Long operation nearly 80 seconds

[Gxinhu]

Recently, I have been attempting to use Visual Studio Code (VSCode) to view Python code from a research paper. However, I have encountered an issue where the Pylance server is performing poorly in certain files, taking almost 80 seconds to respond.

environmental information:

• Language Server version: 2023.5.50
• Operating System and version: Ubuntu 22.04 (running in a Docker container)
• Python version: 3.10

To reproduce the issue:

1. Open this code lib in vscode, specifically the dataset.py file.
2. Notice that the performance of VSCode is significantly slower than expected.

Expected behavior:

Fast response and smooth performance.

Actual behavior:

The response time is unacceptably slow.

Logs

2023-06-07 08:11:10.603 [info] [Info  - 8:11:10 AM] (151988) Pylance language server 2023.5.50 (pyright 0d248834) starting
2023-06-07 08:11:10.603 [info] [Info  - 8:11:10 AM] (151988) Server root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:11:10.608 [info] [Info  - 8:11:10 AM] (151988) Starting service instance "AirfRANS"
2023-06-07 08:11:10.631 [info] [Info  - 8:11:10 AM] (151988) Setting pythonPath for service "AirfRANS": "/usr/bin/python3"
2023-06-07 08:11:10.633 [info] [Warn  - 8:11:10 AM] (151988) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:11:10.648 [info] [Info  - 8:11:10 AM] (151988) Assuming Python version 3.10
2023-06-07 08:11:10.685 [info] [Info  - 8:11:10 AM] (151988) Found 41 source files
2023-06-07 08:11:10.809 [info] [Info  - 8:11:10 AM] (151988) Background analysis(1) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:11:10.811 [info] [Info  - 8:11:10 AM] (151988) Background analysis(1) started
2023-06-07 08:11:15.428 [info] [Info  - 8:11:15 AM] (151988) Indexer background runner(2) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:11:15.428 [info] [Info  - 8:11:15 AM] (151988) Indexing(2) started
2023-06-07 08:11:15.691 [info] [Info  - 8:11:15 AM] (151988) scanned(2) 62 files over 1 exec env
2023-06-07 08:11:16.136 [info] [Info  - 8:11:16 AM] (151988) indexed(2) 35 files over 1 exec env
2023-06-07 08:11:16.148 [info] [Info  - 8:11:16 AM] (151988) Indexing finished(2).
2023-06-07 08:11:27.678 [info] [Info  - 8:11:27 AM] (151988) Setting pythonPath for service "AirfRANS": "/home/user/miniconda3/bin/python"
2023-06-07 08:11:27.679 [info] [Warn  - 8:11:27 AM] (151988) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:11:27.716 [info] [Info  - 8:11:27 AM] (151988) Assuming Python version 3.10
2023-06-07 08:11:27.828 [info] [Info  - 8:11:27 AM] (151988) Found 41 source files
2023-06-07 08:11:28.013 [info] [Info  - 8:11:28 AM] (151988) Indexer background runner(3) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:11:28.014 [info] [Info  - 8:11:28 AM] (151988) Indexing(3) started
2023-06-07 08:11:28.231 [info] [Info  - 8:11:28 AM] (151988) scanned(3) 263 files over 1 exec env
2023-06-07 08:11:30.714 [info] [Info  - 8:11:30 AM] (151988) [IDX(3)] Long operation: index execution environment /workspace/fluid_python/AirfRANS (2443ms)
2023-06-07 08:11:30.714 [info] [Info  - 8:11:30 AM] (151988) [IDX(3)] Long operation: index packages /workspace/fluid_python/AirfRANS (2447ms)
2023-06-07 08:11:30.714 [info] [Info  - 8:11:30 AM] (151988) indexed(3) 194 files over 1 exec env
2023-06-07 08:11:30.727 [info] [Info  - 8:11:30 AM] (151988) Indexing finished(3).
2023-06-07 08:11:45.868 [info] [Info  - 8:11:45 AM] (153263) Pylance language server 2023.5.50 (pyright 0d248834) starting
2023-06-07 08:11:45.868 [info] [Info  - 8:11:45 AM] (153263) Server root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:11:45.873 [info] [Info  - 8:11:45 AM] (153263) Starting service instance "AirfRANS"
2023-06-07 08:11:45.890 [info] [Info  - 8:11:45 AM] (153263) Setting pythonPath for service "AirfRANS": "/home/user/miniconda3/bin/python"
