Are you sure you closed all opened objects (groups, datasets, etc...) before you closed the file? The error you get suggests that you have not. The MPIO driver sets the default file close degree to SEMI, meaning that if object are open, the file close will fail. All other VFL drivers set the default close degree to WEAK, which delays the file close allowing you to have some open objects when you call file close. This explains that in the first case, you program succeeds but fails in the second case.
For more information, look here: http://www.hdfgroup.org/HDF5/doc/RM/RM_H5P.html#Property-SetFcloseDegree Thanks, Mohamad From: Hdf-forum [mailto:[email protected]] On Behalf Of Matthieu Dorier Sent: Sunday, January 19, 2014 4:53 AM To: HDF Forum Subject: [Hdf-forum] Problem with property lists Hello, I'm trying to make a fortran code use the MPI-I/O driver of HDF5. The initial code (which doesn't have any problem) looks like the following: call h5open_f (ierror) call h5fcreate_f (filename,H5F_ACC_TRUNC_F,file_id,ierror) ! creating groups, datasets, etc. then writing to them and closing them call h5fclose_f (file_id,ierror) call h5close_f (ierror) I changed it to the following: call h5open_f (ierror) call h5pcreate_f(H5P_FILE_ACCESS_F,access_prop_id,ierror) call h5pcreate_f(H5P_FILE_CREATE_F,create_prop_id,ierror) call h5pset_fapl_mpio_f(access_prop_id,MPI_COMM_WORLD,MPI_INFO_NULL,ierror) call h5fcreate_f(filename,H5F_ACC_TRUNC_F,file_id,ierror,create_prop_id,access_prop_id) ! creating groups, datasets, etc. then writing to them and closing them call h5fclose_f (file_id,ierror) call h5pclose_f (create_prop_id,ierror) call h5pclose_f (access_prop_id,ierror) call h5close_f (ierror) and now I have the following error from HDF5: HDF5-DIAG: Error detected in HDF5 (1.8.12) MPI-process 0: #000: H5F.c line 2061 in H5Fclose(): decrementing file ID failed major: Object atom minor: Unable to close file #001: H5I.c line 1479 in H5I_dec_app_ref(): can't decrement ID ref count major: Object atom minor: Unable to decrement reference count #002: H5F.c line 1830 in H5F_close(): can't close file, there are objects still open major: File accessibilty minor: Unable to close file I tried to close the property lists before the file, after the file, I tried not to close them, I always get this error. Any idea where this comes from? Thank you, Matthieu Dorier PhD student at ENS Rennes http://people.irisa.fr/Matthieu.Dorier
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