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The System Statistics application in Usage Engine collects and consolidates execution information automatically. When the system is active, resource utilization and workflow processing is continuously monitored, and the statistics is saved in the internal database. Graphs can be viewed in the Desktop, DROnline, and – if installed – Grafana..  

Desktop 

Using the System Statistics UI, a user can select statistics for hosts, pico instances, and workflows for periods dating back two months. Available metrics: 

Host 

Pico Instance 

Workflow 

  • CPU User Time (%) 
  • Context Switch (/s) 
  • Swapped To Disk (blocks/s) 
  • Swapped In From Disk (blocks/s) 
  • Processes Waiting For Run (#) 
  • Processes In Sleep (#) 
  • Used Memory (bytes) 
  • Maximum Memory (bytes) 
  • Process CPU Time (%) 
  • Open File Descriptors 
  • Garbage Collection Count (#) 
  • Garbage Collection Time (ms) 
  • Thread Count (#) 
  • Throughput (/s) 
  • Queue Throughput (/s) 
  • Simultaneous (#) 
  • Queue Size (%) 

Example of Dashboard view in the Desktop: 

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System Statistics Dashboard in Desktop 

DROnline 

The Dashboard view in DROnline, contains the following standard graphs: 

  • Pico Heap Memory Usage (%) for the last 5 minutes. 
  • Pico Process CPU Usage (%) for the last 5 minutes. 
  • Aborted Workflows. 
  • Unreachable Picos. 
  • System Log, number of messages per category and time. 
  • Pico Response Time (ms). 
  • Workflow Uptime. 
  • Workflow Throughput. 

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Grafana 

Grafana can be used to create customized dashboards. Usage Engine includes a set of example dashboards to display System Statistics in a similar fashion to the Desktop view. Please refer to section 7.2 for more monitoring options using Grafana.