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Process classes limit the number of jobs that are running concurrently.

Process classes specify remote JobScheduler Workload instances and Agents on which jobs should be executed.

Use of Process Classes

A process class is an object that can be assigned to a job. It has a number of functions.

Use for Resource Contention Management

  • To limit the number of processes that can start in parallel.
    • If that limit were reached then an additional job would be caused to wait for the process class to become available.
    • Jobs waiting for a process class to become available will not consume system resources such as CPU or memory.
  • Example
    • Process class for Resource Contention Management  Expand source

Use with a JobScheduler Master for Remote Execution 

  • To run a job on a remote JobScheduler Workload instance or Agent for remote execution
    • Process classes can reference remote JobScheduler instances for execution of a job:
      • At the time of job execution the initiating JobScheduler hands over the job configuration to the remote JobScheduler instance.
      • After completion of the job the initiating JobScheduler regains full control and will continue execution e.g. with the next job in a job chain.
      • The connection to the remote JobScheduler instance makes use of TCP, i.e. the remote instance is configured by host:port.
  • Example
    • Process class for Remote Execution with a Master  Expand source

Use with Agents and High Availability

  • Process classes can be used as a means to implement high availability:
    • A sequence of JobScheduler Agents can be specified that would be checked for availability by the initiating JobScheduler instance at run-time.
    • If a JobScheduler Agent were not avaiable then the next Agent would be selected for execution of a job. The configuration is made from the <remote_schedulers select="first|next"/> attribute.
    • The connection to an Agent makes use of the HTTP or HTTPS protocol; i.e. the remote instance is configured by http://host:port or https://host:port .
  • Example
    • Agent Passive Cluster configuration

      Process class for fixed-priority scheduling with Agents  Expand source
    • Agent Active Cluster configuration

      Process class for round-robin scheduling with Agents  Expand source

See also