#!/bin/bash
set -e
set -u

cores=$(nproc)

limits=(
  # process_name:limit%
  firefox:$(( 50 * cores ))
  vesktop:$(( 20 * cores ))
)

# check for cpulimit command
if ! command -v cpulimit 2>/dev/null >/dev/null; then
  echo "ERROR: need cpulimit command" >&2
  exit 1
fi

limit_process() {
  local process_name="$1"
  local limit_percentage="${2%%.}"

  cpulimit -i -e "$process_name" -l "$limit_percentage"
}

limit_processes() {
  local pids
  pids=()
  for limit in "${limits[@]}"; do
    IFS=: read process_name limit_percentage <<<"$limit"
    limit_process "$process_name" "$limit_percentage" & pids+=($!) 
  done
  wait "${pids[@]}"
}

limit_processes