PP-741: Need a default job specific to Cray in PTL

Interface: Job()
Visibility: Public
Change Control: Stable
Synopsis: Modifications to handle Cray specific default job parameters
Details:

• Introduction of new attribute called "Aprun_parameter" which user can specify through job attributes during job submission.
• If platform is an actual Cray cluster or Cray simulator then perform below:
• If "Aprun_parameter" set, then assign "Aprun_parameter" value to "Aprun_param", else assign default value as "-n 1 sleep 100" to "Aprun_param".
• If "Resource_List.select" not present in job attributes passed by the user, then assign default value as "1:ncpus=1:vntype=cray_compute" to "Resource_List.select".
• If vntype specified and value is "cray_compute" then call Job.cray_script() passing "Aprun_param" as a parameter to it, else run default sleep 100.

Interface: Job.create_script()
Visibility: Public
Change Control: Stable
Synopsis: Modifications to add cleanup for Cray job specific parameters.
Details:

• If platform is an actual Cray cluster or Cray simulator then perform below:
• Unset "Resource_List.select" attribute.
• If "Resource_List.vntype" is set, then unset it.
• If "script" is set, then make it None.

Interface: Job.cray_script()
Visibility: Public
Change Control: Stable
Synopsis: New method to create default Cray job script using aprun which accepts aprun parameters
Details:

• Call Job.create_script() by passing script body containing aprun with "Aprun_param" value.