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

[Carl Ponder]

*On 6/11/19 1:05 PM, Wei-keng Liao wrote:*
>
>     I have implemented a serial version of ncmpidiff, named "cdfdiff”.
>     It is available in PnetCDF repo and will be added to the next release.
>
>         https://github.com/Parallel-NetCDF/PnetCDF/tree/master/src/utils/ncmpidiff
>
>     Command “make” or “make cdfdiff” will create it. Note it only
>     compares the classic NetCDF files.
>
Wei-Keng -- do you have some explanation of the tool output?
I have this, for example:

    DIFF: global attribute "history" length (31) != (30)
    DIFF: global attribute "config_run_duration" of type "NC_CHAR" (3)
    DIFF: global attribute "file_id" of type "NC_CHAR" (3)
    DIFF: variable "ru" of type "NC_FLOAT" (158)
    DIFF: variable "ru_save" of type "NC_FLOAT" (-185)
    DIFF: variable "rw" of type "NC_FLOAT" (-91)
    DIFF: variable "rw_save" of type "NC_FLOAT" (101)
    DIFF: variable "rtheta_p" of type "NC_FLOAT" (77)
    DIFF: variable "rtheta_p_save" of type "NC_FLOAT" (-47)
    DIFF: variable "rho_p" of type "NC_FLOAT" (42)
    DIFF: variable "rho_p_save" of type "NC_FLOAT" (-35)
    DIFF: variable "rho_zz_old_split" of type "NC_FLOAT" (83)
    DIFF: variable "ruAvg" of type "NC_FLOAT" (-151)
    DIFF: variable "ruAvg_split" of type "NC_FLOAT" (15)
    DIFF: variable "wwAvg" of type "NC_FLOAT" (-93)
    DIFF: variable "wwAvg_split" of type "NC_FLOAT" (-70)
    Number of differences in header 3
    Number of differences in variables 13

Most of these are arrays, is this reporting the largest absolute 
difference across all the elements?

         -- Carl



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