Jobclasses
Jobclasses provide the following advantages:
- Simplifying the command line for job submission, which can prevent errors and omissions.
- Emulate the concept of queues, which is similar to the
processes of other batch processing systems. This queue emulation enables
additional behaviors such as:
- Automatic revocation of resources that have been grabbed by jobs in the jobclass but are not used
- Automatic warning and termination of jobs that are stuck: jobs that have been dispatched to a vovtasker but appear to be using no CPU time
A jobclass represents a collection of nc run options that are needed to run a type of jobs, such as VCS regression jobs.
Membership in a jobclass can be used to differentiate between jobs in preemption: preempt jobs in a regression jobclass to free up resources for jobs in an interactive jobclass.
If more than one -C option is given, the jobclasses are processed left-to-right as the command line is parsed. This method requires great care and planning.