[Mitgcm-support] Re: Why are some variables in COMMON when they are only used once

[mitgcm-support at dev.mitgcm.org]

Is this related to the fact that the bi,bj loops
appear OUTSIDE of calc_exact_eta?
Otherwise, the block in forward_step

        DO bj=myByLo(myThid),myByHi(myThid)
         DO bi=myBxLo(myThid),myBxHi(myThid)
           CALL CALC_EXACT_ETA( .FALSE., bi,bj, uVel,vVel,
     I                          startTime, nIter0, myThid )
         ENDDO
        ENDDO

appears a bit strange
(I would have put the bi,bj loops inside CALC_EXACT_ETA).
If they are inside, I may be able to fix the TAF problem
by some HPF directives without having to remove the "common".

P.

Chris Hill wrote:
> 
> Common blocks are used to force otherwise local variables
> into global storage. This allows multi-threaded exchange operations
> to work.
> 
> If you don't want multi-threaded parallelism then you can remove the
> common block.
> 
> Patrick Heimbach wrote:
> >
> > Jean-Michel,
> >
> > in calc_exact_eta the field hDivFlow is declared
> > in a common block.
> > However, that common block is - I think-  nowhere else needed.
> > Furthermore, TAF gets totally confused by it, I have no clue, why.
> > Can I just remove the common block?
> >
> > P.
> > --
> > _/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
> >
> > Patrick Heimbach ........................ FON: +1/617/253-5259
> > Massachusetts Institute of Technology ... FAX: +1/617/253-4464
> > EAPS, Room 54-1518 ...........................................
> > 77 Massachusetts Avenue .............. mailto:heimbach at mit.edu
> > Cambridge MA 02139, U.S.A. ..... http://www.mit.edu/~heimbach/

-- 
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Patrick Heimbach ........................ FON: +1/617/253-5259
Massachusetts Institute of Technology ... FAX: +1/617/253-4464 
EAPS, Room 54-1518 ...........................................
77 Massachusetts Avenue .............. mailto:heimbach at mit.edu
Cambridge MA 02139, U.S.A. ..... http://www.mit.edu/~heimbach/