Standard Performance Metrics

To access to the existing default performance estimation routines (as described in Chapter 10), the following functions are available to facilitate the construction of custom performance estimation functions:

• The time elapsed since the last execution (to enable the ``least recently used'' scheduler) is stored in an estimation metric vector by calling

  
      int diet_estimate_lastexec(estVector_t ev, 
  
  const diet_profile_t* const profilePtr);  
  

  with an appropriate value for ev and the profilePtr corresponding to the current DIET request.
• The number of waiting jobs when using the maximum concurrent jobs limit is stored in an estimation metric vector by calling

  
      int diet_estimate_waiting_jobs(estVector_t ev);  
  

• CoRI allows to access in an easy way to basic performance prediction. See Chapter 10.2 to know more about the use of it.

In the future, we plan to expand the suite of default estimation metrics to include dynamic internal DIET system state information (e.g., queue lengths).