The python debugger is extremely slow

[DonJayamanne]

From @mjbvz on April 19, 2017 21:0

From @FuZhiyu on April 19, 2017 7:37

• VSCode Version: Code 1.11.2 (6eaebe3b9c70406d67c97779468c324a7a95db0e, 2017-04-13T07:56:42.517Z)
• OS Version: Darwin x64 16.5.0
• Extensions:

Extension	Author	Version
project-manager	alefragnani	0.14.0
gitignore	codezombiech	0.5.0
git-extension-pack	donjayamanne	0.1.2
githistory	donjayamanne	0.2.0
python	donjayamanne	0.6.2
gitlens	eamodio	3.4.5
sublime-keybindings	ms-vscode	2.0.1
vscode-open-in-github	ziyasal	1.2.3

---

Steps to Reproduce:

1. run the VSC debugger;
2. run the file in the console;
3. compare the speed.

Running in the VSC debugger is much slower than running it outside.

Copied from original issue: microsoft/vscode#25001

Copied from original issue: DonJayamanne/pythonVSCode#897

[DonJayamanne]

Please Define extremely slow.
Debugging applications will always be slower than running without debugging, that's an obvious fact.

So please define extremely slow, is it unusable? Please provide the sample code.

[DonJayamanne]

@FuZhiyu fyi

[DonJayamanne]

From @xoviat on April 20, 2017 17:38

@mjbvz this is actually somewhat your problem because pythonvscode uses the visual studio python debugger. However, I'm working to move to the pydev debugger, which is significantly faster.

[DonJayamanne]

Still haven't answered the questions.

[DonJayamanne]

@xoviat
How is this @mjbvz 's problem?

@mjbvz this is actually somewhat your problem because pythonvscode

[DonJayamanne]

From @xoviat on April 21, 2017 14:37

He works for Microsoft and the debugger is written by Microsoft. Now, I'm not asking him to fix this project's problems and I have no ill will towards Microsoft, but I am pointing out that the visual studio debugger probably has the same problems.

[DonJayamanne]

Lol. We can't start pointing fingers at anyone who works at Msft, just because you have a bunch that there is a problem with a piece of code written by sometime is some other totally different department.
Besides the problem could be with my implementation of the code, I don't think you have ruled that out.

I don't think it's a good idea to start pointing fingers on this manner. If you stay doing this, you only alienate people in the opens source community.

[DonJayamanne]

From @xoviat on April 21, 2017 23:3

I'm not blaming microsoft. I'm saying that they might need to fix their debugger for visual studio. I'm not complaining. I thought I made it clear that I had no problems with microsoft.

[DonJayamanne]

From @GiuseppeLaurenza on May 12, 2017 15:26

@xoviat There are any news about the inclusion of pydev debugger?

@DonJayamanne Some times with multithreading programming i see strange crash that i do not see with Pycharm (that use pydev) so i think that the problem is VS debugger. Also the performance of VS code in debug mode are poor with respect to the performance of Pycharm

[DonJayamanne]

From @xoviat on May 12, 2017 15:30

@GiuseppeLaurenza

I have an open pull request here: DonJayamanne#942

If you want to help, fork that and then fix the travis-ci tests.

[DonJayamanne]

From @GiuseppeLaurenza on May 12, 2017 15:33

@xoviat
Thanks for the fast reply. I hope that I can help. At the end of the next job deadline I try to help

[DonJayamanne]

From @lsternlicht on June 12, 2017 17:34

any idea of what changed here? I am also experiencing extremely slow debug

[DonJayamanne]

Nothing has changed in the extension to slow down the debugging experience. I'll check vscode.