mini-jc

A jc clone with reasonable performance.

Motivation

I use jc to show system stats in my taskbar on my Linux setup. Since jc is written in Python, it took ~50ms to spin up, parse the 3 lines of output from free and output it as json. I found this too slow as I have to run this every second and I don't want to give up a permanent 5% of a CPU core just to show my memory usage.

Also I was bored.

Installation

Using a Rust toolchain

Run cargo install --git https://github.com/holly-hacker/mini-jc.

Differences from jc

• mini-jc is a single, statically linked executable so it is fairly to install
• mini-jc executes magnitudes faster due to not having to start up a runtime
• mini-jc supports way fewer parsers. I will likely only add support for tools I use myself.
• mini-jc will convert "human-readable" sizes to absolute values
• mini-jc tries to copy jc's output naming, but doesn't do so everywhere

Supported parsers

• free: matches jc
• df: matches jc, property names have being changed to be more consistent

Performance

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
jc --free	44.3 ± 0.3	43.7	45.5	112.19 ± 9.90
mini-jc free	0.4 ± 0.0	0.3	1.1	1.00

Command	Mean [ms]	Min [ms]	Max [ms]	Relative
jc --df	46.8 ± 0.8	46.0	50.8	111.48 ± 10.33
mini-jc df	0.4 ± 0.0	0.3	0.7	1.00