Job array (or array jobs)
=============================

A job array is a collection of similiar independent jobs (called the job array "tasks") which are identified by sequential integers (or indices), the job array task IDs.

- The entire job array (containing multiple tasks) has one job ID
- Each task has a task ID


The key difference between a job array and regular (non-job array) job is the ``-t`` parameter, which specifies the range of the job task indices.


Contiguous indices, e.g. ::

    #$ -t 1-100

will generate indices from 1 to 100.

With step size, e.g. ::

    #$ -t 1-100:10

will generate indices 1, 11, 21, ..., 91.


Each job array task can has its own input and output files, typically indexed by the task IDs. For example, task 1 reads from input 1 and produces output 1. Task 2 reads from input 2 and produces output 2. And so on.


.. Note::

     0 is not a valid task ID, i.e. the starting index must be 1 or greater.

.. toctree::
    :maxdepth: 1

    ex1.md 
    ex2.md 

    quiz1.md