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

[Wei-keng Liao]

> Wei-Keng -- do all these tools work ok with the PNetCDF output-files?

Yes. They work for classic NetCDF files (i.e. CDF-1, 2, and 5) but
not the HDF5-based NetCDF4 files.

Wei-keng

> On Jun 12, 2019, at 5:38 PM, Carl Ponder <cponder at nvidia.com> wrote:
> 
> 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.
>> 
>> NCO’s ncbo does calculate the element-wise differences and
>> other statistics values, and save them to a new file.
>> 
>> I believe cprnc is similar, but reports the differences to stdout.
>> 
>> One advantage of cdfdiff is it does not need PnetCDF or NetCDF
>> library to compile or run.
>> 
>> FYI. I updated cdfdiff to report the array indices of first
>> array element that is found different. Here is an example output.
>> 
>>   cdfdiff tst_rec.nc1 tst_rec.nc2 ----
>>   DIFF: file format (CDF-1) != (CDF-2)
>>   DIFF: variable "rec_var" of type "NC_FLOAT" at element [1, 1]
>>   DIFF: variable "fix_var" of type "NC_FLOAT" at element [1, 2]
>>   Number of differences in header: 1
>>   Number of differences in variables: 2
>> 
>> Command line option -b is for verbose mode, which also reports
>> what objects are the same.
> Wei-Keng -- do all these tools work ok with the PNetCDF output-files?
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