#!/bin/bash

# Real-time CPU Frequency Monitor
# Shows actual CPU frequencies and helps identify boost behavior

echo "=== Real-time CPU Frequency Monitor ==="
echo "Press Ctrl+C to stop"
echo ""
echo "Note: Modern Intel CPUs dynamically adjust frequency based on:"
echo "  - Workload type (single vs multi-core)"
echo "  - Power limits (TDP)"
echo "  - Temperature"
echo "  - Energy efficiency preferences"
echo ""

# Check if turbostat is available
if command -v turbostat >/dev/null 2>&1; then
    echo "Using turbostat for accurate frequency monitoring..."
    echo ""
    sudo turbostat --quiet --show Core,CPU,Busy%,Bzy_MHz,PkgWatt --interval 2
else
    echo "turbostat not available, using basic monitoring..."
    echo ""
    echo "Timestamp       | CPU0    CPU1    CPU2    CPU3    | Avg MHz | Governor  | Temp"
    echo "----------------+---------------------------------+---------+-----------+------"
    
    while true; do
        TIMESTAMP=$(date +"%H:%M:%S")
        
        # Get frequencies
        FREQ0=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq)
        FREQ1=$(cat /sys/devices/system/cpu/cpu1/cpufreq/scaling_cur_freq)
        FREQ2=$(cat /sys/devices/system/cpu/cpu2/cpufreq/scaling_cur_freq)
        FREQ3=$(cat /sys/devices/system/cpu/cpu3/cpufreq/scaling_cur_freq)
        
        # Convert to MHz
        F0=$((FREQ0 / 1000))
        F1=$((FREQ1 / 1000))
        F2=$((FREQ2 / 1000))
        F3=$((FREQ3 / 1000))
        
        # Calculate average
        AVG=$(( (F0 + F1 + F2 + F3) / 4 ))
        
        # Get governor
        GOV=$(cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor)
        
        # Get temperature if available
        if [ -r "/sys/class/thermal/thermal_zone0/temp" ]; then
            TEMP_RAW=$(cat /sys/class/thermal/thermal_zone0/temp)
            TEMP=$((TEMP_RAW / 1000))
        else
            TEMP="N/A"
        fi
        
        printf "%s | %4d %4d %4d %4d | %4d MHz | %-9s | %s°C\n" \
            "$TIMESTAMP" "$F0" "$F1" "$F2" "$F3" "$AVG" "$GOV" "$TEMP"
        
        sleep 2
    done
fi