2023-06-07 08:11:45.891 [info] [Warn  - 8:11:45 AM] (153263) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:11:45.907 [info] [Info  - 8:11:45 AM] (153263) Assuming Python version 3.10
2023-06-07 08:11:45.943 [info] [Info  - 8:11:45 AM] (153263) Found 41 source files
2023-06-07 08:11:46.176 [info] [Info  - 8:11:46 AM] (153263) Background analysis(1) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:11:46.176 [info] [Info  - 8:11:46 AM] (153263) Background analysis(1) started
2023-06-07 08:11:46.176 [info] [Info  - 8:11:46 AM] (153263) Indexer background runner(2) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:11:46.176 [info] [Info  - 8:11:46 AM] (153263) Indexing(2) started
2023-06-07 08:11:46.385 [info] [Info  - 8:11:46 AM] (153263) scanned(2) 263 files over 1 exec env
2023-06-07 08:11:48.785 [info] [Info  - 8:11:48 AM] (153263) [IDX(2)] Long operation: index execution environment /workspace/fluid_python/AirfRANS (2366ms)
2023-06-07 08:11:48.786 [info] [Info  - 8:11:48 AM] (153263) [IDX(2)] Long operation: index packages /workspace/fluid_python/AirfRANS (2369ms)
2023-06-07 08:11:48.786 [info] [Info  - 8:11:48 AM] (153263) indexed(2) 194 files over 1 exec env
2023-06-07 08:11:48.797 [info] [Info  - 8:11:48 AM] (153263) Indexing finished(2).
2023-06-07 08:12:14.694 [info] [Info  - 8:12:14 AM] (154176) Pylance language server 2023.5.50 (pyright 0d248834) starting
2023-06-07 08:12:14.694 [info] [Info  - 8:12:14 AM] (154176) Server root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:12:14.699 [info] [Info  - 8:12:14 AM] (154176) Starting service instance "AirfRANS"
2023-06-07 08:12:14.716 [info] [Info  - 8:12:14 AM] (154176) Setting pythonPath for service "AirfRANS": "/home/user/miniconda3/bin/python"
2023-06-07 08:12:14.717 [info] [Warn  - 8:12:14 AM] (154176) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:12:14.732 [info] [Info  - 8:12:14 AM] (154176) Assuming Python version 3.10
2023-06-07 08:12:14.768 [info] [Info  - 8:12:14 AM] (154176) Found 41 source files
2023-06-07 08:12:14.897 [info] [Info  - 8:12:14 AM] (154176) Background analysis(1) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:12:14.898 [info] [Info  - 8:12:14 AM] (154176) Background analysis(1) started
2023-06-07 08:12:15.072 [info] [Info  - 8:12:15 AM] (154176) Indexer background runner(2) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:12:15.072 [info] [Info  - 8:12:15 AM] (154176) Indexing(2) started
2023-06-07 08:12:15.194 [info] [Info  - 8:12:15 AM] (154176) scanned(2) 263 files over 1 exec env
2023-06-07 08:12:17.486 [info] [Info  - 8:12:17 AM] (154176) [IDX(2)] Long operation: index execution environment /workspace/fluid_python/AirfRANS (2261ms)
2023-06-07 08:12:17.486 [info] [Info  - 8:12:17 AM] (154176) [IDX(2)] Long operation: index packages /workspace/fluid_python/AirfRANS (2265ms)
2023-06-07 08:12:17.486 [info] [Info  - 8:12:17 AM] (154176) indexed(2) 194 files over 1 exec env
2023-06-07 08:12:17.500 [info] [Info  - 8:12:17 AM] (154176) Indexing finished(2).
2023-06-07 08:12:59.608 [info] [Info  - 8:12:59 AM] (155375) Pylance language server 2023.5.50 (pyright 0d248834) starting
2023-06-07 08:12:59.608 [info] [Info  - 8:12:59 AM] (155375) Server root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:12:59.614 [info] [Info  - 8:12:59 AM] (155375) Starting service instance "AirfRANS"
2023-06-07 08:12:59.630 [info] [Info  - 8:12:59 AM] (155375) Setting pythonPath for service "AirfRANS": "/home/user/miniconda3/bin/python"
2023-06-07 08:12:59.632 [info] [Warn  - 8:12:59 AM] (155375) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:12:59.647 [info] [Info  - 8:12:59 AM] (155375) Assuming Python version 3.10
2023-06-07 08:12:59.693 [info] [Info  - 8:12:59 AM] (155375) Found 41 source files
2023-06-07 08:12:59.819 [info] [Info  - 8:12:59 AM] (155375) Background analysis(1) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:12:59.821 [info] [Info  - 8:12:59 AM] (155375) Background analysis(1) started
