[daip] [!17235]: AIPS - AIPS NI (nice) value changed to 16 when using parseltongue

[Hao Ding]

Hao Ding updated #17235
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AIPS NI (nice) value changed to 16 when using parseltongue
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           Ticket ID: 17235
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/17235
                Name: Hao Ding
       Email address: haoding at swin.edu.au
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): -- Unassigned --
                Type: Issue
              Status: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 29 October 2020 09:00 AM
             Updated: 29 October 2020 09:00 AM
           Reply due: 02 November 2020 09:00 AM (4d 0h 0m)
      Resolution due: 26 July 2023 12:00 AM (999d 15h 0m)

Dear AIPS team,

I have been using parseltongue to invoke AIPS and DIFMAP to do VLBI data reduction on a supercomputer. It was revealed recently with the TOP command that the NI (nice) value changed to 16 for all AIPS tasks, which remarkably downweighted the priority. In contrast, when I do not use parseltongue to call AIPS, the NI value of AIPS tasks is normal (0). However, I don't think parseltongue is fully responsible for this NI change, because the NI value of DIFMAP tasks invoked by parseltongue remains 0. This issue persists when I install the latest version of AIPS and reinstall parseltongue. I don't know anyone else having the same issue. Is there anything that you are aware of can possibly trigger this magical NI change?

Thanks,
Hao from Swinburne University


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