Rhombus memory usage grows when terminal window closed

[ellifteria]

When I open a Rhombus REPL from the terminal and then close the terminal window without first killing the Rhombus REPL, the Racket process running the Rhombus REPL continuously grows to use more and more memory. This happens without the Rhombus REPL running any code (the process was running in a now-closed terminal window) and without DrRacket being open.

Machine: 2021 MacBook Pro 16-inch
Chip: Apple M1 Pro
Memory: 16 GB
OS: macOS Sonoma 14.5
Racket version: v8.14.0.2-2024-07-31-f82a96e5a9

Steps taken:

1. Open a new terminal window
2. racket -l rhombus -i
3. Wait until > appears on a new line showing the REPL is ready to use
4. Close the terminal window

Screenshots:

• Taken at 14:28

• Taken at 14:42 (14 minutes later)

• Taken at 14:48 (6 more minutes later)

[sorawee]

Wondering if it's related to racket/racket#4964. Is the CPU usage also high?

[ellifteria]

I just walked through the steps I listed again and activity monitor is reporting high CPU usage also. (I tried to attach an image but GitHub didn't like that so I'll just say that it peaked at ~98% CPU usage but dropped down since then.)

[ellifteria]

I sampled the process using Activity Monitor and this is what I got:

https://gist.github.com/ellifteria/9cb9b50a371a3c75a953136cf16249a7

It looks like most of the call stack is the GC.

[mflatt]

Are your terminal and shell the usual "Terminal.app" and "zsh"?

Assuming "Teminal.app", when you close the terminal window, does it ask about terminating processes?

Just to make sure, the -l rhombus part is needed, and you don't see this behavior with just racket, right?