Re: addfiles

Hi Ed,

It looks like you are using an opendap-enabled version of NCL. If it
a version of NCL earlier than 5.2.0 then all NetCDF file access is
through the OPeNDAP NetCDF client library which limits the number of
simultaneous connections (open files) to 64. Given that there are a
small number of connections that are pre-allocated and not actually
available, it is not surprising that you are running out of
descriptors. The solution is to use the setfileoption procedure:

setfileoption("nc", "SuppressClose", False)

prior to your addfiles call. See the last paragraph of the addfiles
Description section at http://www.ncl.ucar.edu/Document/Functions/Built-in/addfiles.shtml
.

  -dave

On Apr 15, 2010, at 10:11 AM, Mary Haley wrote:

> Hi Ed,
>
> I don't think opening 58 files should be a problem, unless they are
> large and you run
> out of memory. I created a dummy set of 59 files and read them all
> fine with a
> single call to "addfiles".
>
> What version of NCL are you running (ncl -V)?
>
> Are the files on the web somewhere that I can access them? You can
> email
> me offline with this information.
>
> If you can't provide the files, then I will need more information,
> like how you
> are trying to open the files, (using "cat" or "join"), whether you
> are getting
> any other error messages, etc.
>
> Thanks,
>
> --Mary
>
>
>
> On Apr 14, 2010, at 9:55 PM, Yang Yang wrote:
>
>> Hello:
>>
>> I have 58 files and want to use addfiles to add them together.
>> However, NCL shows the follow information:
>>
>> add_connect: too many connects, cannot add another
>> ncinquire: ncid -1: NetCDF: Not a valid ID
>> add_connect: too many connects, cannot add another
>> ncinquire: ncid -1: NetCDF: Not a valid ID
>>
>> Can you tell me at most how many files I can use addfiles to add
>> them together? Thanks!
>>
>> Regards
>> Ed
>>
>>
>>
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Received on Thu Apr 15 10:59:19 2010