Edward Hartnett

Do you know the version of HDF5? What I suspect is that it's 1.10.7, and I'm wondering if 1.12.0 has been tried, and if it will work.

OK, there is a new version of HDF5, 1.12.1. Does it work? ;-)

@GeorgeVandenberghe-NOAA it would be great to test whether HDF5-1.12.1 fixes your problem. Also, it would be great to test a build of the current master of the netcdf-c repo, and...

es, there is a CMake build of netcdf. However it should make no difference to your MPI problems...

I can confirm that there is no size limit, and NOAA produces some massive data files with many variables, using compression and parallel I/O. There is a test program which...

Can you send a small test program and demonstrates the problem?

OK, maybe you could close this issue and re-open it if this turns out to be related to netCDF.

This is great. I have been hearing users who want this feature for years. I wonder why you have to use the lock when doing read-only operations from the metadata....

Yes it is necessary when NC_CLASSIC_MODEL is used. It is not necessary for netCDF-4 files which were created without NC_CLASSIC_MODEL.

Well if you would just name the variable correctly in the first place, there would be no need for a rename! ;-) However, I would have thought this simple example...