2023-06-07 08:12:59.889 [info] [Info  - 8:12:59 AM] (155375) Indexer background runner(2) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:12:59.889 [info] [Info  - 8:12:59 AM] (155375) Indexing(2) started
2023-06-07 08:13:00.127 [info] [Info  - 8:13:00 AM] (155375) scanned(2) 263 files over 1 exec env
2023-06-07 08:13:02.526 [info] [Info  - 8:13:02 AM] (155375) [IDX(2)] Long operation: index execution environment /workspace/fluid_python/AirfRANS (2366ms)
2023-06-07 08:13:02.527 [info] [Info  - 8:13:02 AM] (155375) [IDX(2)] Long operation: index packages /workspace/fluid_python/AirfRANS (2370ms)
2023-06-07 08:13:02.527 [info] [Info  - 8:13:02 AM] (155375) indexed(2) 194 files over 1 exec env
2023-06-07 08:13:02.540 [info] [Info  - 8:13:02 AM] (155375) Indexing finished(2).
2023-06-07 08:13:37.585 [info] [Info  - 8:13:37 AM] (156390) Pylance language server 2023.5.50 (pyright 0d248834) starting
2023-06-07 08:13:37.586 [info] [Info  - 8:13:37 AM] (156390) Server root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:13:37.591 [info] [Info  - 8:13:37 AM] (156390) Starting service instance "AirfRANS"
2023-06-07 08:13:37.609 [info] [Info  - 8:13:37 AM] (156390) Setting pythonPath for service "AirfRANS": "/home/user/miniconda3/bin/python"
2023-06-07 08:13:37.610 [info] [Warn  - 8:13:37 AM] (156390) stubPath /workspace/fluid_python/AirfRANS/typings is not a valid directory.
2023-06-07 08:13:37.626 [info] [Info  - 8:13:37 AM] (156390) Assuming Python version 3.10
2023-06-07 08:13:37.662 [info] [Info  - 8:13:37 AM] (156390) Found 41 source files
2023-06-07 08:13:37.791 [info] [Info  - 8:13:37 AM] (156390) Background analysis(1) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist
2023-06-07 08:13:37.793 [info] [Info  - 8:13:37 AM] (156390) Background analysis(1) started
2023-06-07 08:13:37.864 [info] [Info  - 8:13:37 AM] (156390) Indexer background runner(2) root directory: /home/user/.vscode-server/extensions/ms-python.vscode-pylance-2023.5.50/dist (index)
2023-06-07 08:13:37.864 [info] [Info  - 8:13:37 AM] (156390) Indexing(2) started
2023-06-07 08:13:38.167 [info] [Info  - 8:13:38 AM] (156390) scanned(2) 263 files over 1 exec env
2023-06-07 08:13:40.558 [info] [Info  - 8:13:40 AM] (156390) [IDX(2)] Long operation: index execution environment /workspace/fluid_python/AirfRANS (2365ms)
2023-06-07 08:13:40.558 [info] [Info  - 8:13:40 AM] (156390) [IDX(2)] Long operation: index packages /workspace/fluid_python/AirfRANS (2369ms)
2023-06-07 08:13:40.558 [info] [Info  - 8:13:40 AM] (156390) indexed(2) 194 files over 1 exec env
2023-06-07 08:13:40.571 [info] [Info  - 8:13:40 AM] (156390) Indexing finished(2).
2023-06-07 08:15:01.600 [info] [Info  - 8:15:01 AM] (156390) [BG(1)] Long operation: checking: /workspace/fluid_python/AirfRANS/dataset.py (83613ms)
2023-06-07 08:15:01.600 [info] [Info  - 8:15:01 AM] (156390) [BG(1)] Long operation: analyzing: /workspace/fluid_python/AirfRANS/dataset.py (83755ms)
2023-06-07 08:15:03.825 [info] [Info  - 8:15:03 AM] (156390) [BG(1)] Long operation: checking: /workspace/fluid_python/AirfRANS/metrics.py (2180ms)
2023-06-07 08:15:03.825 [info] [Info  - 8:15:03 AM] (156390) [BG(1)] Long operation: analyzing: /workspace/fluid_python/AirfRANS/metrics.py (2196ms)

[StellaHuang95]

Hi @erictraut, just noticed that you created a pyright issue linked to it, would you prefer us to transfer this issue to Pyright?

[erictraut]

It's likely that this is a pyright issue (as opposed to an issue in the pylance language server features), but it's not 100% clear until we do a bit more investigation. Let's leave the two current issues in place for now. Once we have more info, we can decide what to do with the issues.

[StellaHuang95]

Looks like this has been addressed in pyright. microsoft/pyright#5260. Marking as fixed in the next version.

[heejaechang]

This issue has been fixed in prerelease version 2023.7.31, which we've just released. You can find the changelog here: CHANGELOG.md