[daip] [!12307]: AIPS - Underflow, Bus error

[Eric Greisen]

Eric Greisen updated #12307
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       Staff (Owner): Eric Greisen (was: -- Unassigned --)
              Status: Closed (was: Open)
           Reply due: - Cleared - (was: 11 July 2018 12:00 AM)

Underflow, Bus error
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           Ticket ID: 12307
                 URL: https://help.nrao.edu/staff/index.php?/Tickets/Ticket/View/12307
                Name: Robert Gray
       Email address: roberthansengray at gmail.com
             Creator: User
          Department: AIPS Data Reduction
       Staff (Owner): Eric Greisen
                Type: Issue
              Status: Closed
            Priority: Default
      Template group: Default
             Created: 07 July 2018 02:30 PM
             Updated: 09 July 2018 05:49 PM

The UNDERFLOW message is normal these days due to the gfortran compiler.  It means that a computed value microscopically close to zero was set zero.  It is totally normal and should be ignored.The bus error from AIPS.EXE suggests that you started these aips tasks some time previously and while they were running you updated your installation with a MNJ.  Normally AIPS.EXE does not change but in fact I made several changes that affected that load module.  Note that AIPS.EXE can keep on running until it encounters a section of the load module that has changed.  Then a bus error ensues.  If this keeps happening let me know.Eric Greisen


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