[netcdfgroup] libnetcdf 4.0.0 and 4.1.1 read speed

Hi,

I have compiled grads with netcdf 4.1.1 lately. When I read a file created from netcdf 4.0.0 it takes more than 5 seconds to open. When I read the same file converted by ncks using netcdf 4.1.1, it opens almost instantaneously.

Deflation and chunking are the same in both files. Same 'grads' software opening each file (compiled with 4.1.1). Is there something in netcdf.4.1.1 library that makes the file being read much quicker than when files are created with netcdf 4.0.0 library?


Regards,
Denis


--
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Denis Nadeau, (ERT Inc.) Global Modeling and Assimilation Office (GMAO)
NASA Goddard Space Flight Center
Mailcode 610.5
8800 Greenbelt Road
Greenbelt, MD 20771
Email: denis.nadeau@xxxxxxxx
Phone: (301) 614-6828           Fax:   (301) 614-5304
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