9.2.4. DIRAC jobs: definitions

Some definitions for DIRAC jobs:

• payload or workflow: the executed code. A payload describes how to run one or more application step.
• payload executor: a script that runs the payload (e.g. dirac-jobexec)
• JDL: a container of payload requirements
• DIRAC job: a JDL to which it is assigned a unique identifier inside the DIRAC WMS
• JobWrapper: a software module for running a DIRACJob in a controlled way
• multi-processor payload [job]: a payload application that will try to use multiple cores on the same node
• computing slot: resource allocated by a provider where a pilot wrapper is running (batch job)
• multi-processor [computing] slot: allocated resource has more than one OS CPU core available in the same slot as opposed to a single-processor [computing] slot

Applications properties are reflected in payload properties.

The DIRAC APIs can be used to create and submit jobs. Specifically, objects of type Job represents a job. The API class Dirac and more specifically the call to submitJob submits jobs to the DIRAC WMS.