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NOTICE: This version of the NSF Unidata web site (archive.unidata.ucar.edu) is no longer being updated.
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Can you do an ncdump with the -s option, so we can see the chunksizes? On Tue, Dec 13, 2016 at 10:54 AM, Chris Barker <chris.barker@xxxxxxxx> wrote: > if I understand the question, this is read times -- is this in fact with > exactly the same files? In which case the chunking is already set. > > less performant decompression?? > > sounds like the binary search is needed. > > Is EVERYTHING else the same? disk system, OS, etc? > > -CHB > > > On Tue, Dec 13, 2016 at 9:21 AM, Charlie Zender <zender@xxxxxxx> wrote: > >> Hello Simon, >> >> Since both files are netCDF4 compressed that >> means they use chunking. My wild guess is that >> different chunking defaults cause the observed >> change in dumping time. You can see the >> chunk sizes employed with ncdump -s or ncks --hdn, >> and you can play with the chunk sizes/policy >> with either. >> >> Charlie >> -- >> Charlie Zender, Earth System Sci. & Computer Sci. >> University of California, Irvine 949-891-2429 )'( >> >> >> _______________________________________________ >> NOTE: All exchanges posted to Unidata maintained email lists are >> recorded in the Unidata inquiry tracking system and made publicly >> available through the web. Users who post to any of the lists we >> maintain are reminded to remove any personal information that they >> do not want to be made public. >> >> >> netcdfgroup mailing list >> netcdfgroup@xxxxxxxxxxxxxxxx >> For list information or to unsubscribe, visit: >> http://www.unidata.ucar.edu/mailing_lists/ >> > > > > -- > > Christopher Barker, Ph.D. > Oceanographer > > Emergency Response Division > NOAA/NOS/OR&R (206) 526-6959 voice > 7600 Sand Point Way NE (206) 526-6329 fax > Seattle, WA 98115 (206) 526-6317 main reception > > Chris.Barker@xxxxxxxx > > _______________________________________________ > NOTE: All exchanges posted to Unidata maintained email lists are > recorded in the Unidata inquiry tracking system and made publicly > available through the web. Users who post to any of the lists we > maintain are reminded to remove any personal information that they > do not want to be made public. > > > netcdfgroup mailing list > netcdfgroup@xxxxxxxxxxxxxxxx > For list information or to unsubscribe, visit: > http://www.unidata.ucar.edu/mailing_lists/ >
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