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Roy, thanks for your response. I tried adding the call to nf90_redef after the open, as you suggest, and then re-write the attributes, but I still get the same error.
Alison On 3/7/2016 9:36 PM, Roy Mendelssohn - NOAA Federal wrote:
Hi Alison: I am not certain of this, but nc_create and nc_open behave differently. nc_create creates the file and puts you in define mode, nc_open does not put you in define mode. I don’t know what is magic about 30 attributes, perhaps that is what it takes to exceed the global attributes space because the history changes, but I wonder what happens if after the nc_open you call NF90_REDEF and then rewrite the global attributes. As I said, I could be wrong, but it would be easy enough to test. -RoyOn Mar 7, 2016, at 7:01 PM, Alison Walker <postings@xxxxxxxxxxxxxxxxxxxxxx> wrote: Hi netcdf folks, I'm getting this error when changing the values of global attributes in a netcdf4 file using the fortran interface: HDF5: infinite loop closing library D,G,A,S,T,F,FD,P,FD,P,FD,P,E,E,SL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL Here is a little test program that illustrates the problem. It first creates a netcdf file and writes some global attributes, then tries to write them again after closing and re-opening the file. Interestingly, if the number of attributes is less than 30, there is no error. If the number is 30, the error occurs. I'm using netcdf 4.3.0, netcdf fortran 4.2 and hdf5 1.8.16 on Linux x86_64. program tester use netcdf implicit none integer, parameter :: n_attrs = 30 integer :: iok, ncid, varid, i character*10 :: myattr ! Create the file and write global attrs iok = nf90_create('tester.nc',NF90_HDF5,ncid) print *,'create iok=',iok do i=1,n_attrs write(unit=myattr,fmt='(a6,i4.4)') 'myattr',i iok = nf90_put_att(ncid,NF90_GLOBAL,myattr,i) print *,i,' put iok=',iok enddo iok = nf90_close(ncid) print *,'close iok=',iok ! Open the file again and re-write global attrs iok = nf90_open('tester.nc',NF90_WRITE,ncid) print *,'open iok=',iok do i=1,n_attrs write(unit=myattr,fmt='(a6,i4.4)') 'myattr',i iok = nf90_put_att(ncid,NF90_GLOBAL,myattr,i) print *,i,' put iok=',iok enddo iok = nf90_close(ncid) print *,'close iok=',iok end program tester When I run this test program with 30 attributes I get this error result: create iok= 0 1 put iok= 0 2 put iok= 0 3 put iok= 0 4 put iok= 0 5 put iok= 0 6 put iok= 0 7 put iok= 0 8 put iok= 0 9 put iok= 0 10 put iok= 0 11 put iok= 0 12 put iok= 0 13 put iok= 0 14 put iok= 0 15 put iok= 0 16 put iok= 0 17 put iok= 0 18 put iok= 0 19 put iok= 0 20 put iok= 0 21 put iok= 0 22 put iok= 0 23 put iok= 0 24 put iok= 0 25 put iok= 0 26 put iok= 0 27 put iok= 0 28 put iok= 0 29 put iok= 0 30 put iok= 0 close iok= 0 open iok= 0 1 put iok= 0 2 put iok= 0 3 put iok= 0 4 put iok= 0 5 put iok= 0 6 put iok= 0 7 put iok= 0 8 put iok= 0 9 put iok= 0 10 put iok= 0 11 put iok= 0 12 put iok= 0 13 put iok= 0 14 put iok= 0 15 put iok= 0 16 put iok= 0 17 put iok= 0 18 put iok= 0 19 put iok= 0 20 put iok= 0 21 put iok= 0 22 put iok= 0 23 put iok= 0 24 put iok= 0 25 put iok= 0 26 put iok= 0 27 put iok= 0 28 put iok= 0 29 put iok= 0 30 put iok= 0 close iok= 0 HDF5: infinite loop closing library D,G,A,S,T,F,FD,P,FD,P,FD,P,E,E,SL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL,FL Can anyone help me to understand why this error is occurring when re-writing the attributes?is it a bug with netcdf/hdf or am I doing something wrong? Thanks, Alison _______________________________________________ netcdfgroup mailing list netcdfgroup@xxxxxxxxxxxxxxxx For list information or to unsubscribe, visit: http://www.unidata.ucar.edu/mailing_lists/********************** "The contents of this message do not reflect any position of the U.S. Government or NOAA." ********************** Roy Mendelssohn Supervisory Operations Research Analyst NOAA/NMFS Environmental Research Division Southwest Fisheries Science Center ***Note new address and phone*** 110 Shaffer Road Santa Cruz, CA 95060 Phone: (831)-420-3666 Fax: (831) 420-3980 e-mail: Roy.Mendelssohn@xxxxxxxx www: http://www.pfeg.noaa.gov/ "Old age and treachery will overcome youth and skill." "From those who have been given much, much will be expected" "the arc of the moral universe is long, but it bends toward justice" -MLK Jr.
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