[parallel-netcdf] #42: MPI-agnostic "ncmpidiff" tool?

[Carl Ponder]

*On 6/12/19 12:09 PM, Carl Ponder via parallel-netcdf wrote:*
>
>     Wei-Keng -- do you have some explanation of the tool output?
>
*On 6/12/19 5:08 PM, Wei-keng Liao wrote:*
>
>     cdfdiff and ncmpidiff were designed to be more like unix command “diff”.
>     It reports whether the 2 NetCDF files are different and the “locations”
>     of differences.
>
>             ....
>
>     FYI. I updated cdfdiff to report the array indices of first
>     array element that is found different
>
>             ....
>
>     Command line option -b is for verbose mode, which also reports
>     what objects are the same.
>
Wei-keng -- I'm still trying to work with the sources that I ported 
before you made more of the "diff" changes.
This output here, is it only telling me that the arrays are not identical?

    DIFF: variable "ru" of type "NC_FLOAT" (-1)
    DIFF: variable "ru_save" of type "NC_FLOAT" (-1)
    DIFF: variable "rw" of type "NC_FLOAT" (1)
    DIFF: variable "rw_save" of type "NC_FLOAT" (-1)
    DIFF: variable "rtheta_p" of type "NC_FLOAT" (-1)
    DIFF: variable "rtheta_p_save" of type "NC_FLOAT" (1)
    DIFF: variable "rho_p" of type "NC_FLOAT" (1)
    DIFF: variable "rho_p_save" of type "NC_FLOAT" (-1)
    DIFF: variable "rho_zz_old_split" of type "NC_FLOAT" (1)
    DIFF: variable "ruAvg" of type "NC_FLOAT" (-1)
    DIFF: variable "ruAvg_split" of type "NC_FLOAT" (-1)
    DIFF: variable "wwAvg" of type "NC_FLOAT" (1)
    *DIFF: variable "wwAvg_split" of type "NC_FLOAT" (-1)*

I'm trying to figure out "how different" the two files are.
Can you tell me what the (1) & (-1) refer to?
If I use the "-b" option, I get the extra output about the sizings of 
the arrays, for example

    Variable "wwAvg_split":
         SAME: data type (float)
         SAME: number of dimensions (3)
         dimension 0:
             SAME: name (Time)
             SAME: length (2)
         dimension 1:
             SAME: name (nCells)
             SAME: length (40962)
         dimension 2:
             SAME: name (nVertLevelsP1)
             SAME: length (57)
         SAME: number of attributes (2)
         attribute "units":
             SAME: data type (char)
             SAME: length (16)
             SAME: attribute contents
         attribute "long_name":
             SAME: data type (char)
             SAME: length (51)
             SAME: attribute contents

but the difference in the content is still reported the same as above.
Thanks,

                       Carl





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