| Re: ncdf + x-connection + many files = crazy. [message #74928 is a reply to message #74927] |
Tue, 08 February 2011 13:44   |
Michael Galloy
Messages: 1114
Registered: April 2006
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Senior Member |
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On 2/8/11 2:36 PM, Michael Galloy wrote:
> On 2/8/11 1:37 PM, Matt wrote:
>> Hey all,
>>
>> I've got a great riddle for you today. (Long story short, can you run
>> the test code included below to completion on your machine?) I've
>> already filed a bug report, but I want to see if other people can
>> reproduce these errors.
>>
>> I'm experiencing machine/version-dependent, non-deterministic behavior
>> that seems to present itself orthogonal to the triggering mechanism.
>> In other words, I've got a crazy-making problem.
>>
>> I experienced this in working code, but through patient debugging,
>> I've pared this down my until I've got a relatively small program that
>> demonstrates the problem behavior.
>>
>> The undesirable behavior is a NCDF_OPEN error (NC_ERROR=-31) after
>> some *random* number of open/close iterations on a netcdf file that
>> was created with IDL (or possibly a segfault core dump on other
>> machines.). The second feature is that I don't see this behavior
>> until I make an x-connection of some sort (window, /free, or even a
>> "device, depth=depth" will cause errors)
>>
>> Machine 1: (only has idl 7.0.1 64bit installed)
>> savoie@snow:~/tmp> uname -a
>> Linux snow 2.6.27.54-0.2-default #1 SMP 2010-10-19 18:40:07 +0200
>> x86_64 x86_64 x86_64 GNU/Linux
>>
>> Machine 2 (fails with 32 bit idl7.0.1& idl6.4):
>> savoie@snowblower:~/tmp> uname -a
>> Linux snowblower 2.6.34.7-0.5-default #1 SMP 2010-10-25 08:40:12 +0200
>> i686 i686 i386 GNux
>>
>>
>> All the code does is open and close a netcdf file, many, many times.
>> But after an x-connection (via "window, /free"), the code errors out
>> at a different spot in the iteration.
>>
>>
>> Below is the output I get on the problem machines and below that, the
>> source code for you to try at home. For extra credit, modify the code
>> to open a netcdf file created with a different program than IDL, NCO
>> for example.
>>
>>
>> --OUTPUT--------------------------------------
>> savoie@snow:~/tmp> idl70
>> IDL Version 7.0.1 (linux x86_64 m64). (c) 2008, ITT Visual Information
>> Solutions
>> Installation number: 100-431.
>> Licensed for use by: University of Colorado
>>
>> IDL> .run ./crash_ncdf.pro
>> % Compiled module: CREATE_HAND_SAMPLE.
>> % Compiled module: CRASH_NCDF.
>> IDL> crash_ncdf
>> % Loaded DLM: NCDF.
>> Successfully completed first iterations
>> i = 143017
>> ncdf_fid = 5
>> % CRASH_NCDF: NCDF_OPEN: Unable to open the file "/projects/NRTSI-G/
>> tmp_crashing_ncdf/sample_h
>> and.nc".
>> (NC_ERROR=-31)
>> % Execution halted at: CRASH_NCDF 44 /homes/snowblower/savoie/
>> tmp/crash_ncdf.pro
>> % $MAIN$
>
> I made it through OK with IDL 8.0.1 (and netCDF 4.1 instead of the 3.6.2
> in IDL 7.0):
>
> IDL> crash_ncdf
> % Loaded DLM: NCDF.
> Successfully completed first iterations
> Successfully completed second iterations
> IDL> print, !version
> { x86_64 darwin unix Mac OS X 8.0.1 Oct 5 2010 64 64}
>
> Mike
> --
> www.michaelgalloy.com
> Research Mathematician
> Tech-X Corporation
>
Actually, I'm OK on 7.0 also.
IDL> crash_ncdf
% Compiled module: CRASH_NCDF.
% Loaded DLM: NCDF.
Successfully completed first iterations
Successfully completed second iterations
IDL> print, !version
{ i386 darwin unix Mac OS X 7.0 Oct 25 2007 32 64}
IDL> help, 'ncdf', /dlm
** NCDF - IDL NetCDF support (loaded)
Version: 3.6.2, Build Date: OCT 25 2007, Source: ITT Visual
Information Solutions
Path: /Applications/itt/idl70/bin/bin.darwin.i386/idl_netcdf.so
Mike
--
www.michaelgalloy.com
Research Mathematician
Tech-X Corporation
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