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20010510: netcdf error -31

Xiaohong Xu,

For backward compatiblity reasons, the netCDF 2.4 error number of -31
could indicate either a problem with the underlying operating system
or that too many netCDF files are open.  I suggest that you check the
system error code when you obtain the netCDF error.

Regards,
Steve Emmerson   <http://www.unidata.ucar.edu>

> To: address@hidden
> From: Xiaohong Xu <address@hidden>
> Subject: netcdf error
> Organization: UCAR/Unidata
> Keywords: 200105101836.f4AIaAp08380
> 
> Dear Sir/Madam, 
> I ran into a netcdf I/O error lately when outputing results(fortran).
> There are 4 output files, each opened at begining of the simulation, then
> at the end of each hour, output data to these 4 data files. The largest one
> is for concentration, the dimension is 78x78x21x99.  The other three files
> are much smaller in dimension. At the end of 42 hour, the simulation would
> crash when writing to the concentration file. The error code is -31, and
> according to netcdf.inc, have too many netcdf files open. I did some test
> to rule out the problem of the model itself.  My calculation suggested that
> by the time the error occured, the models has called wrvars (NCVPT)more
> than 4100 times.  I checked a few variables in netcdf.inc and list them below:
> nf-share = 2048
> nclink=32768
> MAXNCOP = 32, max. number of files
> However I don't know where to check the meaning of there variable.  
> Can you help me on the possible reason of the problem and how to fix it,
> please. The related log file lines are listed for your reference too, 
> 
>      >>> WARNING in subroutine WRVARS <<<
>      Error writing variable NO2              to file CTM_CONC_1
>      netCDF error number  -31
> 
> 
>  IOAPI file ID   4
>  netCDF ID       7
>  variable        2
>  dims array      1  1  1  43  0
>  delts array     78  78  21  1  0
> 
> 
>      Error writing NO2              to CTM_CONC_1       for  2000164:180000
> 
>                                                       
> Thanks a lot.
> 
> Xiaohong Xu
> 734 936-0517 (phone)
> 734 764-5137 (fax)
> University of Michigan
> 1214 Space Research Bld.
> 2455 Hayward
> Ann Arbor, MI 48109-2143
> 
> 
> ------- End of Forwarded Message