Arch: CPU stress test script with tmux split view of live journalctl events

FocusedWolf

Jul 12th, 2025 (edited)

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#!/bin/bash
# Version 7
# Installation:
# $ sudo cp ./testcpu /usr/local/bin/
# $ sudo chmod +x /usr/local/bin/testcpu
# This script runs 'stress-ng' on each CPU one at a time,
# while showing live system logs via journalctl in a split tmux session.
#
# Usage:
# 1. Ensure 'tmux' and 'stress-ng' are installed: $ sudo pacman -S tmux stress-ng
#
# 2. Run the script with: $ testcpu
#
# 3. This script will launch a tmux session named 'cpu_test' with two panes:
# The top pane runs the stress test.
# The bottom pane displays live journalctl events.
# NOTE: This script runs continuously until manually stopped.
#
# 4. To stop this script:
# From inside tmux: press Ctrl+C in each pane and run $ exit
# From outside tmux: $ sudo tmux kill-session -t cpu_test
# NOTE: If tmux or stress-ng are still running then terminate them using System Monitor or any process manager you prefer.
# If tmux is not installed.
if ! command -v tmux >/dev/null 2>&1; then
echo -e "\e[94m::\e[0m tmux could not be found. Install with: $ sudo pacman -S tmux"
exit 1
fi
# If stress-ng is not installed.
if ! command -v stress-ng >/dev/null 2>&1; then
echo -e "\e[94m::\e[0m stress-ng could not be found. Install with: $ sudo pacman -S stress-ng"
exit 1
fi
# Check if script is running as root, if not re-run with sudo
if [[ $EUID -ne 0 ]]; then
echo "Requesting administrative privileges..."
exec sudo "$0" "$@"
fi
SESSION="cpu_test"
# Number of logical CPUs
NUM_CPUS=$(nproc)
# Create new tmux session (detached)
tmux new-session -d -s "$SESSION"
# Split window horizontally: bottom pane for journalctl
tmux split-window -v -t "$SESSION"
# In bottom pane: run journalctl live
tmux send-keys -t "$SESSION:0.1" "journalctl -fk -o short-iso" C-m
# In top pane: run loop that cycles through each cpu using stress-ng
tmux send-keys -t "$SESSION:0.0" "$(cat <<'EOF'
cleanup() {
echo "Interrupted! Killing stress-ng and exiting..."
[[ -n "${STRESS_PID}" && "${STRESS_PID}" =~ ^[0-9]+$ ]] && kill "${STRESS_PID}" 2>/dev/null
exit 1
}
# Run cleanup() function on script interruption or termination.
trap cleanup SIGINT SIGTERM SIGHUP
COLOR="\e[94m::\e[0m" # Bright Blue.
NUM_CPUS=$(nproc)
SECONDS_PER_TEST=10 # The duration of the cpu tests.
SECONDS_BETWEEN_TESTS=3 # The delay between cpu tests (gives time to read the output and for the processor to cool).
TOTAL_TIME=$((NUM_CPUS * (SECONDS_PER_TEST + SECONDS_BETWEEN_TESTS)))
while true; do
# Loop through all CPUs, stress-testing each sequentially.
for cpu in $(seq 0 $((NUM_CPUS - 1))); do
clear # NOTE: Comment out this line if you want to retain the output from past tests instead of clearing it.
TIME_ELAPSED=$((cpu * (SECONDS_PER_TEST + SECONDS_BETWEEN_TESTS)))
TIME_REMAINING=$((TOTAL_TIME - TIME_ELAPSED))
PROGRESS=$(( (cpu + 1) * 100 / NUM_CPUS ))
ETA=$(printf '%02d:%02d:%02d' $((TIME_REMAINING / 3600)) $(((TIME_REMAINING % 3600) / 60)) $((TIME_REMAINING % 60)))
echo -e "${COLOR} Testing CPU $((cpu + 1)) of $NUM_CPUS [Progress: ${PROGRESS}% ETA: ${ETA}]\n"
taskset -c "$cpu" stress-ng --cpu 1 --cpu-method all --metrics-brief --timeout ${SECONDS_PER_TEST}s &
STRESS_PID=$!
wait "${STRESS_PID}"
unset STRESS_PID
echo -e "\n${COLOR} Pausing for ${SECONDS_BETWEEN_TESTS} seconds before continuing...\n"
sleep "${SECONDS_BETWEEN_TESTS}"
done
echo -e "${COLOR} All CPUs have been tested. Restarting test cycle in ${SECONDS_BETWEEN_TESTS} seconds..."
sleep "${SECONDS_BETWEEN_TESTS}"
done
EOF
)" C-m
# Attach to tmux session
tmux attach -t "$SESSION"

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