Linux 系統效能監控

參考文獻：

1. https://www.nagios.org/projects/
2. http://www.brendangregg.com/linuxperf.html
3. http://www.cyberciti.biz/tips/top-linux-monitoring-tools.html
4. https://en.wikipedia.org/wiki/List_of_performance_analysis_tools
5. http://techblog.netflix.com/2015/11/linux-performance-analysis-in-60s.html
6. http://www.drupal001.com/2012/07/system-monitor-collectd/
7. http://www.tecmint.com/linux-performance-monitoring-with-collectl-tool/