rusage

Like time(1) but for resource usage.

Usage

; rusage ls
LICENSE             default.nix     flake.nix       rusage.c
README.rst  flake.lock      rusage.sh

Wall time (secs):        0.013
CPU time (secs):         user=0.003; system=0.006
Max resident set size:   1347584
Integral shared memory:  0
Integral unshared data:  0
Integral unshared stack: 0
Page reclaims:           863
Page faults:             0
Swaps:                   0
Block I/Os:              input=0; output=0
Signals received:        0
IPC messages:            sent=0; received=0
Context switches:        voluntary=0; involuntary=7

; rusage -q ls
Wall time (secs):        0.013
CPU time (secs):         user=0.003; system=0.006
Max resident set size:   1347584
Integral shared memory:  0
Integral unshared data:  0
Integral unshared stack: 0
Page reclaims:           863
Page faults:             0
Swaps:                   0
Block I/Os:              input=0; output=0
Signals received:        0
IPC messages:            sent=0; received=0
Context switches:        voluntary=0; involuntary=7

; rusage --json rusage.json ls
LICENSE             default.nix     flake.nix       rusage.c
README.rst  flake.lock      rusage.sh
; cat rusage.json
{
"wall time": 0.010,
"user time": 0.001,
"system time": 0.001,
"max rss": 2179072,
"integral shared memory": 0,
"integral unshared data": 0,
"integral unshared stack": 0,
"page reclaims": 185,
"page faults": 0,
"swaps": 0,
"block reads": 0,
"block writes": 0,
"signals received": 0,
"ipc sends": 0,
"ipc receives": 0,
"voluntary context switches": 0,
"involuntary context switches": 19
}

Building

Just use cargo.