Performance Monitoring Techniques

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  1. Performance Monitoring Techniques

This article provides a comprehensive overview of performance monitoring techniques for a MediaWiki 1.40 installation. Effective monitoring is crucial for maintaining a responsive and stable wiki, especially as user base and content volume grow. This guide will cover key metrics, tools, and strategies for identifying and resolving performance bottlenecks.

Understanding Key Metrics

Before diving into tools, it's essential to understand *what* to monitor. Several metrics are critical to assess MediaWiki performance.

  • **CPU Usage:** Indicates how much processing power the server is utilizing. High CPU usage can point to inefficient code, excessive database queries, or a large number of concurrent users.
  • **Memory Usage:** Tracks the amount of RAM being used. Insufficient memory can lead to swapping, significantly slowing down performance.
  • **Disk I/O:** Measures the rate at which data is read from and written to the disk. Slow disk I/O is a common bottleneck, particularly with traditional hard drives.
  • **Database Performance:** Critical for MediaWiki. Metrics include query execution time, slow query logs, and connection pool size.
  • **Web Server Performance:** Metrics like requests per second, response time, and error rates.
  • **Cache Hit Rate:** Indicates how effectively the caching mechanisms (e.g., APCu, Memcached) are working.
  • **Network Latency:** Measures the delay in data transfer between the server and users.

Monitoring Tools

Several tools can be used to monitor these metrics. The choice depends on your server environment, budget, and technical expertise.

Server-Level Monitoring

These tools provide broad system-level insights.

Tool Description Operating System Support
`top` / `htop` Real-time process monitoring. Shows CPU, memory usage, and process IDs. Linux, macOS
`vmstat` Reports virtual memory statistics, including CPU usage, swapping, and I/O. Linux, macOS
`iostat` Reports disk I/O statistics. Linux, macOS

Database Monitoring

Monitoring the database is crucial, as it is often the primary bottleneck.

Tool Description Database Support
`mysqladmin processlist` Shows currently running queries in MySQL. Useful for identifying long-running queries. MySQL, MariaDB
`pt-query-digest` (Percona Toolkit) Analyzes MySQL slow query logs to identify the most frequent and time-consuming queries. MySQL, MariaDB
phpMyAdmin Web-based interface for managing MySQL databases. Includes basic performance monitoring features. MySQL, MariaDB

Web Server Monitoring

Monitoring the web server (Apache or Nginx) provides insights into request handling.

Tool Description Web Server Support
`apachetop` Real-time monitoring of Apache processes and requests. Apache
`ngx_top` Similar to `apachetop` but for Nginx. Nginx
Web server access logs Analyzing access logs can reveal patterns of user activity and identify potential performance issues. Apache, Nginx

Implementing Monitoring Strategies

Simply collecting data isn't enough. You need a strategy to analyze and respond to it.

  • **Establish Baselines:** Monitor performance during normal usage to establish baseline values for each metric.
  • **Set Alerts:** Configure alerts to notify you when metrics exceed predefined thresholds. Tools like Nagios or Zabbix are helpful for this.
  • **Log Analysis:** Regularly analyze web server, database, and application logs for errors and warnings. Tools like Elasticsearch and Kibana can aid in log aggregation and analysis.
  • **Slow Query Logging:** Enable slow query logging in your database configuration. This will log queries that take longer than a specified amount of time to execute. See Database Administration for details.
  • **Caching Optimization:** Ensure that Caching is properly configured and tuned. Monitor cache hit rates to identify areas for improvement. Consider using Memcached or Redis for advanced caching.
  • **Regular Maintenance:** Schedule regular maintenance tasks, such as database optimization and index rebuilding. See Database Maintenance for more information.
  • **Profiling:** Use profiling tools (like Xdebug) to identify performance bottlenecks in PHP code.
  • **Hardware Monitoring:** Monitor hardware health (CPU temperature, disk health, etc.) to proactively identify potential failures. See Server Hardware for more information.
  • **Consider a Dedicated Monitoring Service:** Services like New Relic, Datadog, or Prometheus offer comprehensive monitoring features. These are often invaluable for larger deployments.


Troubleshooting Common Issues

  • **High CPU Usage:** Investigate long-running queries, inefficient code, or a large number of concurrent users. Consider Load Balancing.
  • **High Memory Usage:** Identify memory leaks in PHP code or increase the server's RAM.
  • **Slow Database Queries:** Optimize queries, add indexes, or consider using a database cache.
  • **Slow Page Load Times:** Optimize images, enable caching, and minimize HTTP requests. See Performance Optimization.
  • **Disk I/O Bottlenecks:** Consider using faster storage (e.g., SSDs) or optimizing disk usage.


Further Resources


Intel-Based Server Configurations

Configuration Specifications Benchmark
Core i7-6700K/7700 Server 64 GB DDR4, NVMe SSD 2 x 512 GB CPU Benchmark: 8046
Core i7-8700 Server 64 GB DDR4, NVMe SSD 2x1 TB CPU Benchmark: 13124
Core i9-9900K Server 128 GB DDR4, NVMe SSD 2 x 1 TB CPU Benchmark: 49969
Core i9-13900 Server (64GB) 64 GB RAM, 2x2 TB NVMe SSD
Core i9-13900 Server (128GB) 128 GB RAM, 2x2 TB NVMe SSD
Core i5-13500 Server (64GB) 64 GB RAM, 2x500 GB NVMe SSD
Core i5-13500 Server (128GB) 128 GB RAM, 2x500 GB NVMe SSD
Core i5-13500 Workstation 64 GB DDR5 RAM, 2 NVMe SSD, NVIDIA RTX 4000

AMD-Based Server Configurations

Configuration Specifications Benchmark
Ryzen 5 3600 Server 64 GB RAM, 2x480 GB NVMe CPU Benchmark: 17849
Ryzen 7 7700 Server 64 GB DDR5 RAM, 2x1 TB NVMe CPU Benchmark: 35224
Ryzen 9 5950X Server 128 GB RAM, 2x4 TB NVMe CPU Benchmark: 46045
Ryzen 9 7950X Server 128 GB DDR5 ECC, 2x2 TB NVMe CPU Benchmark: 63561
EPYC 7502P Server (128GB/1TB) 128 GB RAM, 1 TB NVMe CPU Benchmark: 48021
EPYC 7502P Server (128GB/2TB) 128 GB RAM, 2 TB NVMe CPU Benchmark: 48021
EPYC 7502P Server (128GB/4TB) 128 GB RAM, 2x2 TB NVMe CPU Benchmark: 48021
EPYC 7502P Server (256GB/1TB) 256 GB RAM, 1 TB NVMe CPU Benchmark: 48021
EPYC 7502P Server (256GB/4TB) 256 GB RAM, 2x2 TB NVMe CPU Benchmark: 48021
EPYC 9454P Server 256 GB RAM, 2x2 TB NVMe

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⚠️ *Note: All benchmark scores are approximate and may vary based on configuration. Server availability subject to stock.* ⚠️

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