
        },
        "extraPaths": [
            "venv"
        ]
    }
]


[Trace - 14:49:36.623] Received notification 'window/logMessage'.
Params: {
    "type": 3,
    "message": "Setting pythonPath for service \"pyright-test\": \"/etc/profiles/per-user/agentx3/bin/python\""
}


[Info  - 14:49:36.623] Setting pythonPath for service "pyright-test": "/etc/profiles/per-user/agentx3/bin/python"
[Trace - 14:49:36.643] Received notification 'window/logMessage'.
Params: {
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[Info  - 14:49:36.643] Assuming Python version 3.12.3.final.0
[Trace - 14:49:36.691] Received notification 'window/logMessage'.
Params: {
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[Info  - 14:49:36.691] Found 2 source files
[Trace - 14:49:36.692] Received request 'client/registerCapability - (4)'.
Params: {
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[Trace - 14:49:36.692] Sending response 'client/registerCapability - (4)'. Processing request took 0ms
No result returned.


[Trace - 14:49:36.692] Received request 'client/unregisterCapability - (5)'.
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[Trace - 14:49:36.692] Sending response 'client/unregisterCapability - (5)'. Processing request took 0ms
No result returned.


[Trace - 14:49:37.051] Received notification 'textDocument/publishDiagnostics'.
Params: {
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[Trace - 14:49:37.097] Sending request 'textDocument/signatureHelp - (1)'.
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[Trace - 14:49:40.189] Sending request 'textDocument/documentHighlight - (2)'.
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[Trace - 14:49:40.489] Sending notification '$/cancelRequest'.
Params: {
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[Trace - 14:49:45.695] Received response 'textDocument/signatureHelp - (1)' in 8598ms.
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[Trace - 14:49:45.695] Sending request 'textDocument/signatureHelp - (3)'.
Params: {
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[Trace - 14:49:45.695] Received response 'textDocument/documentHighlight - (2)' in 5506ms. Request failed: request cancelled (-32800).
[Error - 14:49:45.695] Sending request textDocument/documentHighlight failed.
  Message: request cancelled
  Code: -32800 
[Trace - 14:49:50.360] Sending request 'textDocument/signatureHelp - (4)'.
Params: {
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[Trace - 14:49:54.303] Received response 'textDocument/signatureHelp - (3)' in 8608ms.
Result: {
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[Trace - 14:49:54.304] Sending request 'textDocument/signatureHelp - (5)'.
Params: {
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[agentx3]

In general it seems like the performance has slowed down greatly. For example, even

import json
f = open("msg.json", "r")
msg = json.load(f)

takes sometime to load (~30s), but the pow was the most extreme case. So it might be a symptom of a larger issue

[agentx3]

OK, I think I found the culprit after spending a bunch of time messing with the settings. The issue goes away when I set inlayHints.parameterTypes = false, so it's probably something about how that's implemented. I'm happy to have this marked as closed if you are.

[fannheyward]

coc-pyright uses getCallNodeAndActiveParameterIndex from Pyright to add parameter inlayHint, and Pyright is slow on this case, we can't do anything for this by now. Leave this open for future debugging.

[ammen99]

I also am encountering the same issue with latest coc-pyright, spent like a day trying to figure out what is going on, indeed, something like a single open() call is enough to make pyright use lots of CPU. However it seems that this is a problem only for some functions and not for others - i.e calling json.dumps() seems to not cause any issues. Is there already a pyright issue (if this is indeed a problem with pyright)?

[Krzmbrzl]

Has there been any report to the Pyright maintainers with specifics of what exactly is taking so insanely long? I was unable to find any mention of getCallNodeAndActiveParameterIndex in the official Pyright repository and don't have enough context to actually create an issue about this performance problem.

[fannheyward]

@Krzmbrzl it's getCallNodeAndActiveParamIndex function now.

I haven't reported this to the Pyright repository because the function is internal and coc-pyright used this in a hack way. Pyright uses TypeEvaluator to analyze and compute parameters typing, but coc-pyright can't use this, instead coc-pyright use the getCallNodeAndActiveParamIndex function which is expensive on some time.