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Each successful login into a project creates a new task that contains the login process. The task is a process collective that represents a set of work over time. A task can also be viewed as a workload component. Each task is automatically assigned a task ID.
Figure 2-1 Project and Task Tree
All operations on process groups, such as signal delivery, are also supported on tasks. You can also bind a task to a processor set and set a scheduling priority and class for a task, which modifies all current and subsequent processes in the task.
A task is created whenever a project is joined. The following actions, commands, and functions create tasks:
You can create a finalized task by using one of the following methods. All further attempts to create new tasks will fail.
You can use the newtask command with the -F option.
You can set the task.final attribute on a project in the project naming service database. All tasks created in that project by setproject have the TASK_FINAL flag.
The extended accounting facility can provide accounting data for processes. The data is aggregated at the task level.