Re: [netcdf-hdf] 'Too many open files' What causes this?

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There is a sysconf call that can give you the maximum number of open files supported on the current system. The call is: "sysconf(_SC_OPEN_MAX)" which will return either the maximum number of simultaneously open files (including stdout, stderr, and stdin) or if it returns -1, then the maximum is unlimited. 

My guess is that your OSX is limiting you to 256.

--Greg

On 9/7/10 9:53 AM, Ted Mansell wrote:

Howdy,

I'm using netcdf4.1.2-beta1, and I get the error "Too many open files"
upon trying to open the 254th file (out of 616).  This is on OS X
(10.5), and the first time I've pushed it that far on this platform.
On an ia64 machine, however, I've been able to open all 616 files (the
same files I'm trying to open under OS X; not sure which version of
netcdf4 I'm using on the ia64 system).  Is there a setting somewhere
for the max number of open files?  Is this an error that comes from
HDF5?

I've looked through the online docs and even searched through netcdf
code, and I don't even see where the error value is even used (only
checked for in error.c).  The application is compiled with 64-bit
memory access, and does not appear to be running out of memory (less
than 1.5GB when it quits).

Thanks for any help...

By the way, the netcdf.inc file defines ncenfile = -31, but it is
NC_ENFILE = -34 in the C code.

-- Ted

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