PP-946: On Cray a PTL script setting select specification on a job using set_attributes method makes the job fail to run

Interface:Job.__init__()
Visibility: Public
Change Control: Stable
Synopsis: Modification to add vntype value to each select chunk, when platform is Cray.
Details:

• If platform is an actual Cray cluster or Cray ALPS simulator:
  • If select statement is present in attrs:
    • If it does not contain vntype then assign vntype value as 'cray_compute' to each select chunk
    • If vntype present in select statement then do not modify it.
      
      

Interface:Job.set_attributes()
Visibility: Public
Change Control: Stable
Synopsis: Overriding parent set_attributes method with additional checks and modifications specific to Cray.
Details:

• Initialise default attributes.
• If platform is an actual Cray cluster or Cray ALPS simulator:
  • if 'Resource_List.vntype' is already set and select is defined inside attribute dictionary then:
    • Remove 'Resource_List.vntype' .
    • If vntype is not present in select then:
      
      • Add vntype to each select chunk.
      • Example: 
        Let suppose we have a select statement as below:
        select=1:ncpus=1+2:ncpus=2+1:ncpus=3
        Then modify it to:
        select=1:ncpus=1:vntype=cray_compute+2:ncpus=2:vntype=cray_compute+1:ncpus=3:vntype=cray_compute
    • If any of the select chunk has vntype specified then do not add vntype to select statement.
      • Example:
        select=1:ncpus=1:vntype=cray_compute+2:ncpus=2+1:ncpus=3
        Do not modify select statement in this case.
• Initialise custom attributes.