thanks for reminding, i just ran program on windose 7 and got: 10 vars: 0.0007 sec, 0.000068 sec/var 1000 vars: 0.0291 sec, 0.000029 sec/var 10000 vars: 0.7798 sec, 0.000078 sec/var 50000 vars: 35.5216 sec, 0.000710 sec/var the last one seems to indicate a n^2 effect, probably a linear lookup. however, creating 50000 vars is not what netcdf-3 was designed for. is this a real use case? john > Hi John, > I'd like to send you the test program regarding ticket GCF-381402 again. > I hope that you can find time to have a look, > why NetcdfFileWriteable.openExisting needs so much time for files with many > variables. > Thanks, > Bernd > > > address@hidden> wrote: > > > Hi Bernd: > > > > Can you send me the test program so that i can reproduce? thanks > > > > John > > > > > Hello NetCDF Java, > > > > > > I am testing the usage of NetCDF Java 4.3 to write NetCDF-3 files. > > > I have chosen NetCDF Java for the test because the Files will be written > > > from Windows and Linux. > > > > > > Theses Files contain many 3D-float-Arrays and need many updates during > > > their lifetime, both adding new arrays and updating the data of these. > > > It works well so far, but NetcdfFileWriteable.openExisting does not > > > scale well, please, see the results below. > > > > > > I have expected an open call without any overhead from my NetCDF > > > experience in Perl and R. > > > > > > What is the reason, is there a workaround ? > > > > > > Thanks, > > > Bernd > > > > > > NetcdfFileWriteable.openExisting: 2967 vars => 0.750 sec, 0.0003 > > sec/var > > > NetcdfFileWriteable.openExisting: 3625 vars => 1.484 sec, 0.0004 > > sec/var > > > NetcdfFileWriteable.openExisting: 15541 vars => 28.781 sec, 0.0019 > > sec/var > > > NetcdfFileWriteable.openExisting: 51457 vars => 310.478 sec, 0.0060 > > sec/var > > > > > > > > > > > > Ticket Details > > =================== > > Ticket ID: GCF-381402 > > Department: Support netCDF Java > > Priority: Normal > > Status: Open > > > > > > Ticket Details =================== Ticket ID: GCF-381402 Department: Support netCDF Java Priority: High Status: Open
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