centos cmatrix的性能监控

Installing cmatrix on CentOS
To use cmatrix for performance monitoring, first install it on your CentOS system. For CentOS 7 or earlier (using yum), run:

sudo yum install epel-release  # Ensure EPEL repository is available
sudo yum update
sudo yum install cmatrix

For CentOS 8 or later (using dnf), use:

sudo dnf install cmatrix

This installs cmatrix, a terminal-based tool that displays real-time system resource usage (like CPU, memory) in a dynamic matrix animation.

Basic Usage for Performance Monitoring
Run cmatrix in the terminal to start the default view, which shows:

• CPU usage (user/system/idle percentages)
• Memory usage (total/used/free breakdown)
• Process count (total/running/sleeping/zombie processes)

Example output:

CPU Usage:  12.3%us,  4.5%sy,  83.2%id
Memory Usage: 1.234GB/8.000GB (15%)
Processes: 123 total,   1 running, 122 sleeping

Press q to quit.

Customizing Monitored Metrics via Configuration File
To tailor the displayed metrics, edit the cmatrix configuration file (located at ~/.cmatrixrc). If the file doesn’t exist, create it with a text editor (e.g., nano ~/.cmatrixrc). Add the following lines to enable specific metrics:

cpu 1 2 3 4  # Display CPU usage for cores 1-4
mem        # Show memory usage
swap       # Include swap partition usage
procs      # Display process count

Save the file and restart cmatrix (cmatrix) to apply changes. This lets you focus on the metrics most relevant to your performance assessment.

Adjusting Display Parameters for Performance Impact
You can indirectly evaluate system performance by modifying cmatrix’s rendering behavior. Common adjustments include:

• Color: Use -c or --colors to enable color (e.g., cmatrix -c) or -C to disable it. More colors may increase GPU/CPU load.
• Matrix Size: Use -s or --size to change the matrix density (e.g., cmatrix -s 20 for a denser grid). Larger sizes demand more rendering resources.
• Refresh Rate: Use -d or --delay to adjust update intervals (e.g., cmatrix -d 0.5 for faster updates). Shorter delays increase CPU usage.
• Text Overlay: Use -t or --text to add custom text (e.g., cmatrix -t "Performance Test"). Text processing adds computational overhead.
  Run these commands and observe how the system handles the load—higher CPU/memory usage indicates better performance capacity.

Important Notes on Performance Testing Limits
While cmatrix helps visually assess system responsiveness, it is not a substitute for professional performance tools (e.g., top, htop, perf). Its primary purpose is to display real-time system stats in an engaging way, not to conduct rigorous benchmarking. For accurate performance metrics (e.g., CPU utilization percentages, memory bandwidth), use dedicated system monitoring tools.