[MITgcm-support] RE: conversion from local tile index to global new I/O format index

[Ichiro Fukumori]

Do myXGlobalLo myYGlobalLo give the same thing?   -- Ichiro

At 03:42 PM 3/30/2004 -0500, Chris Hill wrote:
>Yes that is the loop.
>For a 510x510 cube that will return global i {1:510*6} and global j {1:510}.
>
>
>Chris
>
> > -----Original Message-----
> > From: Ichiro Fukumori [mailto:if at pacific.jpl.nasa.gov]
> > Sent: Tuesday, March 30, 2004 3:33 PM
> > To: 'Andrew Eichmann'; Dimitris Menemenlis
> > Cc: Chris Hill
> > Subject: Re: conversion from local tile index to global new
> > I/O format index
> >
> > Hi Andrew,
> >
> > Could you give me the exact do loop to get the global i (1 to
> > Nx) and global j (1 to Ny) index at point, (i,j,bi,bj) within
> > a tile?  Is it
> >
> > i_global_io_index = exch2_txglobalo(W2_myTileList(bi))+i-1
> > j_global_io_index = exch2_tyglobalo(W2_myTileList(bi))+j-1
> >
> > Thanks,
> > Ichiro
> >
> > At 02:14 PM 3/30/2004 -0500, 'Andrew Eichmann' wrote:
> > >* Dimitris Menemenlis <menemenlis at jpl.nasa.gov> wrote on
> > Tue, Mar 30,
> > >2004 at 10:01:37AM -0800
> > > >
> > > > Chris, Andy,
> > > >
> > > > >          i_global_io_index =
> > exch_tx_globallo(W2_myTileList(bi))+i-1
> > > > >          j_global_io_index =
> > > > > exch_ty_globallo(W2_myTileList(bi))+j-1
> > > >
> > > > is not exactly what we need.  Two problems, the first is that the
> > > > exch_tx_globallo and exch_ty_globallo variables do not exist.  I
> > > > assume you
> > >
> > >They're exch2_txglobalo and exch2_tyglobalo.  There's a
> > mismatch in the
> > >comments that we should clean up.
> > >
> > > > mean exch2.  The second problem is that these variables seem to
> > > > point
> > > to face
> > > > corners, not tile corners.  So some more tile gymnastics must be
> > > > needed
> > > to get
> > >
> > >They should point to the tile corners within the face.  That, plus
> > >exch2_mydnx, exch2_mydny (which I just realised I haven't
> > documented -
> > >these are dimensions of the faces, indexed to the tile), and
> > >exch2_myFace should get you what you need.
> > >
> > > > P.P.S.  Anybody running the mitgcm using cygwin?
> > >
> > >Would this be for performance tuning? ;-)
> > >
> > >-A
> >
> > ===============================================================
> > Ichiro Fukumori               | Jet Propulsion Laboratory
> > e-mail: fukumori at jpl.nasa.gov | Mail Stop 300-323
> > phone: +1 (818) 354-6965      | 4800 Oak Grove Drive
> > fax: +1 (818) 393-6720        | Pasadena, California 91109, U.S.A.
> > ===============================================================
> >
>
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===============================================================
Ichiro Fukumori               | Jet Propulsion Laboratory
e-mail: fukumori at jpl.nasa.gov | Mail Stop 300-323
phone: +1 (818) 354-6965      | 4800 Oak Grove Drive
fax: +1 (818) 393-6720        | Pasadena, California 91109, U.S.A.
===============================================================