Hi Karsten,
I also bumped into this problem (although I didn’t get any error message). If
one of your dimension is unlimited then all parallel IO must be collective.
Cheers,
John
From: Karsten Bolding [mailto:karsten@xxxxxxxxxxxxxxxxxxxx]
Sent: 10 September 2014 11:26
To: netcdfgroup@xxxxxxxxxxxxxxxx
Subject: [netcdfgroup] nf90_var_par_access - independent or collective
Hello
Compiling like:
mpif90 simple_xy_par_wr2.f90 -I/opt/netcdff-4.4.1-gfortran-4.8-par/include/
/opt/netcdff-4.4.1-gfortran-4.8-par/lib/libnetcdff.a
/opt/netcdf-4.3.3-rc1-gcc-4.8-par/lib/libnetcdf.a
/opt/hdf5-1.8.13-gcc-4.8-par/lib/libhdf5_hl.a
/opt/hdf5-1.8.13-gcc-4.8-par/lib/libhdf5.a -ldl -lm -lz -lcurl
I can run:
mpiexec -n 10 ./a.out
with collective it works but with independent I get:
NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation. Use
nc_va
NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation. Use
nc_va
NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation. Use
nc_va
STOP 2
NetCDF: Attempt to extend dataset during NC_INDEPENDENT I/O operation. Use
nc_va
any ideas?
Karsten
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