[MITgcm-devel] mnc and "global" files

[Ed Hill]

On Wed, 2005-09-07 at 21:51 -0400, Baylor Fox-Kemper wrote:
> Ed,
>    While you're at it, why don't you put a p in front of the processor 
> number?
> 
> >> pickup.0000001440.p0000.f000001.nc
> >> pickup.0000001440.p0001.f000001.nc
> 
> Cheers,
>    -Baylor

Hi Baylor,

No!  There is no processor or sequence number!  Just a model iteration
number and either a face index or a tile index.

I'm sorry if I did a poor job of explaining that in the original email.
I tried to point out that faces and tiles are separate.  If it helps,
heres an ASCII graphic of what I'm talking about:

Here are six cube faces:

 +=======+=======+=======+=======+=======+=======+
 |       |       |       |       |       |       |
 |  F1   |  F2   |  F3   |  F4   |  F5   | F6    |
 |       |       |       |       |       |       |
 +=======+=======+=======+=======+=======+=======+

which result in six per-face files for one BASENAME:

  state.0000000000.f000001.nc
  ...
  state.0000000000.f000006.nc

and heres exactly the same grid that has been divided up into four tiles
per face:

 +=======+=======+=======+=======+=======+=======+
 |T1 |T2 |T5 |T6 |T9 |T10|T13|T14|T17|T18|T21|T22|
 |---|---|---|---|---|---|---|---|---|---|---|---|
 |T3 |T4 |T7 |T8 |T11|T12|T15|T16|T19|T20|T23|T24|
 +=======+=======+=======+=======+=======+=======+

which results in 24 per-tile files in the format:

  state.0000000000.t000001.nc
  ...
  state.0000000000.t000024.nc

or we could split it up into different numbers of tiles per face such as
this odd but totally do-able decomposition:

 +=======+=======+=======+=======+=======+=======+
 |T1 |T2 |   |   |       |  T8   |       |T11|T12|
 |---|---|T5 |T6 |  T7   |-------|  T10  |---|---|
 |T3 |T4 |   |   |       |  T9   |       |T13|T14|
 +=======+=======+=======+=======+=======+=======+

which results in 14 per-tile files:

  state.0000000000.t000001.nc
  ...
  state.0000000000.t000014.nc

Ed

-- 
Edward H. Hill III, PhD
office:  MIT Dept. of EAPS;  Rm 54-1424;  77 Massachusetts Ave.
             Cambridge, MA 02139-4307
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