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Re: 20050104:netCDF C++ - Memory usage

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  • Subject: Re: 20050104:netCDF C++ - Memory usage
  • Date: Tue, 04 Jan 2005 14:36:38 -0700
>To: address@hidden
>From: "Le Ru" <address@hidden>
>Subject: netCDF C++ - Memory usage
>Organization: Capgemini
>Keywords: 200501041620.j04GKmmE018531

Hi Pascal,

> Institution: Capgemini
> Package Version: 3.5
> Operating System: Linux
> Hardware Information: .
> Inquiry: I copy data between two NetCDF files using a single buffer (about 5 
> Mo).
> 
> This part of code is called several times.
> When I watch the amount of memory used during this process, using
> the free command, I can see that an unexpected amount of memory is
> still used afer the copy is completed.
> 
> Rational Purify tool doesn\'t detect any memory leak at the end of
> the process.
> 
> Is this a known problem ?

The documentation for version 3.5.0 didn't make clear that the caller
is responsible for deleting the memory space returned by
Variable::values() method when no longer needed.

There was also a memory leak in version 3.5.0, fixed in 3.5.1 and
later releases, to make sure NcVar::cur_rec[] gets deleted in the
NcVar destructor.

I don't know of any memory leak problems in the current version 3.6.0.
If you have a small test program that demonstrates a memory problem in
the current version, we would appreciate getting it.

--Russ

_____________________________________________________________________

Russ Rew                                         UCAR Unidata Program
address@hidden          http://www.unidata.ucar.edu/staff/russ