0.11.0 seems to be slower than 0.10.2 on Ubuntu

[neur1n]

Checklist

• I've looked through the troubleshooting docs, the known problems list, and existing open issues for similar issues.

What operating system and version are you using?

Ubuntu 20.04 & 22.04

What architecture are you using?

x86_64/AMD64

What terminal(s) are you running bottom on that are experiencing the problem?

Wezterm 20240204-094054-a0974a25

(Optional) What filesystem(s) are you using?

No response

What version of bottom are you running?

0.11.0

How did you install bottom?

Installed by downloading prebuilt binary from GitHub.

Describe the issue

Version 0.11.0 of bottom exhibits significantly higher latency compared to version 0.10.2 when displaying the initial statistics, on Ubuntu but not Windows 11 though.

Testing Method:

1. Launch btm and immediately exit upon the appearance of the statistics.
2. Measure the elapsed time using $env.CMD_DURATION_MS in Nushell. Acknowledging this is not a precise benchmark, but relative differences are notable.

Results:
• 0.10.2: ~2447 ms
• 0.11.0: ~12344 ms

What is the expected behaviour?

The latency should be similar.

What is the actual behaviour?

Statistics takes a long time to show up.

How can we reproduce this?

Launch bottom and profile the time it takes for the initial statistics to show up.

Additional information

No response

[ClementTsang]

Hmm... not sure why this is the case, maybe there's extra work being done due to the stuff like GPU? Actually, if you run btm --disable_gpu, does it change anything?

I'll look into it though and see if I can replicate on my Linux machine.

[ClementTsang]

Hmm... I can't replicate this on either zsh or nu, but I can take a look and see if I can make it so things don't block as much/there's a timeout (#687 might be related).

[ClementTsang]

Also just double checking, which binary did you download?

[neur1n]

@ClementTsang Thanks for the response.

Using --enable_gpu on v0.10.2 and --disable_gpu on v0.11.0 makes neglectable differences:

Version	w/ GPU (ms)	w/o GPU (ms)
0.10.2	1358	1258
0.11.2	12402	11357

I'm using the bottom_x86_64-unknown-linux-<c>.tar.gz where <c> is gnu and musl (I've tested both).

[ClementTsang]

Thanks for the info, at least that narrows some things down.

[neur1n]

Hmm... I can't replicate this on either zsh or nu, but I can take a look and see if I can make it so things don't block as much/there's a timeout (#687 might be related).

Which part of the source code is related to the timeout mechanism?

[ClementTsang]

There isn't any at the moment... it's all synchronous code, data collection runs on a separate thread.

It's unlikely tbh that I can actually add a timeout (barring going into async but that's a very hmmm choice for this is my gut feeling) I can explore threading things more though.

[neur1n]

Though it seems counterintuitive to me, the new version runs well on Windows 11.

[neur1n]

@ClementTsang Thanks for your work on v0.11.1, but the startup is still slow. Is there a way I can debug on my machine?

[ClementTsang]

Barring making code changes like debug logs, not really. I could compile a binary here with debug logs I guess.

[ClementTsang]

Could you also give me some info on system specs? e.g. GPU, CPU, etc?

[ClementTsang]

Also tested it on wezterm on my Linux machine and there's no difference, so it isn't that.