[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[netCDF #YFC-341618]: Memory leak in NetCDF

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: [netCDF #YFC-341618]: Memory leak in NetCDF
  • Date: Tue, 17 Nov 2015 10:56:45 -0700
Hi,

Thanks for the report; it should of course be possible to get rid of the memory 
leak, assuming we can identify it properly.  Can you tell me what version of 
the fortran and underlying C libraries you are using?

-Ward

> 
> Dear Unidata support,
> 
> We encountered a memory leak in a NetCDF interface for Fortran 90. The
> memory leak occurs when a there is an attribute that is a compound that
> contains a string. The memory is leaked when just opening and closing
> the file with nf90_open and nf90_close. Below, I will give an NCDUMP
> output of a small leaking NetCDF file.
> 
> We already contacted the HDF5 support and the memory leak does not occur
> when reading the same file with just the HDF5 interface.
> 
> For development, however, we prefer the nf90-interface above the
> h5-interface.  Is there a possibility to get rid of the memory leak with
> the nf90-interface?
> 
> NCDUMP output of a leaking NetCDF file:
> netcdf memory_leak {
> types:
> compound cmp {
> string content1 ;
> string content2 ;
> }; // cmp
> variables:
> float var ;
> cmp var:att = {"example", "X"} ;
> data:
> 
> var = 5.2 ;
> }
> 
> When opening and closing the file, 10 bytes of memory are leaked, equal
> to the sum of the string lengths (including termination characters).
> 
> Thanks in advance,
> Joost
> 
> 


Ticket Details
===================
Ticket ID: YFC-341618
Department: Support netCDF
Priority: Normal
Status: Closed