multi-aspect system monitoring

 My own script:

#!/bin/bash


echo "Resource Usage Report"

echo "====================="


# Top 3 CPU consumers

echo "CPU:"

ps -eo pid,comm,%cpu --sort=-%cpu | head -n 4 | awk 'NR>1 {printf "- %s: %s%%\n", $2, $3}'


# Top 3 Memory consumers

echo "RAM:"

ps -eo pid,comm,%mem --sort=-%mem | head -n 4 | awk 'NR>1 {printf "- %s: %s%%\n", $2, $3}'


# Top 3 Disk IO consumers

echo "Disk:"

iotop -b -n 1 | head -n 12 | grep -E '^ *[0-9]' | awk '{printf "- %s: %s%%\n", $12, $10}' | head -n 3


1. iostat (from the sysstat package)

  • Use: Provides detailed statistics about CPU utilisation and I/O performance for devices and partitions.
  • Why Use It:
    • Focused on I/O bottlenecks.
    • Breaks down performance metrics by individual devices (e.g., disks).
    • Includes metrics like device utilisation, read/write speeds, and queue lengths.

2. iotop

  • Use: Displays real-time I/O usage by processes.
  • Why Use It:
    • Identifies processes responsible for high disk I/O.
    • Useful for pinpointing resource-heavy applications impacting storage performance.

3. dstat

  • Use: A versatile tool that combines features of iostat, vmstat, and ifstat with additional statistics.
  • Why Use It:
    • Provides a single comprehensive view of system performance metrics.
    • Customisable and can show CPU, memory, disk, network, and more in real-time.
    • Easier to read and interpret compared to individual tools.

4. sar (from the sysstat package)

  • Use: Collects, reports, and saves system activity data over time.
  • Why Use It:
    • Tracks historical performance data for CPU, memory, and I/O usage.
    • Useful for identifying trends and diagnosing intermittent issues.
    • Allows performance monitoring over longer durations.

5. smartctl (from the smartmontools package)

  • Use: Monitors the health of storage devices using S.M.A.R.T. data.
  • Why Use It:
    • Essential for assessing hardware reliability.
    • Detects impending disk failures through metrics like reallocated sectors or I/O error rates.
    • Complements resource monitoring by ensuring hardware health.

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