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[netCDF #AHZ-822837]: [netcdfgroup] performance issues


> > Would it be convenient for you to compile the same model against the 
> > previous
> > netCDF version 4.1.3 for comparison of times with the 4.2 release candidate?
> I've already done that with similar results.
> NetCDF version: 4.2-rc1 of Jan 18 2012 07:56:30 $
> real  0m42.843s
> user  0m3.680s
> sys   0m0.130s
> NetCDF version: "3.6.3" of Jan 18 2012 08:53:30 $
> real  0m1.788s
> user  0m1.770s
> sys   0m0.000s
> NetCDF version: 4.1.3 of Dec  9 2011 10:42:04 $
> real  0m42.423s
> user  0m3.820s
> sys   0m0.080s
> version information printed from executable.

Thanks, that's good to know.  It tells us two things: 

  - we haven't significantly slowed things down with changes from 4.1.3 to 4.2, 
  - the performance problem you're seeing is specific to your model, as others
    haven't reported such a problem with version 4.1.x

I'll have to stufy your perf output, but in the meantime, could you provide the 
output of

  ncdump -s -h 

for your file *using the 4.2 version of ncdump* rather than the older installed 
you apparently used, which showed no information about chunk sizes.



Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu

Ticket Details
Ticket ID: AHZ-822837
Department: Support netCDF
Priority: Normal
Status: Closed

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