BASH - is it possible to check memory usage of command? - linux

Question

I want to check how much resources took each command in my script
example code
#!/bin/bash
mkdir /tmp/{1..100}
touch /tmp/{1..100}
I want to know what resource was taken by mkdir and what by touch

Answer 1

You can use the command perf, and it's really complete.
Intall it with those 2 commands:
sudo apt install linux-tools-common
sudo apt install linux-tools-5.4.0-47-generic
test#test:~/work$ sudo perf stat ls
perf.data
Performance counter stats for 'ls':
0.83 msec task-clock # 0.793 CPUs utilized
2 context-switches # 0.002 M/sec
0 cpu-migrations # 0.000 K/sec
113 page-faults # 0.136 M/sec
<not supported> cycles
<not supported> instructions
<not supported> branches
<not supported> branch-misses
0.001051057 seconds time elapsed
0.000989000 seconds user
0.000000000 seconds sys
This my repository
test#test:~$ cat /etc/apt/sources.list
deb http://fr.archive.ubuntu.com/ubuntu focal-security universe
deb http://fr.archive.ubuntu.com/ubuntu focal-security multiverse
My distribution
test#test:~$ uname -a
Linux test 5.4.0-47-generic #51-Ubuntu SMP Fri Sep 4 19:50:52 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux