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Tachyon's TUI sometimes does not work on the first try #143040
Description
Bug report
I am trying out the new profile's TUI and this happens:
2025-12-21.11.16.05.mov
When I first run the command, it shows either nothing or just a black screen. The second run always (?) works correctly.
Since I am on macos, I have to use sudo to run the profiler. And the first sudo run requires the password. Maybe that's related?
My env:
- vscode's terminal
- macos
- zsh
CC @pablogsal
Activity
yihong0618 commentedon Dec 21, 2025
it happens to me once, but it happens in VS Code terminal
pablogsal commentedon Dec 21, 2025
Will take a look soon
pablogsal commentedon Dec 21, 2025
@sobolevn can you confirm if this also happens to you in a non-vscode terminal ?
pablogsal commentedon Dec 21, 2025
Also in the video you are nesting two --live instances so that is also a possible cause. Does this happen also if you don't do that?
pablogsal commentedon Dec 21, 2025
Hummm, looking at your invocation I am noticing is just wrong. You are calling the profiler with:
but that's not how you are supposed to nest them: the second call should NOT use
./python.exe. What's happening here is that the program is failing to even start. Maybe we should make this into "the live TUI doesn't;t properly report starting errors"pablogsal commentedon Dec 21, 2025
It you launch this with
sudo -E SAMPLING_LIVE_TRACE=/tmp/live_trace.log ./python.exe -m profiling.sampling run -d 99999 --live -m test test_gcit should workpablogsal commentedon Dec 21, 2025
I have tried
sudo -E SAMPLING_LIVE_TRACE=/tmp/live_trace.log ./python.exe -m profiling.sampling run -d 99999 --live -m test test_gcin the exact same environment as you report (macOS + vsCode terminal + zsh) and cannot reproducepablogsal commentedon Dec 21, 2025
Ok I am 100% sure the problem here is that the program is crashing with an exception or something else before it can start. The UX is horrible because the user gets no feedback and you cannot see the exception :(
[-]Tachion's TUI sometimes does not work on the first try[/-][+]Tachyon's TUI sometimes does not work on the first try[/+]gh-143040: Exit taychon live mode gracefully and display profiled scr…
pablogsal commentedon Dec 27, 2025
Closing as now we have a better error message
pythongh-143040: Exit taychon live mode gracefully and display profil…