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[netCDF #FSP-229232]: netcdf-4.1.1 segmentation fault

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  • Subject: [netCDF #FSP-229232]: netcdf-4.1.1 segmentation fault
  • Date: Tue, 30 Nov 2010 09:56:20 -0700
> Dear All,
> 
> I would like to draw your attention on a problem occurred using the
> netcdf-4.1.1 library (with hdf5-1.8.4_patch1) in order to write netCDF-4
> files. I've tried to sketch the problem statement in the C++ test program
> attached to this e-mail: the test creates a netcdf file (test_file.nc)
> and defines an unlimited dimension "rec" and 50 variables of type DOUBLE;
> then it tries to write 10^5 double values in each variable one at a time
> using nc_put_var_1_double() function. Monitoring the memory used by the
> test you find out that the memory consumption steadily increases until
> the program crashes when 3GB of memory are used (which is about the 37%
> of the available memory on my machine). The  setting and tuning of the
> variables' chunking seem to be irrelevant: the behavior doesn't change.
> Yet, the problem disappears if you don't declare the dimension "rec" as
> unlimited: setting "rec" dimension size to 10^5, a Netcdf file of about
> 40MB (10^5 x 50 x 8 bytes) is correctly generated.  It seems that a memory
> leak occurs when using unlimited dimensions and one by one value writing.
> Do you already know this problem?
> 
> I'm looking forward to hearing from you soon.
> Thanks in advance.
> 
> Best regards,
> Marica Antonacci
> 

Howdy Marica!

I believe this is fixed in the daily snapshot release:

ftp://ftp.unidata.ucar.edu/pub/netcdf/snapshot/netcdf-4-daily.tar.gz.

Can you get it and try it?

Thanks,

Ed

Ticket Details
===================
Ticket ID: FSP-229232
Department: Support netCDF
Priority: Normal
Status: Closed