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

[Robert Gray]

              Status: Open (was: Closed)

Underflow, Bus error
--------------------

           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: Open
            Priority: Default
                 SLA: NRAO E2E
      Template group: Default
             Created: 07 July 2018 02:30 PM
             Updated: 09 July 2018 08:21 PM
           Reply due: 11 July 2018 08:21 PM (2d 0h 0m)
      Resolution due: 04 April 2021 12:00 AM (999d 3h 39m)

Thanks for your comments on my "underflow/bus error" problem.

The two jobs were running on an AOC node, in "detached" screen sessions,
and stopped after 8 or 9 hours.  It's odd that they both stopped at the
same point in a long AIPS script, after creating 2048x2048x8192 cubes and
running SAD on each one for two time ranges, then creating a third cube but
not yet running SAD when things stopped... and five minutes apart.  Maybe
the local AOC AIPS was updated?

I suspected my script might have a problem, but after minor tweaks (that
should not change anything significantly) the two jobs are now running fine
- well past the point where they stopped before, so there appears to be no
problem now.

Best wishes,

Bob Gray

On Mon, Jul 9, 2018 at 12:49 PM, Eric Greisen  wrote:

> 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
>
>
> Ticket Details
> ------------------------------
> Ticket ID: 12307
> Department: AIPS Data Reduction
> Type: Issue
> Status: Closed
> Priority: Default
>
> Helpdesk: https://help.nrao.edu/index.php?
>



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