compviz

compviz aims to visualize the btrfs filesystem compression statistics.

Features

As of now, it is simply a rewrite of compsize in Rust.

However, compviz takes advantage of the easy parallelism that Rust provides, so it should be faster if you have multiple CPU cores. Check the benchmarks on my 13th Gen Intel(R) Core(TM) i5-13490F:

Command	Mean [ms]	Min [ms]	Max [ms]	Ralative	x Times Faster
compsize	883.93±8.18	875.032	904.783	100.00%	1.00
compviz(1 thread)	943.41±3.57	938.748	948.599	106.73%±1.07%	0.94±0.01
compviz(2 threads)	497.40±3.39	493.394	504.788	56.27%±0.65%	1.78±0.02
compviz(3 threads)	359.16±6.07	351.615	373.391	40.63%±0.78%	2.46±0.05
compviz(4 threads)	287.48±1.90	284.497	290.025	32.52%±0.37%	3.07±0.03
compviz(5 threads)	241.02±6.07	236.355	257.283	27.27%±0.73%	3.67±0.10
compviz(6 threads)	207.48±2.63	202.456	212.877	23.47%±0.37%	4.26±0.07
compviz(7 threads)	191.60±2.32	188.854	196.265	21.68%±0.33%	4.61±0.07
compviz(8 threads)	178.03±1.35	175.852	180.732	20.14%±0.24%	4.97±0.06
compviz(9 threads)	168.95±2.58	165.517	175.895	19.11%±0.34%	5.23±0.09
compviz(10 threads)	168.96±8.01	160.387	189.383	19.11%±0.92%	5.23±0.25
compviz(11 threads)	178.69±20.74	156.699	221.654	20.21%±2.35%	4.95±0.58
compviz(12 threads)	179.70±22.52	155.721	219.595	20.33%±2.56%	4.92±0.62
compviz(13 threads)	184.90±15.12	150.380	205.035	20.92%±1.72%	4.78±0.39
compviz(14 threads)	192.46±22.12	153.112	216.941	21.77%±2.51%	4.59±0.53
compviz(15 threads)	185.12±17.19	162.086	216.368	20.94%±1.95%	4.77±0.45
compviz(16 threads)	192.81±18.81	163.218	216.273	21.81%±2.14%	4.58±0.45

Parallelism

According to the result of benchmarks, by default, compviz uses as many threads as:

• RAYON_NUM_THREADS env var if set
• based of the number of logical CPUs, let which be n:
  • n if n <= 6
  • n/2 if 6 < n < 24
  • 24 if n >= 24